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Nippon Steel Corporation patents


Recent patent applications related to Nippon Steel Corporation. Nippon Steel Corporation is listed as an Agent/Assignee. Note: Nippon Steel Corporation may have other listings under different names/spellings. We're not affiliated with Nippon Steel Corporation, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "N" | Nippon Steel Corporation-related inventors


Organic electroluminescent element

Provided is an organic electroluminescent device having high efficiency and high driving stability while being driven at a low voltage. The organic electroluminescent device is an organic electroluminescent device including a light-emitting layer between an anode and a cathode opposite to each other, in which: the light-emitting layer contains two kinds of host materials and a light-emitting dopant; and a first host material (h1) out of the two kinds of host materials is an indolocarbazole-based compound having one or two indolocarbazole rings, and a second host material (h2) out of the materials is a host material selected from carbazole-based compounds each represented by the general formula (3), the compounds each having a structure in which two carbazole rings are bonded through a six-membered aromatic ring.. ... Nippon Steel Corporation

Method for manufacturing silicon carbide single crystal

The present invention provides a method of manufacturing by the sublimation-recrystallization method more accurately detecting a thermal state of a starting material in a crucible and enabling control of the growth conditions while manufacturing an sic single crystal. The method obtains the high frequency current to be supplied through the induction coil by a converter for converting ac current to dc current and an inverter means for converting the dc current output from the converter to a high frequency to obtain a high frequency current, obtains a grasp, in advance, of a relationship between a variation over time of a dc equivalent resistivity (dcv/dci), calculated from a dc voltage value (dcv) and dc current value (dci) converted by the converter at the time of growth of the silicon carbide single crystal, and a density of micropipes formed in the grown silicon carbide single crystal, and adjusts at least one of the dcv or dci at the converter based on the relationship of the dc equivalent resistivity and micropipe density grasped in advance.. ... Nippon Steel Corporation

Nitrided steel part and method of production of same

A nitrided steel part excellent in bending straightening ability and bending fatigue characteristic enabling reduction of size and decrease of weight of parts or enabling demand for high load capacities to be met, using as a material a steel material containing, by mass %, c: 0.2 to 0.6%, si: 0.05 to 1.5%, mn: 0.2 to 2.5%, p: 0.025% or less, s: 0.003 to 0.05%, cr: 0.05 to 0.5%, al: 0.01 to 0.05%, and n: 0.003 to 0.025%, and having a balance of fe and impurities, having formed on the steel surface a compound layer of a thickness 3 μm or less comprising iron, nitrogen, and carbon and a hardened layer formed below the compound layer, and having an effective hardened layer depth of 160 to 410 μm.. . ... Nippon Steel Corporation

Steel sheet member combination structure, automotive structural member, center pillar, bumper, and door beam

A steel sheet member combination structure includes: a first steel sheet member having a main wall portion, a standing wall portion that stands from an end edge of the main wall portion, and a flange portion that extends parallel to the main wall portion from an end edge of the standing wall portion; and a second steel sheet member having a horizontal wall portion that is joined to at least one of an inner surface or an outer surface of the first steel sheet member and that abuts the main wall portion and a side wall portion that abuts the standing wall portion, and the first steel sheet member and the second steel sheet member satisfy predetermined relational expressions.. . ... Nippon Steel Corporation

Electrical steel sheet and manufacturing method thereof

An electrical steel sheet provides: a steel strip (1) for an electrical steel sheet; and an insulating film (2) formed at a surface of the steel strip (1) and containing metal phosphate and organic resin. At least a part of the metal phosphate includes at least one kind of crystal structure selected from a group consisting of a cubic system, a tetragonal system, a hexagonal system, and an orthorhombic system. ... Nippon Steel Corporation

Coated steel

The invention provides a coated steel including a steel, a coated metal layer coated on a surface of the steel, and an interfacial alloy layer formed at the boundary between the steel and the coated metal layer, in which the composition of the coated metal layer includes in terms of % by mass zn from 20 to 83%, and al from 2.5 to 46.5% as well as mg and impurities as the balance, in which the mg content is 10% or more, in which the structure of the coated metal layer includes a quasicrystalline phase, a mgzn2 phase, and a balance structure, in which the area fraction of the quasicrystalline phase is from 30 to 60%, and not less than 90 number-% of the quasicrystalline phases are a quasicrystalline phase having a particle diameter in the major axis direction of from 0.05 to 1.0 μm, and in which the thickness of the coated metal layer is 0.1 μm or more, and the thickness of the interfacial alloy layer is 500 nm or less.. . ... Nippon Steel Corporation

Zn-al-mg coated steel sheet, and method of producing zn-al-mg coated steel sheet

Provided is a zn—al—mg coated steel sheet having a plated layer including from 4 to 22% by mass of al, from 1.0 to 6.5% by mass of mg wherein mg is ½ or less of al in terms of % by mass, from 0.001 to 1.000% by mass of si, as well as zn and impurities as the balance, wherein the structure of the plated layer contains an al primary crystal, the al primary crystal including: a cellular dendrite-shaped first al primary crystal with an area rate of from 30 to 70% and a second axis spacing of from 0.5 to 2.0 μm; a minute equi-axed dendrite-shaped second al primary crystal with a principal axis length of from 5 to 10 μm and a second axis spacing of from 0.5 to 2.0 μm; and a petal-shaped third al primary crystal with a principal axis length of from 0.5 to 3.0 μm, wherein a total area rate of the minute equi-axed dendrite-shaped second al primary crystal and the petal-shaped third al primary crystal is of from 30 to 70%; and a ternary eutectic structure of al, zn, and mg2zn11 as a structure other than the al primary crystal.. . ... Nippon Steel Corporation

Austenitic stainless steel foil

Provided is an austenitic stainless steel foil that demonstrates a high degree of stretch formability and little deformation anisotropy with respect to stretch forming despite having a sheet thickness of 60 μm or less. The austenitic stainless steel foil of the present invention has a sheet thickness of 5 μm to 60 μm, a recrystallization rate of 90% to 100%, and a texture in which the total of the area ratio of a crystal orientation in which the difference in orientation from the {112}<111> orientation is within 10°, the area ratio of a crystal orientation in which the difference in orientation from the {110}<112> orientation is within 10°, and the area ratio of a crystal orientation in which the difference in orientation from the {110}<001> orientation is within 10°, in a measuring field thereof, is 20% or less.. ... Nippon Steel Corporation

Steel sheet

A steel sheet includes: a predetermined chemical composition; and a steel structure containing, in are a fraction, 2% or more of ferrite and bainite, in which an average dislocation density in the ferrite and an average dislocation density in the bainite are both h3×1012 m/m3 to 1×1014 m/m3, and an average grain diameter of the ferrite and the bainite is 5 μm or less.. . ... Nippon Steel Corporation

Stainless steel pipe and method of manufacturing the same

A stainless steel pipe has a composition of, in mass %: c: up to 0.02%; si: 0.05 to 1.00%; mn: 0.1 to 1.0%; p: up to 0.030%; s: up to 0.002%; ni: 5.5 to 8%; cr: 10 to 14%; mo: 2 to 4%; v: 0.01 to 0.10%; ti: 0.05 to 0.3%; nb: up to 0.1%; al: 0.001 to 0.1%; n: up to 0.05%; cu: up to 0.5%; ca: 0 to 0.008%; mg: 0 to 0.05%; b: 0 to 0.005%; and balance fe and impurities. The pipe having a microstructure including martensite and, by volume fraction, 12 to 18% retained austenite. ... Nippon Steel Corporation

Lap welding method of steel sheet and lap weld joint of steel sheet

A lap welding method of a steel sheet includes spot welding in a state in which the flange portion of a second steel sheet member having the flange portion and a standing wall portion is overlapped with the first steel sheet member, thereby forming a nugget between a first steel sheet member and a flange portion; and, after the spot welding, laser welding a region between an r stop of the standing wall portion and the nugget, thereby forming a weld bead, and, in the weld bead, a length dimension is equal to or longer than a diameter of the nugget, and a width dimension is 0.5 to 3.0 mm.. . ... Nippon Steel Corporation

Material for organic electroluminescent device and organic electroluminescent device using same

. . Provided are a material for an organic electroluminescent device showing excellent electron- and hole-injecting/transporting properties, and having proper lowest singlet excitation energy and proper lowest triplet excitation energy, and an organic el device using the material. The material for an organic electroluminescent device includes a heterocyclic compound represented by the general formula (1) where: r1 represents an aromatic hydrocarbon group having 6 to 30 carbon atoms, an aromatic heterocyclic group having 3 to 22 carbon atoms, or a linked aromatic group obtained by linking 2 to 6 aromatic rings of the aromatic groups, an alkyl group, or an alkoxy group; r2 to r5 each represent an aromatic hydrocarbon group having 6 to 30 carbon atoms, an aromatic heterocyclic group having 3 to 22 carbon atoms, the group containing only oxygen or sulfur as a heteroatom, or a linked aromatic group obtained by linking 2 to 6 aromatic rings of the aromatic groups, an alkyl group, or an alkoxy group; and a, b, c, and d each represent an integer of from 0 to 2.. ... Nippon Steel Corporation

Steel plate and method of production of same

Low carbon steel plate excellent impact resistance characteristics after carburizing and quenching and after tempering, characterized by having a predetermined chemical composition, an average grain size of carbides of 0.4 μm to 2.0 μm, an area ratio of pearlite of 6% or less, a ratio of a number of carbides at the ferrite grain boundaries to the number of carbides inside the ferrite grains of over 1, and a vickers hardness of 100hv to 180hv.. . ... Nippon Steel Corporation

Steel sheet

A steel sheet includes: a predetermined chemical composition; and a steel structure represented by, in area %, first martensite in which two or more iron carbides each having a circle-equivalent diameter of 2 nm to 500 nm are contained in each lath: 20% to 95%, ferrite: 15% or less, retained austenite: 15% or less, and the balance: bainite, or second martensite in which less than two iron carbides each having a circle-equivalent diameter of 2 nm to 500 nm are contained in each lath, or the both of these, in which the total area fraction of nd//<111> orientation grains and nd//<100> orientation grains is 40% or less, and the content of solid-solution c is 0.44 ppm or more.. . ... Nippon Steel Corporation

08/16/18 / #20180230580

Stainless steel product

Provided is a stainless steel product having a chemical composition consisting of c: less than 0.05%, si: 4.0 to 7.0%, mn: 1.50% or less, p: 0.030% or less, s: 0.030% or less, cr: 10.0 to 20.0%, ni: 11.0 to 17.0%, cu: 0.15 to 1.5%, mo: 0.15 to 1.5%, nb: 0.5 to 1.2%, sol. Al: 0 to 0.10%, mg: 0 to 0.01%, and balance fe and impurities, wherein mgo.al2o3 inclusions constitute an area fraction of 0.02% or less. ... Nippon Steel Corporation

08/09/18 / #20180223521

Column and beam connection structure and method

A column and beam connection structure for connecting a steel h-beam to a column uses an external diaphragm. The external diaphragm includes a plurality of divided diaphragm segments such that each diaphragm segment has a column plate abutting on the column. ... Nippon Steel Corporation

08/02/18 / #20180216251

Method for producing epitaxial silicon carbide single crystal wafer

A method for producing an epitaxial silicon carbide single crystal wafer comprised of a silicon carbide single crystal substrate having a small off angle on which a high quality silicon carbide single crystal film with little basal plane dislocations is provided, that is, a method for producing an epitaxial silicon carbide single crystal wafer epitaxially growing silicon carbide on a silicon carbide single crystal substrate using a thermal cvd method, comprising supplying an etching gas inside the epitaxial growth reactor to etch the surface of the silicon carbide single crystal substrate so that the arithmetic average roughness ra value becomes 0.5 nm to 3.0 nm, then starting epitaxial growth to convert 95% or more of the basal plane dislocations at the surface of the silicon carbide single crystal substrate to threading edge dislocations.. . ... Nippon Steel Corporation

08/02/18 / #20180216215

Austenitic heat-resistant alloy and welded structure

An austenitic heat-resistant alloy has a chemical composition of, in mass %: 0.04 to 0.14% c; 0.05 to 1% si; 0.5 to 2.5% mn; up to 0.03% p; less than 0.001% s; 23 to 32% ni; 20 to 25% cr 1 to 5% w; 0.1 to 0.6% nb; 0.1 to 0.6% v; 0.1 to 0.3% n; 0.0005 to 0.01% b; 0.001 to 0.02% sn; up to 0.03% ai; up to 0.02% 0; 0 to 0.5% ti; 0 to 2% co; 0 to 4% cu; 0 to 4% mo; 0 to 0.02% ca; 0 to 0.02% mg; 0 to 0.2% rem; and the balance being fe and impurities. The alloy microstructure has a grain size number in accordance with astm e112 of 2.0 or more and less than 7.0.. ... Nippon Steel Corporation

