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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


 new patent  Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

 new patent  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

 new patent  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

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

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

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

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

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

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

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

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

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

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

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 / #a bonding wire for a semiconductor device, characterized in that the bonding wire includes a cu alloy core material and a pd coating layer formed on a surface of the cu alloy core material, the bonding wire contains an element that provides bonding reliability in a high-temperature environment, and a strength ratio defined by the following equation (1) is 1.1 to 1.6:

Nippon Steel & Sumikin Materials Co., Ltd.

. . ... 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 / #[object] to provide a shape measurement apparatus that, in measuring the unevenness shape of a measurement object by a light-section method, enables the shape of the measurement object to be measured precisely even when the distance between the measurement object and an image capturing apparatus fluctuates.

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

04/19/18 / #[object] to measure the surface height of a rigid body to be measured more accurately even if any one of three types of disturbance of translation in the height direction, rotation around the longitudinal-direction axis, and rotation around the width-direction axis has occurred during conveyance.

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

04/19/18 / #[object] to enable flexible molding of a punch-nose in press working for obtaining a molded product including a u-shaped portion in a cross-section.

Nippon Steel & Sumitomo Metal Corporation

. . ... 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 / #a hot-rolled steel sheet according to the present embodiment has a chemical composition containing, in mass %: c: 0.07 to 0.30%, si: more than 1.0 to 2.8%, mn: 2.0 to 3.5%, p: 0.030% or less, s: 0.010% or less, al: 0.01 to less than 1.0%, n: 0.01% or less, o: 0.01% or less, and one or more types selected from the group consisting of sb, sn and te in a total amount of 0.03 to 0.30%, with a balance being fe and impurities, and satisfying formula (1). the micro-structure of the hot-rolled steel sheet includes ferrite and pearlite in a total amount of 50 area % or more. the tensile strength of the hot-rolled steel sheet is 900 mpa or less.

Nippon Steel & Sumitomo Metal Corporation

. . ... 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 / #[object] to perform shape inspection of a metallic body in a simple way at higher speed with higher density.

Nippon Steel & Sumitomo Metal Corporation

. . ... 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 / #disclosed is an absorbing liquid for separating and capturing carbon dioxide from a carbon dioxide-containing gas, the absorbing liquid containing: at least one alkanolamine represented by formula (1)

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

03/22/18 / #[object] to provide a hot-dip zinc-based plated steel sheet excellent in coating film adhesiveness after hot pressing more conveniently.

Nippon Steel & Sumitomo Metal Corporation

. . ... 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 / #the present invention provides a hot-rolled steel sheet capable of preventing softening of the strength of a sheet-thickness central portion of the steel sheet in thermal treatment, even in the case where an amount of working performed on the steel sheet is small and a work hardening rate is low.

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

03/15/18 / #[object] to provide a plated steel sheet excellent in heat resistance and productivity and a method for producing the same.

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

03/15/18 / #[object] to produce an h-shaped steel product with a flange width larger than a conventional flange width by, in a rough rolling step using calibers in producing h-shaped steel, creating deep splits on end surfaces of a material (e.g., slab) using projections with acute-angle tip shapes, and sequentially bending flange portions formed by the splits.

Nippon Steel & Sumitomo Metal Corporation

. . ... 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 / #a carbon material for catalyst carrier use excellent in both durability and power generation performance under operating conditions at the time of low humidity, in particular both durability of a carbon material for catalyst carrier use with respect to repeated load fluctuations due to startup and shutdown and power generation performance under operating conditions at the time of low humidity, and a catalyst for solid-polymer fuel cell use prepared using the same etc. are provided.

Nippon Steel & Sumikin Chemical Co., Ltd.

. . ... 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 / #[object] to provide a hot-dip zinc-based plated steel sheet which suppresses excessive production of zinc oxides on an outer layer after hot pressing more conveniently and is excellent in corrosion resistance at an uncoated portion.

