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Jfe Steel Corporation patents


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

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High-strength cold-rolled steel sheet and manufacturing the same

A high-strength cold-rolled steel sheet excellent in terms of elongation (EL) and hole expansion ratio (A) having a low yield ratio (YR), as well as a method for manufacturing the steel sheet. The steel sheet has a chemical composition containing, by mass %, C: 0.15% to 0.25%, Si: 1.0% to... Jfe Steel Corporation

Hot rolled steel sheet and manufacturing same

A hot rolled steel sheet comprises: a predetermined chemical composition; a microstructure in which a total area ratio of a tempered bainite phase and a tempered martensite phase is 70% or more, a total area ratio of a coarse pearlite phase, a martensite phase, and a retained austenite phase is... Jfe Steel Corporation

Method for forming linear groove on cold rolled steel strip and manufacturing grain-oriented electrical steel sheet

A resist coating for etching use which enables high speed and high accuracy patterning is provided by applying, to a cold rolled steel strip, a positive resist ink which solubilizes upon exposure to light; then drying the positive resist ink to form a resist coating; then scanning a laser beam... Jfe Steel Corporation

Grain-oriented electrical steel sheet, manufacturing method therefor, and predicting transformer noise property

Provided is a grain-oriented electrical steel sheet having an excellent noise property in an actual transformer. Magnetostrictive properties of the grain-oriented electrical steel sheet are set such that the number of acceleration/deceleration points that are present in the magnetostriction velocity level dλ/dt in one period of magnetostrictive vibration is 4... Jfe Steel Corporation

Martensitic stainless steel

The disclosure is to provide a martensitic stainless steel excellent in strength, workability and corrosion resistance. The martensitic stainless steel comprises a chemical composition containing, in mass %: C: 0.020% or more and less than 0.10%, Si: 0.01% or more and 2.0% or less, Mn: 0.01% or more and 3.0%... Jfe Steel Corporation

Steel sheet for can lid and producing the same (as amended)

A steel sheet for can lids contains, in mass %, 0.020-0.060% of C, 0.01-0.05% of Si, 0.20-0.60% of Mn, 0.001-0.100% of P, 0.008-0.020% of S, 0.0130-0.0190% of N, and from 0.005% to {−4.20×N+0.110}% of Al, with Mnf being 0.30% to 0.58% (inclusive), where Mnf=Mn−1.7×S, and with the balance made up... Jfe Steel Corporation

Steel pipe, steel pipe structure, manufacturing steel pipe, and designing steel pipe

In a steel pipe having a waveform shape formed on an outer diameter thereof by a pipe expansion process, a value a/w is 0.038% or less, where a and w denote an amplitude and a wavelength of the waveform shape, respectively. A method of manufacturing a steel pipe having a... Jfe Steel Corporation

Method of monitoring manufacturing status of electric resistance welded pipe, device for monitoring manufacturing status of electric resistance welded pipe, and manufacturing electric resistance welded pipe

A method of monitoring a manufacturing status of an electric resistance welded pipe manufactured by shaping a steel strip into a pipe and butt welding both end parts of the steel strip in a width direction along a lengthwise direction includes: arranging an imaging unit in a gas shield nozzle... Jfe Steel Corporation

Thick steel plate for structural pipes or tubes, producing thick steel plate for structural pipes or tubes, and structural pipes and tubes

Disclosed is, as a high-strength steel plate of API X80 grade or higher with a thickness of 38 mm or more, a thick steel plate for structural pipes or tubes that exhibits high strength in the rolling direction and excellent Charpy properties at its mid-thickness part without addition of large... Jfe Steel Corporation

Continuous hot-dip metal coating method and continuous hot-dip metal coating line

A continuous hot-dip metal coating method that can reduce both non-coating caused by metal vapor generated in a snout and non-coating caused by an oxide film on a molten metal bath surface in the snout and stably and promptly change the oxidizability of the atmosphere in the snout is provided.... Jfe Steel Corporation

Steel for nitrocarburizing and nitrocarburized component, and methods of producing same

The steel for nitrocarburizing has a chemical composition that contains C: 0.01% or more and less than 0.20%, Si: 1.0% or less, Mn: 1.5% or more and 3.0% or less, P: 0.02% or less, S: 0.06% or less, Cr: 0.30% or more and 3.0% or less, Mo: 0.005% or more... Jfe Steel Corporation