08/02/18 / #20180216211

Titanium composite material and titanium material for hot rolling

A titanium composite material 1 is provided that includes: an inner layer 5 consisting of a commercially pure titanium or a titanium alloy; an outer layer 3 formed on at least one surface of the inner layer 5 and having a chemical composition that is different from a chemical composition of the inner layer 5; and an intermediate layer formed between the inner layer 5 and the outer layer 3 and having a chemical composition that is different from the chemical composition of the inner layer 5. The thickness of the outer layer 3 is 2 μm or more, and occupies no more than 40% of the overall thickness per side. ... Nippon Steel Corporation

08/02/18 / #20180216210

Titanium composite material and titanium material for hot working

Provided is a titanium composite material 1 including: a first surface layer portion 2; an inner layer portion 4; and a second surface layer portion 3; wherein: the first surface layer portion 2 and the second surface layer portion 3 are composed of a titanium alloy; the inner layer portion 4 is composed of a commercially pure titanium including pores; a thickness of at least one of the first surface layer portion 2 and the second surface layer portion 3 is 2 μm or more, and a proportion of the thickness with respect to an overall thickness of the titanium composite material 1 is 40% or less; and a porosity in a cross section perpendicular to a sheet thickness direction is more than 0% and 30% or less.. . ... Nippon Steel Corporation

08/02/18 / #20180216206

Steel sheet with strain induced transformation type composite structure and method of manufacturing same

There is provided a steel sheet with strain induced transformation type composite structure having a predetermined chemical composition in which a microstructure at the ¼ thickness of the steel sheet includes, by area ratio, 50% to 85% of a polygonal ferrite, 3% to 10% of a residual austenite, 5% to 47% of bainite and 1% or less of a fresh martensite and a tempered martensite in total and satisfies the equation of 0.01<ex.c/fsd≤0.015, the microstructure includes 1×1016 pieces/cm3 or more of precipitates containing tic, an average grain diameter of the residual austenite 1.0 μm to 5.0 μm at an equivalent circle diameter, an average of closest distances of the austenite is 3.0 μm to 10.0 μm, and an average diameter of the precipitates is 3 nm or less.. . ... Nippon Steel Corporation

08/02/18 / #20180214919

Edging method and edging device

An edging method including changing an incident angle of a slab with respect to a pair of edging members that are disposed on a conveyance line of the slab and that edge the slab based on information relating to the slab acquired at at least one of prior to edging or after edging.. . ... Nippon Steel Corporation

07/26/18 / #20180212537

Power supply system

. . A pseudo-resonant element (130) is disposed in series with respect to an inductive load (180) on the inductive load (180) side rather than an output end of an inverter unit (120) constituted of a magnetic energy recovery switch.. . ... Nippon Steel Corporation

07/26/18 / #20180209965

Resin-platinum complex and usage thereof

This resin-platinum composite 100 is provided with resin particles 10 and platinum particles 20, and the platinum particles 20 are immobilized on the resin particles 10. In the resin-platinum composite 100, one portion of the platinum particles 20 may be distributed three-dimensionally on surface layer sections 60 of the resin particles 10. ... Nippon Steel Corporation

07/26/18 / #20180209007

High strength hot rolled steel sheet

There is provided a high strength hot rolled steel sheet including a predetermined chemical composition. A structure includes, by area ratio, 80% or more of polygonal ferrite, a total of 5% or less of martensite and austenite, and a total of 5% or less of pearlite and cementite, and a remainder is at least one selected from bainitic ferrite and bainite. ... Nippon Steel Corporation

07/26/18 / #20180209006

Steel sheet, hot-dip galvanized steel sheet, galvannealed steel sheet, and manufacturing methods therefor

A steel sheet according to an aspect of the present invention has predetermined chemical composition, in which a structure at a thickness ¼ portion includes, in terms of volume ratios, tempered martensite: 30% to 70% and one or both of ferrite and bainite: a total of 20% to 70%, in the structure at the thickness ¼ portion, a volume ratio of residual austenite is less than 10%, a volume ratio of fresh martensite is 10% or less, a volume ratio of pearlite is 10% or less, and a total volume ratio of the residual austenite, the fresh martensite, and the pearlite is 15% or less, a number density of iron-based carbides having a major axis of 5 nm or more in the tempered martensite at the thickness ¼ portion is 5×107 particles/mm2 or more, a ratio of the number of ε-type carbides in the number of the iron-based carbides having the major axis of 5 nm or more at the thickness ¼ portion is 20% or more, and a tensile strength is 780 mpa or higher.. . ... Nippon Steel Corporation

07/26/18 / #20180207751

Fillet arc welded joint and method for producing same

A fillet arc welded joint formed by fillet arc welding at least two metal members, comprising a remelted and solidified portion obtained by irradiating a laser at a weld toe portion of the fillet arc welding of at least one metal member and a region including a boundary of the heat affected zone caused by the fillet arc welding at the surface of that metal member, the remelted and solidified portion being a range from a surface of the metal member to a depth of ½ or less of the thickness of that metal member, an average effective crystal grain diameter of prior austenite at a heat affected zone from a boundary of the remelted and solidified portion at the surface of the metal member to a depth of 0.1 mm in the thickness direction of the metal member being 20 μm or less.. . ... Nippon Steel Corporation

07/19/18 / #20180205082

Electrode, method for producing electrode, battery, and method for using clathrate compound

. . An electrode containing a clathrate compound is disclosed that is more likely to withstand load involved in repetition of penetration and desorption of, e.g., lithium ions compared to no guest substance-encapsulating silicon clathrate compounds. An electrode active material making up the electrode according to the present invention includes a clathrate compound. ... Nippon Steel Corporation

07/19/18 / #20180202019

Steel sheet, hot-dip galvanized steel sheet, galvannealed steel sheet, and manufacturing methods therefor

A steel sheet according to an aspect of the present invention has predetermined chemical composition, in which a structure at a thickness ¼ portion includes, in terms of volume ratios, tempered martensite: 70% or more and one or both of ferrite and bainite: a total of less than 20%, in the structure at the thickness ¼ portion, a volume ratio of residual austenite is less than 10%, a volume ratio of fresh martensite is 10% or less, a volume ratio of pearlite is 10% or less, and a total volume ratio of the residual austenite, the fresh martensite, and the pearlite is 15% or less, a number density of iron-based carbides having a major axis of 5 nm or more in the tempered martensite at the thickness ¼ portion is 5×107 particles/mm2 or more, a ratio of the number of ε-type carbides in the number of the iron-based carbides having the major axis of 5 nm or more at the thickness ¼ portion is 20% or more, and a tensile strength is 780 mpa or higher.. . ... Nippon Steel Corporation

07/19/18 / #20180202016

High-strength cold-rolled steel sheet, high-strength hot-dip galvanized steel sheet and high-strength galvannealed steel sheet

A high-strength cold-rolled steel sheet is provided that has a chemical composition that consists of, by mass %, c: 0.050 to 0.40%, si: 0.01 to 3.0%, mn: 1.0 to 5.0%, sol. Al: 0.001 to 1.0%, ti: 0.005 to 0.20%, b: 0.0005 to 0.010%, p: 0.1% or less, s: 0.01% or less, o: 0.1% or less, n: 0.01% or less, cr: 0 to 1.0%, mo: 0 to 1.0%, ni: 0 to 1.0%, cu: 0 to 1.0%, sn: 0 to 0.50%, nb: 0 to 0.20%, v: 0 to 0.50%, w: 0 to 0.50%, ca: 0 to 0.01%, mg: 0 to 0.01%, bi: 0 to 0.01%, sb: 0 to 0.10%, zr: 0 to 0.01%, and rem: 0 to 0.01%, with the balance being fe and impurities, and that satisfies the formulas [sol. ... Nippon Steel Corporation

07/19/18 / #20180201123

Plated steel sheet and fuel tank

A hot stamp molded body includes: a steel sheet (30); a first plating layer (10) on a first surface (31) of the steel sheet (30); and a second plating layer (20) on a second surface (32) of the steel sheet (30). The first plating layer (10) includes: a first al—fe—si alloy layer (11) on the first surface (31); and a first al—si alloy layer (12) on the first al—fe—si alloy layer (11). ... Nippon Steel Corporation

07/19/18 / #20180200772

Hole widening method, forming tool, and formed product

There is provided a hole widening method including a preparing process of preparing a forming tool which has a diameter-increasing portion increasing in diameter from a front end side toward a rear end side and a line-shaped projection formed to protrude outward from a surface of the diameter-increasing portion, and a workpiece in which a pilot hole is formed; and a hole widening process of successively widening the pilot hole by pushing the forming tool into the pilot hole such that the line-shaped projection of the forming tool comes into point contact with a part of a circumferential edge portion of the pilot hole in the workpiece two times or more, and forming a stretched flange.. . ... Nippon Steel Corporation

07/19/18 / #20180200766

Titanium material for hot rolling

A titanium material for hot rolling 1 includes a titanium cast piece 3, and titanium sheets 4 that are welded to faces corresponding to rolling surfaces 3a of the titanium cast piece 3. The titanium cast piece 3 and the titanium sheets 4 have the same kind of chemical composition. ... Nippon Steel Corporation

07/12/18 / #20180195154

Heat resistant titanium alloy material for exhaust system part use excellent in oxidation resistance, method of production of heat resistant titanium alloy material for exhaust system part use excellent in oxidation resistance, and exhaust system

A titanium alloy material for exhaust system parts excellent in oxidation resistance and cold workability able to be used for an exhaust manifold, exhaust pipe, catalyst device, muffler, or other part characterized by containing, by mass %, cu: 0.5 to 1.5%, sn: 0.5 to 1.5%, si: 0.1% to 0.6%, o: 0.1% or less, and fe: 0.15% or less, and a balance of ti and impurities, having a total of the contents of cu and sn of 1.4 to 2.7%, and having a total of the volume rates of the β-phases and ti—cu and ti—si intermetallic compounds of 1.0% or less.. . ... Nippon Steel Corporation

07/12/18 / #20180194310

Bumper reinforcement and vehicle including the same

A bumper reinforcement includes a first member, and a second member. The first member includes a flat plate part, and two first upstanding parts. ... Nippon Steel Corporation

07/05/18 / #20180191000

Titanium product

. . There is provided a titanium product for a separator of a polymer electrolyte fuel cell (pefc). The titanium product includes a substrate made of a titanium or a titanium alloy, and a passivation film formed on a surface of the substrate, wherein the passivation film includes a li-containing titanium oxide layer in its surface layer. ... Nippon Steel Corporation

07/05/18 / #20180187313

Surface-treated steel sheet for fuel tanks

A surface-treated steel sheet for fuel tanks, including: a zn—ni alloy plating layer on one surface or both surfaces of a steel sheet; and a trivalent chromate covering layer or a chromate-free covering layer on the zn—ni alloy plating layer. The steel sheet consists of, in mass %, c: 0.0005 to 0.0050%, si: 0.01 to 1.00%, mn: 0.70 to 2.00%, p: less than or equal to 0.060%, s: less than or equal to 0.010%, al: 0.01 to 0.30%, n: 0.001 to 0.010%, ti: 0.010 to 0.050%, nb: 0.010 to 0.040%, b: 0.0005 to 0.0030%, and the balance: fe and unavoidable impurities. ... Nippon Steel Corporation

07/05/18 / #20180187278

Steel pipe for line pipe and method for manufacturing the same

A steel pipe for line pipe has a composition of, in mass %: c: 0.02 to 0.11%; si: 0.05 to 1.0%; mn: 0.30 to 2.5%; p: up to 0.030%; s: up to 0.006%; cr: 0.05 to 0.36%; mo: 0.02 to 0.33%; v: 0.02 to 0.20%; ti: 0.001 to 0.010%; al: 0.001 to 0.100%; n: up to 0.008%; ca: 0.0005 to 0.0040%; and other elements and satisfies cr+mo+v≤0.40, the chemical symbols in the equation substituted by the content of the corresponding element in mass %. The pipe contains tempered martensite and/or tempered bainite and further contains ferrite in at least one of a portion between a steel pipe outer surface and a depth of 1 mm from the outer surface, and a portion between a steel pipe inner surface and a depth of 1 mm from the inner surface.. ... Nippon Steel Corporation