Nippon Steel & Sumitomo Metal Corporation

. . ... 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 / #to provide a ferritic stainless steel sheet which has high scale spalling even at a high temperature around 1000° c. provided is a ferritic stainless steel sheet having excellent mn-containing oxide film-forming ability and scale spalling ability, containing, in terms of mass %: c: 0.001 to 0.020%, n: 0.001 to 0.020%, si: 0.10 to 0.40%, mn: 0.20 to 1.00%, cr: 16.0 to 20.0%, nb: 0.30 to 0.80%, mo: 1.80 to 2.40%, w: 0.05 to 1.40%, cu: 1.00 to 2.50%, and b: 0.0003 to 0.0030%, in which the above-mentioned components are contained satisfying the formula (1) below, and the balance is composed of fe and inevitable impurities. at least one of n, al, v, mg, sn, co, zr, hf, and ta may be added in a predetermined content range.

Nippon Steel & Sumikin Stainless Steel Corporation

. . ... Nippon Steel Corporation

02/15/18 / #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. when an average value of a groove depth in a sheet thickness direction at a central portion of the groove in a longitudinal groove direction is set as an average groove depth d, a straight line, which connects a first point at which a groove depth in the sheet thickness direction becomes 0.05×d and a second point at which the groove depth becomes 0.50×d, at an inclined portion of the groove is set as a groove end straight line, an angle made by the steel sheet surface and the groove end straight line is set as a first angle θ, and an average value of a groove-width-direction length, which is a length of a line segment connecting two points at which a groove depth in the sheet thickness direction in a contour of the groove on the groove-width-direction cross-section becomes 0.05×d, is set as an average groove width w, an aspect ratio a obtained by dividing the average groove depth d by the average groove width w, and the first angle θ satisfy the following expression (1).

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

02/15/18 / #[object] to provide a zinc-based plated steel sheet excellent in coating film adhesiveness after hot pressing more conveniently.

Nippon Steel & Sumitomo Metal Corporation

. . ... 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 / #a stainless steel exhibiting an excellent brazeability includes in mass %: c: from 0.001% to 0.1%; si: from more than 1.5% to 4.0%; mn: from 0.05% to 4.0%; cr: from 10.5% to 30%; ni: 35% or less; n: from 0.001% to 0.4%; one or both of ti: 0.002% to 0.030% and al: 0.002% to 0.10%; and a balance being fe and inevitable impurities, in which an si content, a ti content and an al content satisfy formula 1, and an oxide film with a composition satisfying formula 2 is formed on a surface of the stainless steel,

Nippon Steel & Sumikin Stainless Steel Corporation

. . ... 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 / #a conductive joining material and conductive joined structure for joining two joining members by a joining layer using metal nanoparticles at the time of which even if there is a difference in the amounts of heat expansion due to a difference in linear thermal expansion coefficients between these two joining members and further use at a high temperature is sought, it is possible to adjust the amount of heat expansion of the joining layer to a suitable value between the two joining members to ease the thermal stress occurring at the joining layer and possible to sufficiently hold the joint strength between the two joining members are provided.

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

02/01/18 / #a ball bearing not allowing locations where the surface pressure becomes locally higher at a race at the time of a high load and thereby keeping cracking from occurring and in turn realizing a longer lifespan is provided. a pair of races (12, 14) and at least one rolling element (16) movably clamped between the pair of races move are provided. a cross-sectional profile line (14a) of a part of each of the pair of races contacting the rolling element has the smallest radius of curvature at a position (p) sticking out the most in the first direction (d1) over which the pair of races face. the cross-sectional profile line becomes larger in radius of curvature the further from the position (p) in a second direction (d2) vertical to the first direction (d1) in the cross-section. the cross-sectional profile line is comprised of a single function. when a midpoint of the profile line in the second direction is the origin, an axis extending in the second direction is the x-axis and the axis extending in the first direction is the y-axis, and a radius of the rolling element is (r), the cross-sectional profile line satisfies equation (1):

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

02/01/18 / #[object] to provide a zinc-based plated steel sheet excellent in coating adhesiveness after hot pressing more conveniently.