Cold-rolled steel sheet and manufacturing method therefor

A cold-rolled steel sheet has: a predetermined chemical composition; and a microstructure in which tempered martensite and bainite are contained in a total area ratio of 95-100% with respect to a whole volume of the microstructure; a number of predetermined inclusion groups is at most 0.8/mm2, the inclusion groups being... Jfe Steel Corporation

Press-forming method, manufacturing component with the press-forming method and component manufactured with the press-forming method

A press-forming method for a component having a hat-shaped or U-shaped cross section and comprising a curved portion curved in a widthwise direction along with a longitudinal direction and straight side portions connecting to both ends of the curved portion from a sheet-shaped blank, wherein the blank is drawn to... Jfe Steel Corporation

Insulation-coated oriented magnetic steel sheet and manufacturing same

Provided are an insulation-coated oriented magnetic steel sheet having an insulating coat with excellent heat resistance; and a method for manufacturing the same. This insulation-coated oriented magnetic steel sheet has an oriented magnetic steel sheet, and an insulating coat arranged on the surface of the oriented magnetic steel sheet, the... Jfe Steel Corporation

Method of forming a closed cross-sectional structure

A method of forming a closed cross-sectional structure press-forming the plate-shaped workpiece into portions corresponding to bottom portion and left and right side wall portions; and providing bend-facilitating lines at the plurality of bend lines; bending the workpiece in a direction that the portions corresponding to the left and right... Jfe Steel Corporation

High-strength steel sheet and producing the same

A high-strength steel sheet having a high yield ratio and excellent stretch flangeability, and a method for producing the high-strength steel sheet. The high-strength steel sheet has a composition containing, by mass: C: 0.02% or more and less than 0.10%, Si: less than 0.10%, Mn: less than 1.0%, P: 0.10%... Jfe Steel Corporation

High-strength steel sheet and production method therefor

A high-strength steel sheet having a tensile strength of at least 780 MPa and excellent punchability comprises a ferrite phase, a martensite phase, and a bainite phase. The area ratio of the martensite phase is 20%-50%; the area ratio of crystal grains having an average crystal grain diameter of less... Jfe Steel Corporation

Insulating-coated oriented magnetic steel sheet and manufacturing same

Provided are an insulating-coated oriented magnetic steel sheet having an insulating coating of excellent heat resistance, and a method for manufacturing the same. This insulating-coated oriented magnetic steel sheet has an oriented magnetic steel sheet, and an insulating coating arranged on the surface of the oriented magnetic steel sheet. The... Jfe Steel Corporation

Threaded pipe joint

A threaded pipe joint, when acted upon by a tensile load, does not break on the female thread-side of a first thread section of a second thread series that extends from an intermediate shoulder. The threaded pipe joint reliably undergoes tensile rupture on the female thread-side of a first thread... Jfe Steel Corporation

Metal sheet for separators of polymer electrolyte fuel cells

A metal sheet for separators of polymer electrolyte fuel cells having both excellent corrosion resistance in the use environment of separators of polymer electrolyte fuel cells and excellent adhesion property between a substrate and a surface-coating layer even in the case where the surface-coating layer is made thinner is provided.... Jfe Steel Corporation

Method for producing water-atomized metal powder

A method for producing a water-atomized metal powder, comprising applying water to a molten metal stream, dividing the molten metal stream into a metal powder, and cooling the metal powder, wherein the metal powder is further subjected to secondary cooling with cooling capacity having a minimum heat flux point (MHF... Jfe Steel Corporation

High-strength steel, manufacturing high-strength steel, steel pipe and manufacturing steel pipe (as amended)

is 0.90% or more, wherein the symbols of chemical elements in equation (1) respectively denote the contents (mass %) of the corresponding chemical elements and wherein the symbol of a chemical element which is not included is assigned a value of 0, a microstructure having a bainite phase fraction of... Jfe Steel Corporation

Press forming method and press forming tool (as amended)

A press forming method according to the present invention includes: a first forming step of forming the press formed part by using the first press forming tool having a line length in the cross-sectional direction of the joining portion contacting with a flange portion subjected to stretch flange deformation or... Jfe Steel Corporation