07/05/18 / #20180185903

Mechanical joining apparatus and mechanical joining method

Provided is a mechanical joining apparatus enabling reduction of breakage of the area around a rivet of a joint obtained by riveting, the apparatus comprising a punch and die, blank holder, first power device, second power device and cooling device, wherein the first power device is configured to start supply of current through the holder and die so as to raise the temperature of the sheets before the punch drives in the rivet, the second power device is configured to start supply of current through the punch and die so as to supply current through and heat treat the rivet after the punch drives in the rivet, and the cooling device is connected to the punch and is configured to cool the rivet after the rivet is heat treated.. . ... Nippon Steel Corporation

07/05/18 / #20180185902

Mechanical joining apparatus and mechanical joining method

Provided is a mechanical joining apparatus enabling stable riveting when joining metal sheets even when the sheets are large in deformation resistance, the apparatus comprising a punch and die, blank holder and power device, wherein the punch and die are arranged facing each other, the holder is configured by an electrode material able to push against and electrically heat the sheets by one end of the holder, the punch is comprised of a material able to drive in a rivet, the die is comprised of an electrode material able to support and electrically heat the sheets, and the power device is configured to start supply of current through the holder and die so as to raise the temperature of the sheets at the same time as the start of driving in of the rivet and to continue to supply current until the end of driving in of the rivet.. . ... Nippon Steel Corporation

07/05/18 / #20180185899

Method and apparatus for manufacturing press component

A method and apparatus for manufacturing a press component without generating cracks in a flange on an inner circumferential side of a curved portion includes press working by a free bending method on a blank consisting of an ultra-high tensile strength steel sheet. A press component is manufactured by performing cold press working on a blank of an ultra-high tensile strength steel sheet. ... Nippon Steel Corporation

06/28/18 / #20180179619

Austenitic heat-resistant alloy and welded structure

. . An austenitic heat-resistant alloy is provided that provides good crack resistance and high-temperature strength in a stable manner. The austenitic heat-resistant alloy has a chemical composition of, in mass %: 0.04 to 0.15% c; 0.05 to 1% si; 0.3 to 2.5% mn; up to 0.04% p; up to 0.0015% s; 2 to 4% cu: 11 to 16% ni; 16 to 20% cr; 2 to 5 % w; 0.1 to 0.8% nb; 0.05 to 0.35% ti; 0.001 to 0.015% n; 0.0005 to 0.01% b; up to 0.03% al; up to 0.02 % o; 0 to 0.02 % sn; 0 to 0.5 % v; 0 to 2 % co; 0 to 5% mo; 0 to 0.02% ca; 0 to 0.02% mg; 0 to 0.2% rem; and the balance being fe and impurities, the alloy having a microstructure with a grain size represented by a grain size number in accordance with astm e112 of 2.0 or more and less than 7.0.. ... Nippon Steel Corporation

06/21/18 / #20180172436

Method and device for inspecting crankshaft

. . . . The present invention provides a method for inspecting a crankshaft, which enables accurate detection of defects which occur partially in the crankshaft, such as underfills and dent flaws, by discriminating these defects from bending and torsion over an entire length of the crankshaft. The present invention includes steps of: acquiring three-dimensional point cloud data over an entire length of a measurement object region of a crankshaft s by an optical three-dimensional shape measurement device 1; dividing the acquired three-dimensional point cloud data to create a plurality of subregion three-dimensional point cloud data, each of the subregion three-dimensional point cloud data respectively corresponding to each of a plurality of subregions of the crankshaft along a direction parallel to the rotational center axis l of the crankshaft; translating and rotating each of the created subregion three-dimensional point cloud data to superpose each of the subregion three-dimensional point cloud data on a surface shape model of the crankshaft, such that a distance between each of the subregion three-dimensional point cloud data and the surface shape model becomes minimum; and detecting a partial defect such as an underfill of the crankshaft based on a distance between each of the subregion three-dimensional point cloud data after being superposed and the surface shape model.. ... Nippon Steel Corporation

06/21/18 / #20180172197

Threaded tubular element provided with a metallic anti-corrosion and anti-galling coating

The invention concerns a threaded portion of a tubular element for a threaded tubular connection hiving an axis of revolution, the portion comprising a threading extending over its outer or inner peripheral surface, and a first sealing surface on the peripheral surface, the first sealing surface being capable of producing metal-metal interference with a corresponding second sealing surface belonging to a complementary threaded portion of a tube. The threading and the first sealing surface are coated with a metallic anti-corrosion and anti-galling layer wherein zinc (zn) is tie major element by weight.. ... Nippon Steel Corporation

06/21/18 / #20180172034

Plunger member used for belt type continuously variable transmission

A plunger member 3 used for a belt type continuously variable transmission is configured by cold press molding a blank material 32 according to deep-drawing molding, and closed forging, compression molding or a combined molding thereof, where during the cold press molding, a thickness of a bent corner portion 3f, which at least makes a sleeve portion 3c and a step-like formed portion (spring seating portion) 3d continuous to each other, is configured to be increased by 30% or more relative to a thickness of the blank material 32, and then a hardened surface layer 3b is configured to be formed on both of the entire front and back sides of the plunger member by performing a soft nitriding treatment.. . ... Nippon Steel Corporation

06/21/18 / #20180171445

Steel plate and method of production of same

A steel plate improved in formability and wear resistance, having a predetermined chemical composition, having a metal structure of the steel plate having a ratio of number of carbides at ferrite grain boundaries with respect to a number of carbides in ferrite grains of over 1 and having a ferrite grain size of 5 μm to 50 μm, and having a vickers hardness of steel plate of 100 hv to 170 hv.. . ... Nippon Steel Corporation

06/21/18 / #20180171429

Heat-treated steel sheet member and method for producing the same

A heat-treated steel sheet member having a chemical including, by mass %: c: 0.05 to 0.50%; si: 0.50 to 5.0%; mn: 1.5 to 4.0%; p: 0.05% or less; s: 0.05% or less; n: 0.01% or less; ti: 0.01 to 0.10%; b: 0.0005 to 0.010%; cr: optional amounts of ni, cu, mo, v, ca, al, nb, and rem, with the balance: fe and impurities. The steel sheet member has a microstructure comprising: mainly martensite; and retained austenite of which a volume ratio is 5.0% or higher, a number density of retained carbide in the steel sheet member having circle-equivalent diameters of 0.1 mm or larger is 4.0×103/mm2 or lower, [(log fg0−log fg(0.02))/0.02<20.0] is satisfied when mechanical properties are measured using a sheet specimen specified in astm e8, a tensile strength is 1.4 gpa or higher, and a total elongation is 8.0% or higher.. ... Nippon Steel Corporation

06/21/18 / #20180171426

Steel pipe for fuel injection pipe and method for producing the same

A steel pipe for fuel injection pipe has a tensile strength of 500 to 900 mpa and a yield ratio of 0.50 to 0.85, and has a critical internal pressure (ip) satisfying [ip≥0.41×ts×α] (α=[(d/d)2−1]/[0.776×(d/d)2], where ts: tensile strength (mpa) of the steel pipe, d: steel pipe outer diameter (mm), and d: steel pipe inner diameter (mm)), wherein a circumferential-direction residual stress on an inner surface of the pipe is −20 mpa or lower after the steel pipe is split in half in a pipe axis direction.. . ... Nippon Steel Corporation

06/21/18 / #20180171261

Threaded tubular connection provided with a metallic coating on the threading and on the sealing surface

The invention concerns a threaded tubular connection for drilling or operating hydrocarbon wells, comprising a portion of a tubular element with a male end having an axis of revolution and provided with a first threading extending about the axis of revolution, said male end portion being complementary with a portion of a tubular element with a female end having an axis of revolution and provided with a second threading extending about the axis of revolution, said male and female end portions being capable of being connected by makeup, each of the male and female end portions further comprising a sealing surface with a metal-metal interference, wherein the threading and the sealing surface of one of the two, male or female, end portions are coated with a first metallic anti-corrosion and anti-galling layer wherein zinc (zn) is the major element by weight, said first metallic anti-corrosion and anti-galling layer being coated with a first passivation layer, and the complementary threading and sealing surface of the male or female end are coated with a second metallic anti-galling layer wherein zinc (zn) is the major element by weight, the second metallic anti-galling layer being at least partially coated with a lubricant layer comprising a resin and a dry solid lubricant powder dispersed in said resin.. . ... Nippon Steel Corporation

06/21/18 / #20180169742

Apparatus and method for manufacturing forged crankshaft

A forged crankshaft manufacturing apparatus processes a forged blank with no flash. The forged blank includes at least one rough crank arm having an excess portion protruding from an outer periphery of a side portion thereof. ... Nippon Steel Corporation

06/14/18 / #20180166696

Fuel cell electrode catalyst, method of producing the same, and fuel cell

. . A fuel cell electrode catalyst includes a carbon support having pores, and catalyst particles supported on the carbon support and containing platinum or a platinum alloy. The pores of the fuel cell electrode catalyst have a mode pore size within a range from 2 nm to 5 nm. ... Nippon Steel Corporation

06/14/18 / #20180161766

Catalyst block and method for manufacturing same

Provided is a catalyst block for cleaning exhaust gas, having: a square-shaped honeycomb core provided with first-fourth outside surfaces; a first plate attached to the first outside surface; a second plate attached to the second outside surface; and an exterior frame disposed along the outer periphery of the firm and solid honeycomb core formed from the honeycomb core, the first plate and the second plate, the exterior frame being provided with a recessed part that at least encases the first plate, the second plate, the third outside surface and the fourth outside surface. In the catalyst block, a catalyst is supported in the honeycomb core, the first plate and the second plate, and the catalyst is not supported in the exterior frame.. ... Nippon Steel Corporation

06/07/18 / #20180156263

Crankshaft for reciprocating engine

. . A crankshaft includes journals serving as a central axis of rotation, crank pins decentered from the journals, and crank arms connecting the journals and the crank pins. Some or all of the crank arms have counterweights integrated therewith. ... Nippon Steel Corporation

06/07/18 / #20180155840

Insulating coating for electrical steel sheet

An insulating coating for an electrical steel sheet is provided that is formed on a surface of a base metal of the electrical steel sheet and that contains a polyvalent metal phosphate of one or more elements selected from al, zn, mg and ca, and has an enriched layer of a divalent metal at an interface with the surface of the base metal. An enrichment of the divalent metal contained in the enriched layer is 0.01 g/m2 or more and less than 0.2 g/m2.. ... Nippon Steel Corporation

06/07/18 / #20180154410

Method for producing seamless metal tube

Provided is a round billet capable of reducing damage on a piercing plug in a method of producing a seamless metal tube with a mannesmann process. The round billet (5), for use in a seamless metal tube, to be produced into a seamless metal tube with a mannesmann process includes a body having a hole (6) formed in an axial direction of the body. ... Nippon Steel Corporation

05/31/18 / #20180148809

High-strength steel sheet and method of manufacturing the same

A high-strength steel sheet includes a specific chemical composition, and a microstructure represented by, in area %, martensite: 5% or more; ferrite: 20% or more; and perlite: 5% or less. An average diameter of martensite grain is 4 μm or less in equivalent circle diameter. ... Nippon Steel Corporation

05/31/18 / #20180147621

Apparatus for manufacturing forged crankshaft

An apparatus for manufacturing a forged crankshaft includes a pair of upper and lower dies and a first tool. The pair of dies deforms first excess portions and thereby thickens both side portions of a rough crank arm, in a region near a rough pin adjacent thereto. ... Nippon Steel Corporation

05/24/18 / #20180142334

High cr-based austenitic stainless steel

. . A high cr austenitic stainless steel with a chemical composition consisting of in terms of % by mass, 0.03 to 0.12% of c, 0.10 to 1.00% of si, 0.10 to 3.00% of mn, 0.030% or less of p, 0.020% or less of s, 21.50 to 28.00% of cr, more than 26.00 and not more than 35.00% of ni, more than 2.00 and not more than 5.00% of w, 0.80% or less of co, 0.01 to 0.70% of v, 0.15 to 1.00% of nb, 0.001 to 0.040% of al, 0.0001 to 0.0100% of b, 0.010 to 0.400% of n, 0.001 to 0.200% of zr, 0.001 to 0.200% of nd, 0.001 to 0.200% of ta, 0.020 to 0.200% of ta+0.8nd+0.5zr, 0.025% or less of ti+sn+sb+pb+as+bi, 0.0090% or less of o, and a remainder consisting of fe and impurities.. . ... Nippon Steel Corporation