Nippon Steel & Sumitomo Metal Corporation

. . ... 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 / #there is provided a method of manufacturing a tooth-shaped component including drawing process of draw-forming a workpiece so as to obtain a cylindrical container which has a bottom surface portion and a side surface portion; diameter-reducing process of reducing a diameter of a particular part in which a tooth tip portion is to be formed in the side surface portion of the cylindrical container, so as to increase a thickness of a corner portion such that an external shape of the corner portion between the bottom surface portion and the side surface portion satisfies the following conditional expression (1); and tooth shape-forming process of forming the tooth tip portion in the particular part of the cylindrical container reduced in diameter in the diameter-reducing process, so as to obtain a tooth-shaped component which has the bottom surface portion, the side surface portion, and the tooth tip portion.

Nippon Steel & Sumitomo Metal Corporation

. . ... 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 / #a steel wire for a non heat-treated mechanical part includes, as a chemical composition, by mass %, a predetermined amount of c, si, mn, cr, mo, ti, al, b, nb, and v, and limited p, s, n, and o and a remainder of fe and impurities; in which a structure includes, by volume %, a bainite of greater than or equal to 75×[c %]+25, and a remainder of one or more of a ferrite and a pearlite when an amount of c is set to [c %] by mass %; when an average aspect ratio of a bainite block in a second surface layer area of the steel wire is set as r1, the r1 is greater than or equal to 1.2; when an average grain size of a bainite block in a third surface layer area of the steel wire is set to ps3 μm, and an average grain size of a bainite block in a third center portion of the steel wire is set to pc3 μm, the ps3 satisfies expression (c), and the ps3 and the pc3 satisfy expression (d), a standard deviation of a grain size of the bainite block in the structure is less than or equal to 8.0 μm; and a tensile strength is in a range of 800 mpa to 1600 mpa,

Nippon Steel & Sumitomo Metal Corporation

. . ... 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 / #a primary object of the present invention is to provide a technique of avoiding occurrence of surface defects caused by an electromagnetic brake while checking internal defects with this electromagnetic brake, so that cleanliness of a cast steel can be improved compared with prior arts, and the present invention provides a method for continuously casting steel, the method comprising supplying molten steel into a mold while applying an electromagnetic brake to an outlet flow discharged from an outlet port of an immersion nozzle, wherein magnetic flux density (b) of the electromagnetic brake is within a range of the following (formula 1):

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

01/11/18 / #a method for producing a press-formed product that includes a pair of flat sections and a bend section that connects the flat sections, in which a bending radius of the bend section is r2 and an interior angle formed by the pair of flat sections is θ2, includes the steps bellow. in the first forming step, an intermediate formed product including a bend section in which a bending radius is r1 and an interior angle is θ1 is formed. in the second forming step, a portion of a bend section of the intermediate formed product is formed into the bend section of the press-formed product. r1, θ1, r2 and θ2 satisfy the conditions of formulae (1) to (3) below:

Nippon Steel & Sumitomo Metal Corporation

. . ... 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

12/28/17 / #20170369961

Rail

The present invention relates to a rail which has a predetermined chemical composition and in which at least 90% of a metallographic structure from an outer surface of the rail bottom portion, as the origin, to a depth of 5 mm is a pearlite structure, a surface hardness hc of a foot-bottom central portion is in a range of hv 360 to 500, a surface hardness he of a foot-edge portion is in a range of hv 260 to 315, and hc, he, and a surface hardness hm of a middle portion positioned between the foot-bottom central portion and the foot-edge portion satisfy hc≧hm≧he.. . ... Nippon Steel Corporation

12/21/17 / #20170365463

Epitaxial silicon carbide single crystal wafer and process for producing the same

An epitaxial silicon carbide single crystal wafer having a small depth of shallow pits and having a high quality silicon carbide single crystal thin film and a method for producing the same are provided. The epitaxial silicon carbide single crystal wafer according to the present invention is produced by forming a buffer layer made of a silicon carbide epitaxial film having a thickness of 1 μm or more and 10 μm or less by adjusting the ratio of the number of carbon to that of silicon (c/si ratio) contained in a silicon-based and carbon-based material gas to 0.5 or more and 1.0 or less, and then by forming a drift layer made of a silicon carbide epitaxial film at a growth rate of 15 μm or more and 100 μm or less per hour. ... Nippon Steel Corporation