05/24/18 / #20180142333

Spring steel

Spring steel includes: as a chemical composition, by mass %, c: 0.40% to 0.60%, si: 0.90% to 2.50%, mn: 0.20% to 1.20%, cr: 0.15% to 2.00%, ni: 0.10% to 1.00%, ti: 0.030% to 0.100%, b: 0.0010% to 0.0060%, n: 0.0010% to 0.0070%, cu: 0% to 0.50%, mo: 0% to 1.00%, v: 0% to 0.50%, nb: 0% to 0.10%, p: limited to less than 0.020%, s: limited to less than 0.020%, al: limited to less than 0.050%, and a remainder including fe and impurities, in a case where [ti] represents a ti content and [n] represents a n content by mass %, the chemical composition satisfies ([ti]-3.43×[n])>0.03, and a total number density of a ti carbide and a ti carbonitride having a diameter of 5 nm to 100 nm is more than 50 piece/μm3.. . ... Nippon Steel Corporation

05/17/18 / #20180138795

Eddy current deceleration device

. . The disclosed is a deceleration device including a cylindrical brake member fixed to a rotary shaft, a plurality of permanent magnets arrayed in a circumferential direction of a circle around the rotary shaft, a cylindrical magnet holder holding the permanent magnets, and a switching mechanism that switches between a braking state and a non-braking state. The plurality of permanent magnets include primary magnets and secondary magnets that are arrayed alternatively in the circumferential direction. ... Nippon Steel Corporation

05/17/18 / #20180138468

Steel foil for electrical storage device container, container for electrical storage device, and electrical storage device

A steel foil for an electrical storage device container, including a steel foil, a metal chromium layer layered on the steel foil, and a hydrated chromium oxide layer layered on the metal chromium layer, in which the concentration of fe from a surface of the hydrated chromium oxide layer to a depth of 10 nm is less than 10% by mass, the area ratio of a site having an arithmetic mean roughness ra of 10 nm or more in a visual field of 1 μm at the surface of the hydrated chromium oxide layer is less than 20%, and a site having an arithmetic mean roughness ra of less than 10 nm in a visual field of 1 μm has an arithmetic mean roughness ra of 3 nm or less in a visual field of 1 μm at the surface of the hydrated chromium oxide layer, is adopted.. . ... Nippon Steel Corporation

05/17/18 / #20180138420

Organic electroluminescent element

Provided is an organic el device having a low driving voltage, high luminous efficiency, and a long lifetime. The organic el device is an organic electroluminescent device including a light-emitting layer between an anode and a cathode opposite to each other, in which: the light-emitting layer contains a host material and a light-emitting dopant material; and the host material is a material obtained by mixing a first host selected from compounds in each of which a diphenyltriazinyl group is bonded to one nitrogen atom of an indolocarbazole ring and a phenyl group of the diphenyltriazinyl group is substituted with one or more phenyl groups, and a second host selected from compounds in each of which aromatic hydrocarbon groups are bonded to two nitrogen atoms of a biscarbazole ring and at least one of the aromatic hydrocarbon groups is a fused aromatic hydrocarbon group.. ... Nippon Steel Corporation

05/17/18 / #20180136100

Breaking prediction method, program, recording medium, and arithmetic processing device

In a breaking prediction method of predicting a breaking portion of a component, which is obtained by forming a metal sheet, by using a finite element method, the breaking portion is easily and reliably extracted. This breaking prediction method includes a first step of performing forming analysis by using a finite element method in each of a case where the metal sheet is divided on the basis of a first mesh coarseness and a case where the metal sheet is divided on the basis of a second mesh coarseness which is coarser than the first mesh coarseness, a second step of obtaining a maximum main stress for each mesh in each of the case of the first mesh coarseness and the case of the second mesh coarseness, and a third step of obtaining a difference value between the maximum main stress in the case of the first mesh coarseness and the maximum main stress in the case of the second mesh coarseness in each portion of the component, and extracting a portion in the case of the first mesh coarseness, which corresponds to a portion in which the difference value is larger than a predetermined value, as the breaking portion.. ... Nippon Steel Corporation

05/17/18 / #20180135155

Steel sheet for heat treatment

A steel sheet for heat treatment having a chemical composition including, by mass %: c: 0.05 to 0.50%; si: 0.50 to 5.0%; mn; 1.5 to 4.0%; p: 0.05% or less; s: 0.05% or less; n: 0.01% or less; ti: 0.01 to 0.10%; b: 0.0005 to 0.010%; cr: 0 to 1.0%; ni: 0 to 2.0%; cu: 0 to 1.0%; mo: 0 to 1.0%; v: 0 to 1.0%; ca: 0 to 0.01%; al: 0 to 1.0%; nb: 0 to 1.0%; rem: 0 to 0.1%; and the balance: fe and impurities, wherein a maximum height roughness rz on a surface of the steel sheet is 3.0 to 10.0 μm, and a number density of carbide being present in the steel sheet and having circle-equivalent diameters of 0.1 μm or larger is 8.0×103/mm2 or lower.. . ... Nippon Steel Corporation

05/17/18 / #20180135154

Low alloy steel for oil country tubular goods having excellent sulfide stress cracking resistance and manufacturing method therefor

The low alloy steel for oil country tubular goods according to the present invention has a chemical composition containing, by mass percent, c: 0.56 to 1.00%, si: 0.05 to 0.50%, mn: 0.05 to 1.00%, p: at most 0.025%, 5: at most 0.010%, al: 0.005 to 0.100%, mo: 0.40 to 1.00%, v: 0.05 to 0.30%, and o: at most 0.010%, the balance being fe and impurities, wherein the yield stress thereof is at least 862 mpa, and the half-value width of a [211] crystal surface obtained by x-ray diffraction is at most 0.50°.. . ... Nippon Steel Corporation

05/17/18 / #20180135146

Steel sheet and method of production of same

A steel sheet improved in hardenability and material formability having a predetermined chemical composition, characterized in that, in the metal structure of the steel sheet, an average grain size of carbides is 0.4 μm to 2.0 μm, an area ratio of pearlite is 6% or less, when a number of carbides in ferrite grains is a and a number of carbides at ferrite grain boundaries is b, b/a>l, and when an x-ray diffraction intensity at {211}<011>at a plane of a part of ½ sheet thickness of the steel sheet is denoted by “i1” and an x-ray diffraction intensity at {100}<011>is denoted by “i0”, i1/i0<1 is satisfied, and the steel sheet has a vickers hardness of 100 hv to 150 hv.. . ... Nippon Steel Corporation

05/17/18 / #20180135145

Heat-treated steel sheet member and method for producing the same

A heat-treated steel sheet member having a composition including, by mass %: c: 0.05 to 0.50%; si: 0.50 to 5.0%; mn: 1.5 to 4.0%; p: 0.05% or less; s: 0.05% or less; n: 0.01% or less; ti: 0.01 to 0.10%; b: 0.0005 to 0.010%; cr: 0 to 1.0%; ni: 0 to 2.0%; cu; 0 to 1.0%; mo: 0 to 1.0%; v: 0 to 1.0%; ca: 0 to 0.01%; al: 0 to 1.0%; nb: 0 to 1.0%; rem: 0 to 0.1%; and the balance: fe and impurities. The steel sheet member has a microstructure comprising mainly martensite and retained austenite of which a volume ratio is 0.2 to 1.0%, a number density of retained carbide in the steel sheet member having circle-equivalent diameters of 0.1 mm or larger is 4.0×103/mm2 or lower, a tensile strength is 1.4 gpa or higher, and a yield ratio is 0.65 or higher.. ... Nippon Steel Corporation

05/17/18 / #20180133843

Bonding wire for semiconductor device

A bonding wire for a semiconductor device includes a cu alloy core material and a pd coating layer formed on a surface thereof. Containing an element that provides bonding reliability in a high-temperature environment improves the bonding reliability of the ball bonded part in high temperature. ... Nippon Steel Corporation

05/10/18 / #20180127848

Steel sheet and method for production thereof

. . The present invention provides steel sheet excellent in cold formability and ductility after heat treatment and a method for production thereof. The steel sheet of the present invention is steel sheet which has a chemical composition containing, by mass %, c: 0.10 to 0.40%, si: 0.30 to 1.00%, mn: 0.30 to 1.00%, al: 0.001 to 0.10%, p: 0.0001 to 0.02%, and s: 0.0001 to 0.01% and having a balance of fe and impurities, which steel sheet characterized in that a ratio (b/a) of the number of carbides at the ferrite grain boundaries (b) to the number of carbides inside the ferrite grains (a) is over 1, a ferrite grain size is 5 μm to 50 μm, an average grain size of carbides is 0.4 μm to 2.0 μm, a pearlite area ratio is 6% or less, and a vicker's hardness is 120 hv to 170 hv.. ... Nippon Steel Corporation

05/10/18 / #20180126439

Press-formed product and method for designing the same

A press-formed product is shaped by press-working from a tailored blank made up of a plurality of metal sheets butt-welded together. The press-formed product includes a flange section, and an arc-shaped area which is an area of the flange section which is formed by stretch flange deformation, and in which an inner peripheral edge is open. ... Nippon Steel Corporation

05/10/18 / #20180126437

Tailored blank for hot stamping, hot stamped member, and methods for manufacturing same

A tailored blank for hot stamping includes a welded portion formed by butt-welding a first aluminum-plated steel sheet and a second aluminum-plated steel sheet, an average al concentration of a weld metal in the welded portion is in a range of 0.3 mass % to 1.5 mass %, an ac3 point of the weld metal is 1250° c. Or lower, and furthermore, an aluminum layer formed during the butt-welding is present on a surface of the welded portion.. ... Nippon Steel Corporation

05/10/18 / #20180126433

Press-forming apparatus and press-forming method

This press-forming apparatus is a press-forming apparatus for manufacturing a press-formed article from a workpiece sheet by moving at least one of a die and a punch so as to be close to each other in a press-forming direction, the press-formed article having a top portion, a first sidewall portion, and a second sidewall portion, the first sidewall portion and the second sidewall portion being connected to ridge portions formed on both edges of the top portion, wherein the die includes: a die slide; a first divisional die; a second divisional die; a second divisional die driving unit; a die pad; a die pad driving unit; an insert block; and an insert block driving unit.. . ... Nippon Steel Corporation

05/03/18 / #20180123154

Support carbon material and catalyst for solid polymer type fuel cell use

A support carbon material able to support a catalyst metal in a highly dispersed state and resistant to the flooding phenomenon and with little voltage drop even at the time of large current power generation under high humidity conditions and a catalyst using the same, specifically, a support carbon material for solid polymer type fuel cell use comprised of a porous carbon material which has a pore volume and a pore area found by the bjh analysis method from a nitrogen adsorption isotherm in an adsorption process of a radius 2 nm to 50 nm pore volume va of 1 ml/g to 5 ml/g and a radius 2 nm to 50 nm pore area s2-50 of 300 m2/g to 1500 m2/g and a ratio (v5-25/va) of radius 5 nm to 25 nm pore volume v5-25 (ml/g) to said pore volume va (ml/g) of 0.4 to 0.7 and a ratio (v2-5/va) of radius 2 nm to 5 nm pore volume v2-5 (ml/g) to the same of 0.2 to 0.5 and a catalyst using the same.. . ... Nippon Steel Corporation

05/03/18 / #20180122765

Bonding wire for semiconductor device

A bonding wire for a semiconductor device includes a cu alloy core material and a pd coating layer on a surface of the cu alloy core material, and contains ga and ge of 0.011 to 1.2% by mass in total, which is able to increase bonding longevity of the ball bonded part in the high-temperature, high-humidity environment, and thus to improve the bonding reliability. The thickness of the pd coating layer is preferably 0.015 to 0.150 μm. ... Nippon Steel Corporation

05/03/18 / #20180119258

Non-oriented magnetic steel sheet

There is provided a non-oriented magnetic steel sheet according to one aspect of the present invention including a predetermined composition, wherein a structure contains 99.0% by area or more of ferrite grains which do not have an unrecrystallized structure, wherein an average crystal grain size of the ferrite grains is 30 μm to 180 μm, wherein the ferrite grains contain metal cu particles of which a number density is 10,000 to 10,000,000 number/μm3 on the inside thereof, wherein the metal cu particles on the inside of the ferrite grains contain precipitation particles having a 9r structure of which a number density is 2% to 100% with respect to the number density of the metal cu particles, and precipitation particles having a bee structure of which a number density is 0% to 98% with respect to the number density of the metal cu particles, and wherein an average grain size of the metal cu particles on the inside of the ferrite grains is 2.0 nm to 10.0 nm.. . ... Nippon Steel Corporation

05/03/18 / #20180117655

Pressed component manufacturing method, pressed component, and pressing apparatus

A process of pressing a blank to form an intermediate formed component configured including a top plate, the ridge lines at short direction ends of the top plate, and vertical walls facing each other in a state extending from the respective ridge lines and at least one of the vertical walls configuring a curved wall curving as viewed from an upper side of the top plate, such that a step projecting toward an opposite side to a side on which the vertical walls face each other is formed to the curved wall so as to run along a length direction of the top plate. The method includes pressing the intermediate formed component to narrow a projection width of the step, or to move a portion of the curved wall where the vertical walls face each other.. ... Nippon Steel Corporation

04/19/18 / #20180107772

Stretch flange crack prediction method, stretch flange crack prediction apparatus, computer program, and recording medium

. . . . . . A stretch flange crack prediction method of predicting initiation of stretch flange cracks that occurs in a flange end section during stretch flange forming of a deformable sheet, includes: a measurement value acquisition process of acquiring, for each of a plurality of sheet-shaped test pieces, a fracture strain measurement value, a normal strain gradient measurement value, and a circumferential strain gradient measurement value; a cae analysis process of acquiring a maximum major strain maximum element having a highest maximum major strain, a normal strain gradient of the maximum major strain maximum element, and a circumferential strain gradient of the maximum major strain maximum element; a fracture determination threshold acquisition process of acquiring a fracture determination threshold by converting the fracture strain measurement value; and a prediction process of predicting that stretch flange cracks will be initiated, when the maximum major strain is equal to or higher than the fracture determination threshold.. . ... Nippon Steel Corporation

04/19/18 / #20180105908

Plated steel sheet

A base material (13) included in a plated steel sheet (1) includes a structure, at a ¼ sheet thickness position, represented by, in volume fraction: tempered martensite: 3.0% or more; ferrite: 4.0% or more; and retained austenite: 5.0% or more. An average hardness of the tempered martensite in the base material (13) is 5 gpa to 10 gpa, and a part or all of the tempered martensite and the retained austenite in the base material form an m-a. ... Nippon Steel Corporation

04/19/18 / #20180105893

High strength electric resistance welded steel pipe, method for producing steel plate for high strength electric resistance welded steel pipe use, and method for producing high strength electric resistance welded steel pipe

Electric resistance welded steel pipe securing the high strength and high toughness demanded from oil well pipe in recent years. The metal structure in a region having a width of 0.5 mm in both the thickness directions from a reference point, when using a point defined as a point ¼ of the thickness in the thickness direction from the surface in the base material part of the steel pipe as the reference point, consists of polygonal ferrite: 10 area % or less and a balance: bainitic ferrite. ... Nippon Steel Corporation

04/19/18 / #20180105891

Steel sheet with excellent cold workability during forming and method for manufacturing the same

The present invention provides a steel sheet having an excellent cold workability during forming and a method for producing the same. The steel sheet of the present invention is characterized in that: (a) the ratio of the number of carbides at the ferrite grain boundary to the number of carbides in the ferrite grain exceeds 1, (b) the ferrite grain diameter is 5 μm or more and 50 μm or less, (c) the in-plane anisotropy. ... Nippon Steel Corporation

04/19/18 / #20180104733

Pressed component manufacturing method, pressed component, and press apparatus

A method for manufacturing a pressed component including an elongated top plate, a wall having one end connected to a short direction end portion of the top plate, that curves with a convex shape bowing toward an opposite side to the top plate as viewed from an upper side of the top plate, and that includes a sharp curve portion, and a flange that is connected to another end of the wall, and that extends in a plate thickness direction of the wall toward the opposite side to the top plate side. The manufacturing method includes pressing to form an intermediate formed component including a preliminary flange and pressing to deform the preliminary flange to form the preliminary flange into the flange.. ... Nippon Steel Corporation

04/12/18 / #20180100244

Surface-treated steel sheet

. . A surface-treated steel sheet includes a steel sheet; and a plating layer which is formed on one surface or both surfaces of the steel sheet and which includes zinc and one of the group consisting of vanadium and zirconium, wherein the plating layer includes dendrite-shaped crystals including metallic zinc, and intercrystal filling regions which fill spaces between the dendrite-shaped crystals and show amorphous diffraction patterns when electron beam diffraction is carried out, wherein when the plating layer includes the vanadium, the intercrystal filling regions include a hydrated vanadium oxide or a vanadium hydroxide, and, wherein when the plating layer includes zirconium, the intercrystal filling regions include a hydrated zirconium oxide or a zirconium hydroxide.. . ... Nippon Steel Corporation

04/12/18 / #20180100226

Nitrided or soft nitrided part with excellent wear resistance and pitting resistance, and nitriding and soft nitriding method

A nitrided part and soft nitrided part with excellent wear resistance and pitting resistance and a nitriding method and soft nitriding method are provided, specifically, a nitrided part or soft nitrided part made by a steel material comprising, by mass %, c: 0.05 to 0.3%, si: 0.05 to 1.5%, mn: 0.2 to 1.5%, p: 0.025% or less, s: 0.003 to 0.05%, cr: 0.5 to 2.0%, al: 0.01 to 0.05%, and n: 0.003 to 0.025% and having a balance of fe and impurities, wherein, the surface layer comprises a compound layer containing iron, nitrogen, and carbon and a nitrogen diffusion layer positioned below the compound layer, the compound layer comprises an ϵ single phase, the ϵ single phase has a thickness of 8 to 30 μm and a vicker's hardness of 680 hv or more, and the ϵ single phase has a volume ratio of pores of less than 10%.. . ... Nippon Steel Corporation

04/05/18 / #20180096965

Method for forming ball in bonding wire

The present invention provides a ball forming method for forming a ball portion at a tip of a bonding wire which includes a core material mainly composed of cu, and a coating layer mainly composed of pd and formed over a surface of the core material, wherein the ball portion is formed in non-oxidizing atmosphere gas including hydrocarbon which is gas at room temperature and atmospheric pressure, the method being capable of improving pd coverage on a ball surface in forming a ball at a tip of the pd-coated cu bonding wire.. . ... Nippon Steel Corporation

04/05/18 / #20180094345

Case-hardened steel component

A case-hardened steel component includes a base metal and a carburized layer, the base metal has a predetermined chemical composition, a number density of ti-based precipitates having an equivalent circle diameter of 5 to 50 nm in a surface region from a surface to a depth of 0.1 mm is 0.5 pieces/μm2 or more, and in the surface region, a number density of aln having an equivalent circle diameter of 50 nm or more and 100 nm or less is 0.5 pieces/μm2 or less.. . ... Nippon Steel Corporation

04/05/18 / #20180094333

Stress-relief heat treatment apparatus

A stress-relief heat treatment apparatus according to the present invention for stress-relief heat-treating a rail which is welded includes an induction heating coil, and the induction heating coil is arranged at a lateral face of a web of the rail while being separated from a welding center of the rail by 20 mm to 300 mm in a longitudinal direction of the rail. The stress-relief heat treatment apparatus may include a plurality of the induction heating coils, and the induction heating coils may be arranged at both sides of the welding center. ... Nippon Steel Corporation

04/05/18 / #20180093315

Pressed component manufacturing method, pressed component, mold, and press apparatus

A manufacturing method for a pressed component of the present disclosure is a manufacturing method for a pressed component configured including an elongated top plate, ridge line portions at both short direction ends of the top plate, and vertical walls that face each other in a state extending from the ridge line portions. A punch and a die are employed to curve a blank into a convex profile bowing from the punch side toward the die side in a state in which the punch is caused to contact a first portion of the blank where the two end ridge line portions are to be formed, and to sandwich a second portion of the blank where the top plate is to be formed between the die and the punch and indent the second portion from the die side toward the punch side.. ... Nippon Steel Corporation

03/29/18 / #20180087172

Steel sheet for container and method for producing steel sheet for container

. . A steel sheet for a container includes: a steel sheet; a coated layer which contains ni and is provided as an upper layer of the steel sheet; and a chemical treatment layer which is provided as an upper layer of the coated layer, and contains a zr compound in an amount of 3.0 to 30.0 mg/m2 in terms of zr metal, and a mg compound in an amount of 0.50 to 5.00 mg/m2 in terms of mg metal, in which the coated layer is one of the group consisting of a ni coated layer which contains ni in amount of 10 to 1000 mg/m2 in terms of ni metal, and a composite coated layer which contains ni in an amount of 5 to 150 mg/m2 in terms of ni metal and sn in an amount of 300 to 3000 mg/m2 in terms of sn metal, and has an island-shaped sn coated layer formed on an fe—ni—sn alloy layer.. . ... Nippon Steel Corporation

03/29/18 / #20180087131

Titanium alloy, separator, and polymer electrolyte fuel cell

A titanium alloy contains 0.01 to 0.15% by mass of at least one of platinum group elements in total, and the balance being titanium, oxygen, and impurities, wherein, the titanium alloy includes particles of a compound that is made up of at least one of the platinum group elements, titanium, and oxygen, an average size of the particles on a surface of the titanium alloy is 1 μm or smaller, and a number density of the particles on the surface of the titanium alloy is 25/1000 μm2 or more. This titanium alloy has a high corrosion resistance and capable of keeping a low contact resistance in comparison with conventional titanium alloys having an equivalent platinum group element content.. ... Nippon Steel Corporation

03/29/18 / #20180087096

Gene mutation detection method and fluorescence-labeled oligonucleotide used in same

Provided are techniques by which a mutant gene in a gene group comprising a large number of wild-type genes can be detected with high sensitivity and in a rapid and simple way. Provided is a method for measuring a nucleic acid for the purpose of specifically detecting a genotype as an examination target from subjects which are genes or specimens likely to have a plurality of genetic polymorphisms, wherein the measurement method comprises hybridizing a fluorescent dye-labeled oligonucleotide with a genotype other than the examination target to suppress the gene amplification of such genotype while at the same time, hybridizing the same fluorescence-labeled oligo as described above with an amplification product derived from the genotype of the examination target amplified in the same gene amplification step as described above, and specifically detecting the genotype of the examination target based on a change in the fluorescence intensity of the fluorescent dye before and after the hybridization. ... Nippon Steel Corporation

03/29/18 / #20180086005

Method of joining metal, plastic member, and carbon fiber reinforced plastic member

A method of joining a metal and a plastic member, a method of joining a cfrp member and a plastic member, a method of joining a metal and a cfrp member through a plastic member, in particular a method of joining members able to join members by a faster joining speed and able to give a joined member excellent in joining strength are provided. A method of joining a metal and a plastic member by overlaying a metal and a plastic member and joining them by firing a laser beam from the plastic member side, comprising overlaying the plastic member and glass through which the laser beam will pass on the metal in that order and firing the laser beam from the plastic member side through the glass at a joining location where the metal and the plastic member are overlaid to join them by a joining speed of 0.5 m to 5.0 m/min.. ... Nippon Steel Corporation

03/22/18 / #20180083201

Organic electroluminescent element

. . . . Provided is an organic el device having high efficiency and high driving stability while being driven at a low voltage. The organic electroluminescent device includes one or more light-emitting layers between an anode and a cathode opposite to each other. ... Nippon Steel Corporation

03/22/18 / #20180080106

Stainless steel sheet for exhaust system part use excellent in intermittent oxidation characteristic and exhaust system part

A stainless steel sheet free of surface flaws, having an enhanced high temperature strength and corrosion resistance, not becoming brittle at a high temperature, and further exhibiting a high oxidation resistance enabling it to be suitably used as an inside pipe of a double pipe of an exhaust manifold, a turbocharger part, and other automobile exhaust system parts, which stainless steel sheet has a predetermined composition of chemical components and satisfies cr+20mo≧24.0%, and si+20c+15n≧5.8%. Further, an automobile exhaust system part, excellent in both the oxidation resistances of the base material and weld zone using the above stainless steel sheet, having a gradient of change of sheet thickness between the weld metal and the base material of the above stainless steel sheet of 15 degrees or less.. ... Nippon Steel Corporation