12/21/17 / #20170362732

Surface treated steel sheet for fuel tank

Provided is a surface treated steel sheet for a fuel tank, the surface treated steel sheet including: a zn plated layer or a zn—ni alloy plated layer which is formed on at least a surface of the steel sheet to be an inner surface of the fuel tank; and a chromate-free chemical conversion coating layer containing a water-and-oil repellent, the chromate-free chemical conversion coating layer being placed over the zn plated layer or the zn—ni alloy plated layer on the surface to be the inner surface of the fuel tank. A water contact angle on a surface of the chromate-free chemical conversion coating layer is more than or equal to 70 degrees and an n-hexadecane contact angle on the surface of the chromate-free chemical conversion coating layer is more than or equal to 30 degrees and less than or equal to 70 degrees.. ... Nippon Steel Corporation

12/21/17 / #20170362686

Beta-type titanium alloy

The present invention provides a β-type titanium alloy that includes, by mass %, when al: 2 to 5%, 1) fe: 2 to 4%, cr: 6.2 to 11%, and v: 4 to 10%, 2) fe: 2 to 4%, cr: 5 to 11%, and mo: 4 to 10%, or 3) fe: 2 to 4%, cr: 5.5 to 11%, and mo+v (total of mo and v): 4 to 10% in range, and a balance of substantially ti. These include zr added in amounts of 1 to 4 mass %. ... Nippon Steel Corporation

12/21/17 / #20170362674

Low-alloy steel for oil well pipe and method of manufacturing low-alloy steel oil well pipe

A low-alloy steel has a composition including, by mass %, c: more than 0.45 and up to 0.65%; si: 0.05 to 0.50%; mn: 0.10 to 1.00%; p: up to 0.020%; s: up to 0.0020%; cu: up to 0.1%; cr: 0.40 to 1.50%; ni: up to 0.1%; mo: 0.50 to 2.50%; ti: up to 0.01%; v: 0.05 to 0.25%; nb: 0.005 to 0.20%; al: 0.010 to 0.100%; b: up to 0.0005%; ca: 0 to 0.003%; 0: up to 0.01%; n: up to 0.007%; and other elements. A microstructure consists of tempered martensite and retained austenite<2% in volume fraction, crystal grain size number being 9.0 or larger, number density of carbonitride-based inclusions with grain diameter of 50 μm or larger being 10 inclusions/100 mm2 or smaller, and yield strength being 965 mpa or higher.. ... Nippon Steel Corporation

12/21/17 / #20170361571

Steel sheet for a fuel tank

A steel sheet for a fuel tank includes: a zn—ni alloy plated layer which is placed on one surface or each of both surfaces of a base metal and formed on at least one surface; and an inorganic 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 between the zn—ni alloy plated layer and the inorganic chromate-free chemical conversion coating film and reaching an interface between the zn—ni alloy plated layer and the steel sheet, and a water contact angle on a surface of the inorganic chromate-free chemical conversion coating film is more than or equal to 50 degrees.. ... Nippon Steel Corporation

12/14/17 / #20170356076

Titanium alloy member and method for manufacturing the same

There is provided a titanium alloy member including a base metal portion, and an outer hardened layer formed on an outer layer of the base metal portion, the cross sectional hardness of the base metal portion is 330 hv or higher and lower than 400 hv, the cross sectional hardnesses at positions 5 μm and 15 μm from the surface of the outer hardened layer are 450 hv or higher and lower than 600 hv, the outer hardened layer includes an oxygen diffusion layer and a nitrogen diffusion layer, the oxygen diffusion layer is at a depth of 40 to 80 μm from the surface of the outer hardened layer, and the nitrogen diffusion layer is at a depth of 2 to 5 μm from surface of the outer hardened layer. This titanium alloy member includes an outer hardened layer, is high in cross sectional hardness of the base metal portion, and is excellent in fatigue strength and wear resistance.. ... Nippon Steel Corporation

12/07/17 / #the present invention focuses on sn and has as its problem to not only improve the corrosion resistance and rust resistance of cr-containing ferritic stainless steel but also improve the ridging resistance. the present invention derives the relationship between ap, which shows the γ-phase rate at 1100° c. due to a predetermined ingredient, and sn in ferritic stainless steel which becomes a dual phase structure of α+γ in the hot rolling temperature region, applies and adds sn, and hot rolls the steel to give a total rolling rate of 15% or more in 1100° c. or higher hot rolling to thereby obtain ferritic stainless steel sheet which has good ridging resistance, which also has excellent corrosion resistance and rust resistance, and which can be applied to general durable consumer goods:

Nippon Steel & Sumikin Stainless Steel Corporation

. . ... Nippon Steel Corporation

12/07/17 / #[object] there is provided a long structural member made of metal, which has a substantially gutter-shaped cross section and is excellent in load transfer properties when an impact load is applied.

Nippon Steel & Sumitomo Metal Corporation

. . ... Nippon Steel Corporation

12/07/17 / #20170352890

Electrode for metal-air battery

The present invention provides a novel and improved metal-air battery in which a lot of catalyst can be disposed in a triple phase boundary, and further, battery properties can be improved. In the metal-air battery according to the present invention, a catalyst layer of an air electrode of a metal-air battery contains a catalyst element and a carbon material, the carbon material comprises two materials of a carbon material a supporting thereon the catalyst element and a carbon material b not supporting the catalyst element, the catalyst layer comprises an agglomerate x containing the catalyst element, the carbon material a and the carbon material b as main components and an agglomerate y containing the carbon material b as a main component, and the agglomerate x is a continuum and the agglomerate y is dispersed in the agglomerate x.. ... Nippon Steel Corporation

12/07/17 / #20170350434

Laser welded joint, vehicle component, manufacturing method of laser welded joint, and manufacturing method of vehicle component

A laser welded joint has weld metal provided between a plurality of steel sheets. A chemical composition of the weld metal has predetermined components, and average hardness of the weld metal is 350 to 540 in vickers hardness. ... Nippon Steel Corporation

12/07/17 / #20170349982

Steel material and expandable oil country tubular goods

There is provided a steel material having a chemical composition consisting, by mass percent, of c: 0.6-1.8%, si: 0.05-1.00%, mn: >25.0-45.0%, al: 0.003-0.06%, p: ≦0.03%, s: ≦0.03%, cu: 0.5-3.0%, n: ≦0.10%, v: 0-2.0%, cr: 0-3.0%, mo: 0-3.0%, ni: 0-1.5%, nb: 0-0.5%, ta: 0-0.5%, ti: 0-0.5%, zr: 0-0.5%, ca: 0-0.005%, mg: 0-0.005%, rem: 0-0.01%, b: 0-0.015%, the balance: fe and impurities, and satisfying [0.6<c−0.18v<1.44], wherein a metal micro-structure is consisting of an austenite single phase, a yield strength is 241 mpa or higher, and a uniform elongation is 40% or higher.. . ... Nippon Steel Corporation

12/07/17 / #20170349973

Titanium casting product for hot rolling and method for producing the same

Provided is a titanium casting product made of titanium alloy, the titanium casting product being produced by electron-beam remelting or plasma arc remelting, comprising: a melted and resolidified layer in a range of 1 mm or more in depth at a surface serving as a surface to be rolled, the melted and resolidified layer being obtained by adding one or more kinds of β stabilizer elements to the surface and melting and resolidifying the surface. An average value of β stabilizer element concentration in a range of within 1 mm in depth is higher than β stabilizer element concentration in a base material by, in mass %, equal to or more than 0.08 mass % and equal to or less than 1.50 mass %. ... Nippon Steel Corporation

12/07/17 / #20170349967

Hot-rolled steel sheet

A hot-rolled steel sheet includes a specific chemical composition, and includes a microstructure represented by, in vol %: retained austenite: 2% to 30%; ferrite: 20% to 85%; bainite: 10% to 60%; pearlite: 5% or less; and martensite: 10% or less. A proportion of grains having an intragranular misorientation of 5° to 14° in all grains is 5% to 50% 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

12/07/17 / #20170349219

T-shaped joint structure

The present invention has as its object the provision of a t-shaped joint structure sufficiently securing a mounting region for another member and securing rigidity of a joint part. A first member and a second member joined with the first member and extending in a direction vertical to the longitudinal direction of the first member are provided. ... Nippon Steel Corporation