03/22/18 / #20180079879

Fiber-reinforced plastic molding material, method for producing same, and molded article

Provided are an fiber-reinforced plastic molding material having a satisfactory handling property, long storage stability, and high moldability enabling shaping into even a complicated shape, and a molded article thereof having excellent heat resistance, mechanical strength, and a method of producing the same. The fiber-reinforced plastic molding material includes a matrix resin containing, as an essential component, a phenoxy resin being solid at ordinary temperature and having a melt viscosity of 3,000 pa·s or less at anywhere in the temperature region of from 160° c. ... Nippon Steel Corporation

03/22/18 / #20180079026

Method of spot welding

A spot welding method able to simply prevent liquid metal embrittlement cracks in spot welding of plated steel sheets, comprising, before spot welding, removing the plating at least in a zone including the inside of a circle centered at a scheduled location where the center of the nugget is formed and having an outer circumference of the inside of the outer edge of a weld affected zone or a zone at the mated surfaces of the steel sheets to be welded at the inside of a circle sharing a center of a scheduled location becoming the center of the nugget formed at the mated surfaces of the steel sheets and having an outer circumference of the inside of the outer edge of a weld affected zone. . ... Nippon Steel Corporation

03/22/18 / #20180078994

Method for producing forged crankshaft

A method for producing a forged crankshaft includes a die forging step of forming a forged blank having a crankshaft shape by die forging, and a pressing step of pressing the forged blank by a first dies. The forged blank includes first excess portions attached to some or all of crank arms each incorporating a counterweight, each of the first excess portions protrudes from a side portion of the crank arm, in a region near a journal. ... Nippon Steel Corporation

03/22/18 / #20180078986

Press forming method and press forming apparatus

This press forming method is a press forming method of manufacturing a press-formed article from a workpiece sheet using a press forming apparatus including a punch, a die, a punch pad, and a die pad, in which, when the workpiece sheet is clamped between the die and the punch, a surface of the workpiece sheet on a die side in a section between a point in contact with a die bottom end shoulder portion and a point in contact with the die pad is in non-contact with the die and the die pad, and an end surface of a punch side blank holding surface adjacent to a punch shoulder portion is flush with the punch shoulder portion or located on a more inner side of the punch than the punch shoulder portion.. . ... Nippon Steel Corporation

03/15/18 / #20180075177

Method of identification of cause and/or location of cause of occurrence of springback

. . . . . . An apparatus for identification of a cause of occurrence of springback having a press forming analyzer for numerically analyzing forming conditions of press forming to obtain forming data of a press formed part, a springback analyzer for numerically analyzing said forming data to calculate a springback value, and a processor for processing at least one of a physical property value and physical property quantity data of part of the regions of said press formed part among forming data of said press formed part and making said springback analyzer calculate the springback value based on the results of said processing.. . ... Nippon Steel Corporation

03/15/18 / #20180073618

High-strength gear

A gear keeping the bending stress at the dedendum from becoming locally high at the time of power transmission and thereby raising the dedendum bending strength is provided. The radius of curvature is maximum at a critical section position determined by the hofer's 30° tangent method. ... Nippon Steel Corporation

03/15/18 / #20180073111

Age-hardening steel for cold forging use

A cold forged part having a high cold forgeability and having a high endurance ratio due to work hardening by cold forging and age-hardening after cold forging, characterized by having a predetermined chemical composition, having an amount of solute nb/amount of solute v of 0.03 or more and having a structure, by area ratio, of ferrite of 85% or more and a total of bainite and martensite of 5% or less.. . ... Nippon Steel Corporation

03/15/18 / #20180071869

Grain-oriented electrical steel sheet

Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. An average depth d of the groove is greater than 10 μm and equal to or less than 40 μm in a case where the groove is seen on a groove-width-direction cross-section that is perpendicular to a groove extension direction, when a center of the groove in the groove width direction is defined as a groove width center, a deepest portion of the groove deviates from the groove width center toward one side in the groove width direction, and a cross-sectional shape of the groove is asymmetric with respect to the groove width center as a reference in the groove width direction.. ... Nippon Steel Corporation

03/15/18 / #20180071814

Method for producing forged crankshaft

A forged crankshaft production method includes a first preforming step, a second preforming step, and a final preforming step. In the first preforming step, sectional areas of portions to be formed into pins and sectional areas of portions to be formed into journals are decreased, whereby flat portions are formed, and the portion to be formed into the pin located at a second position is decentered. ... Nippon Steel Corporation

03/15/18 / #20180071813

Method for producing forged crankshaft

A forged crankshaft production method includes a first preforming step, a second preforming step, and a final preforming step. The first pair of dies includes web processing parts to come into contact with portions to be formed into arms and portions to be formed into weights integrated with the arms. ... Nippon Steel Corporation

03/08/18 / #20180066380

Method for producing silicon carbide single-crystal ingot and silicon carbide single-crystal ingot

. . The present invention provides a method of raising the rate of reduction of the dislocation density accompanying growth of an sic single crystal to counter the increase in the threading screw dislocations formed near the interface of the seed crystal and grown sic single crystal and thereby produce an sic single-crystal ingot with a small threading screw dislocation density from the initial stage of growth. The present invention is a method for producing a silicon carbide single-crystal ingot growing a silicon carbide single crystal on a growth face of a seed crystal consisting of a silicon carbide single crystal by a physical vapor transport method so as to produce a silicon carbide single-crystal ingot, the method for producing a silicon carbide single-crystal ingot comprising forming step bunching with heights of steps of 10 μm to 1 mm and spans of terraces of 200 μm to 1 mm on the growth face of the seed crystal and making the silicon carbide single crystal grow on the growth face of the seed crystal by the physical vapor transport method.. ... Nippon Steel Corporation

03/08/18 / #20180066335

Ferritic stainless steel sheet which is excellent in workability and method of production of same

Ferritic stainless steel sheet which is excellent in ridging resistance which comprises, by mass %, cr: 10 to 30%, sn: 0.005 to 1%, c: 0.001 to 0.1%, n: 0.001 to 0.1%, si: 0.01 to 3.0%, mn: 0.01 to 3.0%, p: 0.005 to 0.1%, and s: 0.0001 to 0.01% and has a balance of fe and unavoidable impurities and which has an x-ray diffraction strength in the {100}<012> orientation from a surface layer to t/4 (“t” is sheet thickness) of 2 or more.. . ... Nippon Steel Corporation

03/08/18 / #20180066334

Grain-oriented electrical steel sheet

Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. In a case where the groove is seen on a longitudinal groove cross-section including a groove extension direction and the sheet thickness direction, an arithmetic average height ra of a roughness curve, which constitutes a contour of a groove bottom region of the groove, is 1 μm to 3 μm, and an average length rsm of a roughness curve element, which constitutes the contour of the groove bottom region, is 10 μm to 150 μm.. ... Nippon Steel Corporation

03/01/18 / #20180056454

Flux-cored wire for gas shielded arc welding

A flux-cored wire for gas shielded arc welding includes c: 0.03 to 0.09%, si: 0.1 to 0.6%, mn: 1.3 to 3.0%, ti: 0.05 to 0.50%, b: 0.002 to 0.015%, and al2o3 converted value: 0.4 to 1.0%, as the total content in the steel sheath and the flux in mass % relative to the total mass of the wire; and tio2 converted value: 5.0 to 9.0%, sio2 converted value: 0.2 to 0.7%, zro2 converted value: 0.1 to 0.6%, mg: 0.2 to 0.8%, total of f converted value: 0.02 to 0.20%, and total of na2o converted value and k2o converted value: 0.03 to 0.20%; as a content in the flux; in which a content of c in the steel sheath is 0.03% or less in mass % relative to the total mass of the steel sheath.. . ... Nippon Steel Corporation

03/01/18 / #20180056372

Method for producing forged crankshaft

The disclosed production method includes a die forging step of obtaining a forged blank with flash having a crankshaft shape, and a trimming step of removing the flash from the forged blank while nipping the forged blank with a pair of holding dies. In the forged blank, at least one of the rough crank arms have, in a region near an adjacent rough pin, a first excess portion protruding from an outer periphery of a side portion of the rough crank arm. ... Nippon Steel Corporation

03/01/18 / #20180056370

Method of increasing thickness of tube and increased thickness tube

A method of increasing the thickness of a tube which increases a thickness of an end part of a tube without a burr being formed, comprising placing a tube 21 between a die 25 and mandrel 22 in the state with a space for increasing the thickness between a small diameter part 22a of the mandrel 22 and a first end part 21a of a tube 21 and between a large diameter hole part 25c of the die 25 and a second end part 21b of the tube 21, using a first upsetting punch 23 and a second upsetting punch 24 to respectively process the first end part 21a and the second end part 21b of the tube 21, pulling out the mandrel 22 from the tube 31 in the state with the second upsetting punch 24 constraining the second end part 31b of the tube 31, and using the first upsetting punch 23 to push up the first end part 31a of the tube 31 to take out the tube 31 from the die 25.. . ... Nippon Steel Corporation

02/22/18 / #20180053948

Separator for polymer electrolyte fuel cell and method for producing the same

. . There is provided a separator for polymer electrolyte fuel cells having a substrate of a ferritic, having a chemical composition comprising, in mass %, c: 0.001 to 0.012%, si: 0.01 to 0.6%, mn: 0.01 to 0.6%, p: 0.035% or less, s: 0.01% or less, cr: 22.5 to 35.0%, mo: 0.01 to 4.5%, ni: 0.01 to 2.5%, cu: 0.01 to 0.6%, sn: 0.01 to 1.0%, in: 0.001 to 0.30%, n: 0.015% or less, v: 0.01 to 0.35%, and al: 0.001 to 0.050%, and the calculated value of {content of cr (%)+3×content of mo (%)} being 22.5 to 45.0, and includes a surface modified layer containing o: less than 30% and the balance: sn and in. A polymer electrolyte fuel cell including the separator is remarkably excellent in corrosion resistance in an in-cell environment.. ... Nippon Steel Corporation

02/22/18 / #20180050387

Mold for continuous casting

The primary object of the present invention is to provide a mold for continuous casting including a temperature detection unit which can detect the temperature of a copper plate of the mold with high precision, and can be easily inserted into and pulled out of the copper plate. The present invention includes: a main body; and a temperature detection unit which is inserted in an insertion hole in the main body, and detects temperature inside the mold. ... Nippon Steel Corporation

02/15/18 / #20180047997

Titanium product, separator, and proton exchange membrane fuel cell, and method for producing titanium product

. . . . . . A titanium product for a separator of a proton exchange membrane fuel cell according to the present invention includes: a base material that consists of commercially pure titanium; a first oxide layer that is formed in a surface layer of the titanium product, consists of tio2 of a rutile crystallinity, and has a thickness of 0.1 to 1.5 nm; and a second oxide layer that is formed between the base material and the first oxide layer, consists of tiox (1<x<2), and has a thickness of 3 to 20 nm. This titanium product is suitable to be used as a separator of a proton exchange membrane fuel cell that has a high corrosion resistance in an environment in a fuel cell, is capable of keeping a low contact resistance with an electrode consisting of carbon fiber and the like, and is inexpensive.. ... Nippon Steel Corporation

02/15/18 / #20180044757

Age-hardening steel and method of manufacturing parts using age-hardening steel

Age hardening steel excellent in machinability before aging treatment and excellent in fatigue characteristics, toughness, and low cycle fatigue characteristics after aging treatment, that is, age hardening steel containing predetermined amounts of c, si, mn, s, cr, al, v, nb, ca, and rem, limiting contents of p, ti, and n to predetermined amounts or less, having a balance of fe and impurities, having an area ratio of bainite structures of 70% or more, and, furthermore, having a chemical composition where f1 expressed by c+0.3×mn+0.25×cr is 0.68 or more, f2 expressed by c+0.1×si+0.2×mn+0.15×cr+0.35×v is 0.85 or less, f3 expressed by −4.5×c+mn+cr−3.5×v is 0.00 or more, and f4 expressed by 10×ca+rem is 0.012 to 0.08, is provided. Note that, the symbols of elements in the formulas showing f1 to f4 mean the contents by mass % of those elements.. ... Nippon Steel Corporation

02/15/18 / #20180044754

Steel sheet for hot stamping and method for producing steel sheet for hot stamping, and hot stamp formed body