12/07/17 / #20170348798

Power supply device, joining system, and electric processing method

There is provided a power supply device that supplies an output current to an electric processing device which performs electric processing on workpieces. The device includes: a first power supply; a magnetic energy recovery switch that receives a current supplied from the first power supply, and converts the received current into the output current; and a control unit that controls the magnetic energy recovery switch such that an electric current frequency of the output current includes a first electric current frequency and a second electric current frequency which are different from each other within a one-time electric processing time using the electric processing device.. ... Nippon Steel Corporation

12/07/17 / #20170348763

Method of manufacturing mechanical part and mechanical part

A method of manufacturing a mechanical part of the present invention includes a first process of forming, by performing a folding processing to an end portion of the material, a portion to be processed having a structure, in which a plurality of layers respectively having a thickness corresponding to a plate thickness of a material overlap each other, in the material such that a plate thickness direction of the layer is orthogonal to a plate thickness direction of the material; and a second process of changing, by performing a forging processing to the portion to be processed, a shape of the portion to be processed to a target shape while press-welding the layers of the portion to be processed to each other by plastic deformation.. . ... Nippon Steel Corporation

11/30/17 / #20170342593

Method for producing silicon carbide single crystal and silicon carbide single crystal substrate

The present invention provides a method for producing an sic single crystal, enabling obtaining an sic single crystal substrate in which a screw dislocation-reduced region is ensured in a wide range, and an sic single crystal substrate. The sic single crystal substrate is produced using a seed crystal having an off angle in the off orientation from a {0001} plane by a production method wherein in advance of a growth main step of performing crystal growth to form a facet {0001} plane in the crystal peripheral part on the crystal end face having grown thereon the bulk silicon carbide single crystal and obtain more than 50% of the thickness of the obtained sic single crystal, a growth sub-step of growing the crystal at a higher nitrogen concentration than in the growth main step and at a growth atmosphere pressure of 3.9 to 39.9 kpa and a seed crystal temperature of 2,100° c. ... Nippon Steel Corporation

11/30/17 / #20170342585

Sn plating steel sheet, chemical treatment steel sheet, and method of manufacturing the same

The chemical treatment steel sheet includes a steel sheet, a mat finished sn plating layer that is provided as an upper layer of the steel sheet and is formed of a β-sn, and a chemical treatment layer that is provided as an upper layer of the sn plating layer. The sn plating layer contains the β-sn of 0.10 g/m2 to 20.0 g/m2 in terms of an amount of metal sn. ... Nippon Steel Corporation

11/30/17 / #20170342569

Electrical steel sheet

An electrical steel sheet (1) includes a base material (2) of electrical steel, and an insulating film (3) formed on a surface of the base material (2). Three conditions (1.8≦3[fe]/[p]+Σnm[m]/[p]≦3.6, 0.6≦Σnm[m]/[p]≦2.4, and 0.6≦3[fe]/[p]≦2.4) are satisfied in a region of 50 area % or more of a cross section parallel to a thickness direction of the insulating film. ... Nippon Steel Corporation

11/30/17 / #20170342568

Electrical steel sheet

An electrical steel sheet (1) includes a base material (2) of electrical steel, and an insulating film (3) formed on a surface of the base material (2). The insulating film (3) contains a phosphate of one or more selected from the group consisting of al, zn, mg and ca. ... Nippon Steel Corporation

11/30/17 / #20170342530

Wire rod

A wire rod according to an aspect of the present invention has a predetermined chemical composition, a solute n is 0.0015% or less, a structure in an area from a surface of the wire rod to a depth of ¼ of a diameter of the wire rod in a cross section thereof includes 90.0 area % or more of pearlite, and 0 to 10.0 area % in total of bainite and ferrite, a total amount of martensite and cementite in the area from the surface of the wire rod to the depth of ¼ of the diameter of the wire rod is limited to 2.0 area % or less, and the calculated maximum size of tin-type inclusions in a surface layer area of the wire rod is 50 μm or less.. . ... Nippon Steel Corporation








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