A steel sheet for hot stamping includes a composition including at least, in mass %, c: 0.100% to 0.600%, si: 0.50% to 3.00%, mn: 1.20% to 4.00%, ti: 0.005% to 0.100%, b: 0.0005% to 0.0100%, p: 0.100% or less, s: 0.0001% to 0.0100%, al: 0.005% to 1.000%, and n: 0.0100% or less, with a balance of fe and impurities, surface roughness of the steel sheet satisfies rz>2.5 μm, and 50 mg/m2 to 1500 mg/m2 of coating oil is applied to a surface.. . ... Nippon Steel Corporation

02/15/18 / #20180044749

Hot-rolled steel sheet

A hot-rolled steel sheet includes a predetermined chemical composition, and a structure which include, by area ratio, ferrite and bainite in a range of 80% to 98% in total, and martensite in a range of 2% to 10%, in which in the structure, in a case where a boundary having an orientation difference of equal to or greater than 15° is defined as a grain boundary, and an area which is surrounded by the grain boundary, and has an equivalent circle diameter of equal to or greater than 0.3 μm is defined as a grain, the ratio of the grains having an intragranular orientation difference in a range of 5° to 14° is, by area ratio, in a range of 10% to 60%.. . ... Nippon Steel Corporation

02/15/18 / #20180043412

Burring processing method

In performing burring processing on a sheet-like member, the following processes are performed: a punching process of performing punching processing of the sheet-like member; a hole expansion process of performing hole expansion processing of a punched hole formed by the punching process; a re-punching process of performing punching processing again on a portion surrounding the punched hole expanded by force in the hole expansion process; and a burring process of pushing a portion surrounding a re-punched hole that is a punched hole formed by the re-punching process and forming a vertical wall.. . ... Nippon Steel Corporation

02/08/18 / #20180037980

Hot-rolled steel sheet

. . A hot-rolled steel sheet includes a chemical composition represented by, in mass %, c: 0.010% to 0.100%, si: 0.30% or less, cr: 0.05% to 1.00%, nb: 0.003% to 0.050%, ti: 0.003% to 0.200% and others, wherein a proportion of grains having an intragranular misorientation of 5° to 14° in all grains is 20% or more by area ratio, the grain being defined as an area which is surrounded by a boundary having a misorientation of 15° or more and has a circle-equivalent diameter of 0.3 μm or more.. . ... Nippon Steel Corporation

02/08/18 / #20180037967

Hot-rolled steel sheet

A hot-rolled steel sheet includes a predetermined chemical composition, and a structure which includes, by area ratio, a ferrite in a range of 5% to 60% and a bainite in a range of 30% to 95%, in which in the structure, in a case where a boundary having an orientation difference of equal to or greater than 15° is defined as a grain boundary, and an area which is surrounded by the grain boundary and has an equivalent circle diameter of equal to or greater than 0.3 μm is defined as a grain, the ratio of the grains having an intragranular orientation difference in a range of 5° to 14° is, by area ratio, in a range of 20% to 100%.. . ... Nippon Steel Corporation

02/08/18 / #20180036838

Grain-oriented electrical steel sheet

Provided is a grain-oriented electrical steel sheet including a steel sheet having a steel sheet surface in which a groove, which extends in a direction intersecting a rolling direction and of which a groove depth direction matches a sheet thickness direction, is formed. In a case where the steel sheet surface is seen from the sheet thickness direction, the steel sheet surface is provided with a groove group that is constituted by a plurality of the grooves arranged in a sheet width direction, the grooves, which constitute the groove group, arc arranged in such a manner that adjacent grooves overlap each other on a projection plane perpendicular to the rolling direction, and a plurality of the groove groups are arranged with an interval in the rolling direction.. ... Nippon Steel Corporation

02/01/18 / #20180035493

Eddy current heat generating apparatus

. . . . . . A heat generating apparatus includes a rotary shaft, a heat generating drum, a plurality of permanent magnets, a magnet holding ring, a switching mechanism, and a heat recovery system. The magnets are arrayed in a circumferential direction along the circumference of the rotary shaft throughout the whole circumference such that magnetic pole arrangements of circumferentially adjacent ones of the permanent magnets are opposite to each other. ... Nippon Steel Corporation

02/01/18 / #20180034070

Stainless steel sheet for polymer electrolyte fuel cell separator

A stainless steel sheet used for a separator of a polymer electrolyte fuel cell, wherein the steel sheet has a volume ratio of m2b boride-based metal precipitates of 8% or higher and a volumetric-basis particle-size frequency distribution of m2b boride-based metal precipitates having sphere-equivalent diameters of 6.72 μm or less of 99.5% or higher, in a surface layer which has a depth of 0.2 t from at least one of surfaces (t is an overall thickness of the steel sheet), and the steel sheet has an apparent density of 0.995 or higher, assuming a real density to be 1. A polymer electrolyte fuel cell in which the stainless steel sheet is used for a separator is given an excellent cell performance without high-cost surface treatment such as expensive gold plating for the reduction of the contact resistance of a surface.. ... Nippon Steel Corporation

02/01/18 / #20180034069

Ferritic stainless steel material, separator, polymer electrolyte fuel cell, and method for producing separator

There is provided a ferritic stainless steel material that has a chemical composition comprising, in mass %: c: 0.001 to 0.030%, si: 0.20 to 1.5%, mn: 0.01 to 1.5%, p: 0.035% or less, s: 0.01% or less, cr: 22.5 to 35.0%, mo: 0.01 to 6.0%, ni: 0.01 to 6.0%, cu: 0.01 to 1.0%, sn: 0.10 to 2.5%, in: 0.001 to 1.0%, n: 0.035% or less, v: 0.01 to 0.35%, al: 0.001 to 1.0%, and the balance of fe and inevitable impurities, and the calculated value of {content of cr (mass %)+3×content of mo (mass %)} being 22.5 to 45.0%. A polymer electrolyte fuel cell including a separator for which the steel material is used is remarkably excellent in corrosion resistance in an in-cell environment and has a contact electric resistance the same as that of a gold-plated member.. ... Nippon Steel Corporation

02/01/18 / #20180033529

Electrical steel sheet and method for producing electrical steel sheet

An electrical steel sheet has an insulation coating on a steel sheet surface. The insulation coating includes: a binder consisting of 100 parts by mass of a metal phosphate and 1 to 50 parts by mass of an organic resin having an average particle size of 0.05 to 0.50 μm; and a carboxylic acid-containing compound with a carbon number of 2 to 50 in an amount of 0.1 to 10.0 parts by mass based on 100 parts by mass of solids content of the binder. ... Nippon Steel Corporation

02/01/18 / #20180032654

Break prediction method, break prediction device, program, recording medium, and break discernment standard calculation method

A break prediction method according to the present invention predicts a break of a joint portion of an object to be analyzed including a pair of members joined to each other by using a finite element method, and includes a first step of acquiring at least an element size of a base material portion, from among parameters set in an element model for the object to be analyzed; a second step of calculating, as a break discernment standard, a break limit moment defined by a function including the element size of the base material portion as a variable; and a third step of discerning whether the moment applied to the joint portion in a deformation analysis of the element model for the object to be analyzed exceeds the break limit moment, and outputting the result of the discernment as a break prediction result for the joint portion.. . ... Nippon Steel Corporation

02/01/18 / #20180032057

Blank shape determining method, blank, press formed product, press forming method, computer program, and recording medium

A blank shape determining method includes: a process of making a forming analysis of forming a reference blank into a reference formed product and a acquiring sheet thickness distribution and a plastic strain distribution; a process of acquiring a forming failure evaluation index for the reference blank; a process of estimating a region, which includes an end edge portion at which the forming failure evaluation index exceeds a predetermined threshold, within the reference blank as a forming failure region; a process of generating a plurality of corrected blanks; a process of making a forming analysis of forming the corrected blanks into corrected formed products and acquiring a sheet thickness distribution and a plastic strain distribution; a process of acquiring the forming failure evaluation index for the corrected formed product; and a process of determining a shape of the corrected blank having a smallest maximum value of the forming failure evaluation index as a shape of a blank provided for press forming.. . ... Nippon Steel Corporation

02/01/18 / #20180031169

Inexpensive automobile component and oil feed pipe having excellent salt corrosion resistance

An automotive member or oil filler pipe includes: a member of ferritic stainless steel containing, in mass %, at most 0.015% of c, at most 0.015% of n, 10.5 to 18.0% of cr, 0.01 to 0.80% of si, 0.01 to 0.80% of mn, at most 0.050% of p, at most 0.010% of s, 0.010 to 0.100% of al, more than 0.3 to 1.5% of mo, and one or both of 0.03 to 0.30% of ti and nb; and a metal fitting of an aluminized stainless steel sheet, which is attached to the member to define therebetween a gap structure to be exposed to a chloride environment, and has an al-plating weight per unit area ranging from 20 to 150 g/m2 in the gap structure. Surfaces of the metal fitting and member not facing the gap are coated with a cation electrodeposition coating film having a thickness of 5 to 35 μm.. ... Nippon Steel Corporation

02/01/18 / #20180030566

High-strength austenitic stainless steel having excellent hydrogen embrittlement resistance characteristics and method for producing same

This high-strength austenitic stainless steel having excellent hydrogen embrittlement resistance characteristics includes, by mass %, c: 0.2% or less, si: 0.3% to 1.5%, mn: 7.0% to 11.0%, p: 0.06% or less, s: 0.008% or less, ni: 5.0% to 10.0%, cr: 14.0% to 20.0%, cu: 1.0% to 5.0%, n: 0.01% to 0.4%, and 0: 0.015% or less, with the balance being fe and unavoidable impurities, wherein an average size of cr-based carbonitrides is 100 nm or less, and an amount of the cr-based carbonitrides is 0.001% to 0.5% in terms of % by mass.. . ... Nippon Steel Corporation

02/01/18 / #20180030068

Material for organic electroluminescent element and organic electroluminescent element in which same is used

Provided are an organic electroluminescent device (organic el device) that is improved in luminous efficiency, sufficiently secures driving stability, and has a simple construction, and a material for an organic el device to be used in the device. The material for an organic el device includes a carborane compound represented by the general formula (1), and the carborane compound has a structure in which a six-membered ring group containing at least two nitrogen atoms is bonded to a carborane ring. ... Nippon Steel Corporation

02/01/18 / #20180029166

Fillet welded joint and method of production of same

The present invention provides a fillet welded joint and a method of production of a fillet welded joint which can raise the productivity of the method of production of a fillet welded joint and a fillet welded joint without sacrificing the strength against fatigue fracture of the welded structural member. The fillet welded joint of the present invention is a fillet welded joint formed by fillet welding at least two metal members, wherein, on the surface of at least one of the metal members, the fillet welded joint comprises a press bead of a rib-shaped projection provided by press-forming so as to project upward to the side having a weld bead formed by the fillet welding, and part of the press bead contacts or overlaps the weld bead.. ... Nippon Steel Corporation

01/25/18 / #20180023179

Method for producing plug

. . A method for producing a plug includes: a step of preparing a plug base metal having a concave portion along a circumferential direction in an outer peripheral surface; and an arc spraying step of spraying a spraying wire rod material onto the outer peripheral surface of the plug base metal by arc spraying to form films containing fe and fe oxides on the outer peripheral surface of the plug base metal. The arc spraying step includes: a separating step of separating the outer peripheral surface of the plug base metal into a plurality of regions along an axial direction; and a step of performing arc spraying separately in each of the regions. ... Nippon Steel Corporation

01/25/18 / #20180023172

Steel sheet

A steel sheet includes: a base iron; a scale of 10.0 μm or less in thickness on a surface of the base iron; a subscale between the base iron and the scale. In the subscale, an average value of cr concentrations is 1.50 mass % to 5.00 mass %, and one part or more exist(s) where a ratio of cr concentrations between two adjacent measurement regions separate by 1 μm is 0.90 or less or 1.11 or more in a range of 50 μm in length in a rolling direction. ... Nippon Steel Corporation

01/25/18 / #20180023162

Hot-rolled steel sheet

A hot-rolled steel sheet includes a predetermined chemical composition, and a structure which includes, by area ratio, ferrite and bainite in a range of 75% to 95% in total, and martensite in a range of 5% to 20%, in which in the structure, in a case where a boundary having an orientation difference of equal to or greater than 15° is set as a grain boundary, and an area which is surrounded by the grain boundary, and has an equivalent circle diameter of equal to or greater than 0.3 μm is defined as a grain, the ratio of the grains having an intragranular orientation difference in a range of 5° to 14° is, by area ratio, in a range of 10% to 60%.. . ... Nippon Steel Corporation

01/25/18 / #20180023155

Cold-rolled steel sheet and method of manufacturing same

In a cold-rolled steel sheet having a predetermined chemical composition, a metallographic structure contains 40.0% or more and less than 60.0% of a polygonal ferrite, 30.0% or more of a bainitic ferrite, 10.0% to 25.0% of a residual austenite, and 15.0% or less of a martensite, by an area ratio, in the residual austenite, a proportion of the residual austenite in which an aspect ratio is 2.0 or less, a length of a long axis is 1.0 μm or less, and a length of a short axis is 1.0 μm or less, is 80.0% or more, in the bainitic ferrite, a proportion of the bainitic ferrite in which an aspect ratio is 1.7 or less and an average value of a crystal orientation difference in a region surrounded by a boundary in which a crystal orientation difference is 15° or more is 0.5° or more and less than 3.0°, is 80.0% or more, and a connection index d value of the martensite, the bainitic ferrite, and the residual austenite is 0.70 or less.. . ... Nippon Steel Corporation

01/25/18 / #20180022927

Electrical steel sheet

An electrical steel sheet has an insulating coating on a steel sheet surface. The insulating coating includes one or more selected from an inorganic salt, an oxide, and an organic resin. ... Nippon Steel Corporation

01/25/18 / #20180021835

Method of forming metal sheet and formed part

A method of forming which forms a metal sheet so that it does not break without changing the material of the metal sheet and the forming process, comprising bonding a reinforcement to part of the metal sheet and then forming the metal sheet.. . ... Nippon Steel Corporation

01/25/18 / #20180021829

Formed metal item including tubular part with slit, method for producing the same, and producing device and die assembly used in method for producing the same

A producing method to be disclosed is a producing method for producing a formed metal item that includes a tubular part with a slit. This producing method includes a step (i) of forming u-shaped part having a u-shaped cross section by deforming a metal plate, and a step (ii) of forming the tubular part with the slit by deforming the u-shaped part using a die assembly with a protruding part in such a manner that two end parts of the u-shaped part clamp the protruding part. ... Nippon Steel Corporation

01/18/18 / #20180017190

Metal pipe having thickened end portion, and method of manufacturing same

. . A metal pipe having a thickened end portion, the metal pipe includes: when viewed in a longitudinal direction of the metal pipe, a thin portion which has a thickness t0; a first thickened portion which is provided on one end and has a thickness t which is larger than the thickness t0; and a first taper portion which is provided between the thin portion and the first thickened portion and has the thickness which gradually increases from t0 to t; when a hardness of an inner surface of the first thickened portion is measured in a circumferential direction and the hardness is plotted with respect to a position in the circumferential direction, in which a waveform representing a high hardness portion having a hardness which is 95% or more of a maximum hardness in the circumferential direction and a waveform representing a low hardness portion having a hardness which is less than 95% of the maximum hardness alternately appear, and a plurality of combinations of the waveform representing the high hardness portion and the waveform representing the low hardness portion appear.. . ... Nippon Steel Corporation

01/18/18 / #20180016655

Ferritic stainless steel for exhaust system member having excellent corrosion resistance after heating

A ferritic stainless steel for exhaust system components excellent in corrosion resistance after heating includes: 0.015 mass % or less of c; 0.02 mass % or less of n; 0.03 mass % to 1.0 mass of si; 1.0 mass of mn; 0.04 mass of p; 0.01 mass of s; 10.5 mass % to 22.5 mass of cr; 0.02 mass % to 0.5 mass of sn; 0.003 mass % to 0.2 mass of al; one or both of 0.03 mass % to 0.35 mass of ti and 0.03 mass % to 0.6 mass of nb; and a remnant comprising fe and inevitable impurities, wherein a grain size number on a surface of the ferritic stainless steel is 6 to 2 to 15 nm of a layer containing sn at a concentration twice or more of sn content in the base material is formed on the ferritic stainless steel.. . ... Nippon Steel Corporation

01/18/18 / #20180016189

Insulating monolithic refractory material

An insulating monolithic refractory material having sufficient curing strength and usable time ensured and exhibiting excellent stability at high temperature. The insulating monolithic refractory material comprises a binder and a refractory raw material; a bulk specific gravity thereof is 0.8 to 1.8 when a kneaded mixture of the insulating monolithic refractory material with water is cured at normal temperature for 24 hours and then dried at 110° c. ... Nippon Steel Corporation

01/18/18 / #20180015535

Titanium cast product for hot rolling unlikely to exhibit surface defects and method of manufacturing the same

Provided is a titanium cast product for hot rolling made of a titanium alloy, the titanium cast product including a melted and resolidified layer in a range of more than or equal to 1 mm in depth on a surface serving as a rolling surface, the melted and resolidified layer being obtained by adding one or more elements out of any one of or both of at least one α stabilizer element and at least one neutral element to the surface, and melting and resolidifying the surface. An average value of a total concentration of at least one α stabilizer element and at least one neutral element in the range of more than or equal to 1 mm in depth is higher than a total concentration of at least one α stabilizer element and at least one neutral element in a base metal by, in mass %, more than or equal to 0.1% and less than 2.0%.. ... Nippon Steel Corporation

01/18/18 / #20180015533

Method for continuously casting slab

To provide a continuous casting method according to which a slab difficult for surface cracking to appear can be manufactured, in a first water cooling step, the slab is cooled so that only a surface temperature of corner parts is below ar3 point, in a first recuperation step, the slab is recuperated so that the surface temperature of all the slab including the corner parts is no less than the ar3 point, in a second water cooing step, the slab is cooled so that the surface temperature of all the slab including the corner parts is below the ar3 point, and in a second recuperation step, the slab is recuperated so that the surface temperature of only a portion of the slab other than the corner parts is no less than the ar3 point.. . ... Nippon Steel Corporation

01/11/18 / #20180012690

Oxide superconducting bulk magnet

. . . . An oxide superconducting bulk magnet able to prevent breakage of a superconducting bulk member and able to give a sufficient amount of total magnetic flux at a superconducting bulk member surface even under high magnetic field strength conditions, comprising an oxide superconducting bulk laminate formed from sheet-shaped oxide superconducting bulk members and high strength reinforcing members arranged between the stacked oxide superconducting bulk members, the outer circumference of the oxide superconducting bulk laminate being provided with an outer circumference reinforcing member.. . ... Nippon Steel Corporation

01/04/18 / #20180004873

Surface shape defect generating region estimating method, surface shape defect source region estimating method, surface shape defect generating region estimating device, surface shape defect source region estimating device, program, and recording medium

There is provided a surface shape defect generating region estimating method for estimating a generating region of a surface shape defect of a deformation-processed product obtained by performing deformation processing with respect to a workpiece, the method including: a first stress distribution obtaining process of obtaining first stress distribution σt1; a second stress distribution obtaining process of obtaining a second stress distribution σ(t2); a comparative stress distribution obtaining process of obtaining comparative stress distribution σ(t1, t2); a division comparative stress distribution obtaining process of obtaining division comparative stress distribution σ(t1, t2); and a surface shape defect generating region estimating process of estimating whether or not each of the divided regions dk is a generating region of the surface shape defect.. . ... Nippon Steel Corporation

01/04/18 / #20180002813

Steel sheet for a fuel tank

A steel sheet for a fuel tank according to the present invention includes: a zn—ni alloy plated layer placed on one surface or each of both surfaces of a base metal; and a chromate-free chemical conversion coating film which is placed over the zn—ni alloy plated layer. The zn—ni alloy plated layer has a crack starting from an interface with the chromate-free chemical conversion coating film and reaching an interface with the steel sheet, the chromate-free chemical conversion coating film consists of an organosilicon compound consisting of a condensation polymer of a silane coupling agent, a phosphoric acid compound and/or a phosphonic acid compound, a vanadium compound, and a titanium compound and/or a zirconium compound, and a concentration of a total of amounts in terms of metal, per surface, of the phosphoric acid compound and/or the phosphonic acid compound+the vanadium compound+the titanium compound and/or the zirconium compound, is 5 mass % to 20 mass %.. ... Nippon Steel Corporation

01/04/18 / #20180002776

Non-oriented electrical steel sheet and method for manufacturing thereof

A non-oriented electrical steel sheet includes c: 0 to 0.0050 mass %, si: 0.50 to 2.70 mass %, mn: 0.10 to 3.00 mass %, al: 1.00 to 2.70 mass %, and p: 0.050 to 0.100 mass %. In the non-oriented electrical steel sheet, al/(si+al+0.5×mn) is 0.50 to 0.83, si+al/2+mn/4+5×p is 1.28 to 3.90, si+al+0.5×mn is 4.0 to 7.0, the ratio of the intensity of {100} plane i{100} to the intensity of {111} plane i{111} is 0.50 to 1.40, the specific resistance is 60.0×10−8 Ω·m or higher at room temperature, and the thickness is 0.05 mm to 0.40 mm.. ... Nippon Steel Corporation

01/04/18 / #20180001853

Bumper beam

A bumper beam includes a first member, a second member, and an inner plate. The first member includes a top plate section, two vertical wall sections, and two flange sections. ... Nippon Steel Corporation

01/04/18 / #20180001368

Panel-shaped formed product and method for producing panel-shaped formed product

A panel-shaped formed product made of a metal sheet includes a top panel portion, an opening portion, and a vertical wall portion. The top panel portion is polygonal. ... Nippon Steel Corporation

12/28/17 / #20170369979

High-strength hot-dip galvanized steel sheet and high-strength alloyed hot-dip galvanized steel sheet having excellent plating adhesion, formability, and hole expandability with tensile strength of 980 mpa or more and manufacturing method therefor

Provided is a high-strength hot-dip galvanized steel sheet having excellent plating adhesion, formability, and hole expandability with an ultimate tensile strength of 980 mpa or more, the hot-dip galvanized steel sheet comprising a hot-dip galvanized layer formed on a surface of a base steel sheet. The base steel sheet contains, by mass %, c: 0.05% to 0.4%; si: 0.01% to 3.0%; mn: 0.1% to 3.0%; al: 0.01 to 2.0%; in which si+al>0.5%, p: limited to 0.04% or less; s: limited to 0.05% or less; n: limited to 0.01% or less; and a balance including fe and inevitable impurities, a microstructure of the base steel sheet contains 40% or more by total volume fraction of martensite and bainite, 8% or more by volume fraction of residual austenite, and a balance of the microstructure being ferrite or ferrite and 10% or less by volume fraction of pearlite. ... Nippon Steel Corporation

12/28/17 / #20170369975

Rail

The present invention relates to a rail which has a predetermined chemical composition and satisfies expressions of 1.00<mn/cr≦4.00 and 0.30≦0.25×mn+cr≦1.00 and in which a structure to a depth of 25 mm from an outer surface of a head portion as the origin includes 95% or greater of a pearlite structure, the hardness of the structure is in a range of hv 350 to 480, 50 to 500 v carbonitride having an average grain size of 5 to 20 nm are present per 1.0 μm2 of an area to be inspected in a transverse cross section at a position having a depth of 25 mm from the outer surface of the head portion, and the value obtained by subtracting the hardness of the position having the depth of 25 mm from the outer surface of the head portion from the hardness of the position having a depth of 2 mm from the outer surface of the head portion is in a range of hv 0 to hv 40.. . ... Nippon Steel Corporation

12/28/17 / #20170369964

Hot-rolled steel sheet and manufacturing method thereof, and manufacturing method of cold-rolled steel sheet

A si/mn ratio of steel material components of a base material is not less than 0.27 nor more than 0.90 in mass ratio, an internal oxide layer having a thickness of not less than 1 μm nor more than 30 μm is provided right below an oxide scale of a steel sheet surface layer portion, and regarding the internal oxide layer, an internal oxide in a crystal grain of the internal oxide layer is an oxide containing si and having a thickness of not less than 10 nm nor more than 200 nm in a crystal grain in a range of greater than 0% and 30% or less of a thickness of the internal oxide layer from an interface between the internal oxide layer and base iron toward a direction of the surface layer oxide scale, one or more branches of the internal oxide exist in a cross section of 1 μm×1 μm square, and in any crystal grain boundary having a length of 1 μm, one or more of the internal oxides in the crystal grain are connected to an internal oxide of the crystal grain boundary to form a net-like structure.. . ... Nippon Steel Corporation








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