Resin-coated metal sheet for container

A resin-coated metal sheet for containers that has excellent content releasability is provided. The resin-coated metal sheet includes a resin layer (A) and a resin layer (B). The resin layer (A) has a multilayer structure and is disposed on a side which, after the metal sheet is formed into a... Jfe Steel Corporation

High-strength steel, manufacturing high-strength steel, steel pipe, and manufacturing steel pipe

A high-strength steel having a specified chemical composition, wherein parameter Peff is 0.050% or more, the relationship (TS0−TS)/TS0≦0.050 is satisfied, wherein TS is defined as tensile strength determined at a temperature of 350° C. after aging has been performed under the condition of a Larson-Miller Parameter (LMP) of 15700, and... Jfe Steel Corporation

Non-oriented electrical steel sheet, production method therefor, and motor core

In the production of a non-oriented electrical stress sheet by hot rolling a slab having a chemical composition comprising, by mass %, C: not more than 0.005, Si: 1.5-6.0, Mn: 0.05-2.0 and P: 0.03-0.15, subjecting to a hot band annealing, if necessary, cold rolling, finish annealing, and forming an insulation... Jfe Steel Corporation

Grain-oriented electrical steel sheet and manufacturing same

Provided are a grain-oriented electrical steel sheet with low iron loss even when including at least one grain boundary segregation element among Sb, Sn, Mo, Cu, and P, and a method for manufacturing the same. In our method, Pr is controlled to satisfy Pr≦−0.075T+18, where T>10, 5<Pr, T (hr) is... Jfe Steel Corporation

Steel plate for structural pipes or tubes, producing steel plate for structural pipes or tubes, and structural pipes and tubes

Disclosed is, as a high-strength steel plate of API X100 grade or higher, a steel plate for structural pipes or tubes that exhibits high strength in a rolling direction and that has only a small difference between strength in a rolling direction and strength in a direction perpendicular to the... Jfe Steel Corporation

Steel plate for structural pipes or tubes, producing steel plate for structural pipes or tubes, and structural pipes and tubes

Disclosed is, as a high-strength steel plate of API X80 grade or higher with a thickness of 38 mm or more, a steel plate for structural pipes or tubes that exhibits excellent resistance to PWHT and excellent toughness at the heat-affected zone, particularly at the butting faces joined by welding,... Jfe Steel Corporation

High-strength steel sheet and production method therefor

A high-strength steel sheet having excellent punchability and a tensile strength of at least 780 MPa has a steel structure containing, by area ratio, 70%-90% ferrite phase and 10%-30% martensite phase. The non-recrystallized ferrite content in the ferrite phase is 30%-50% and the ratio of crystal grains having an aspect... Jfe Steel Corporation

High-strength, high-toughness steel plate and producing the same

A high-strength, high-toughness steel plate having excellent surface properties and a high absorbed energy includes, by mass %, C: 0.03% to 0.08%, Si: 0.01% to 0.50%, Mn: 1.5% to 2.5%, P: 0.001% to 0.010%, S: 0.0030% or less, Al: 0.01% to 0.08%, Nb: 0.010% to 0.080%, Ti: 0.005% to 0.025%,... Jfe Steel Corporation

Thin high-strength cold-rolled steel sheet and producing the same

A steel having a composition containing C: more than 0.20% and 0.45% or less, Si: 0.50% to 2.50%, Mn: 2.00% or more and less than 3.50%, and one or two selected from Ti: 0.005% to 0.100% and Nb: 0.005% to 0.100% is hot-rolled and cold-rolled. The steel sheet is heated... Jfe Steel Corporation

High-strength cold-rolled steel sheet and manufacturing the same

A high-strength, cold-rolled steel sheet having a tensile strength of 980 MPa or more, the steel sheet having a chemical composition containing, by mass %, C: 0.070% to 0.100%, Si: 0.50% to 0.70%, Mn: 2.40% to 2.80%, P: 0.025% or less, S: 0.0020% or less, Al: 0.020% to 0.060%, N:... Jfe Steel Corporation

03/01/18 / #20180057956

Method for forming linear groove on steel strip and manufacturing grain-oriented electrical steel sheet

A resist coating for etching use which enables high speed and high accuracy patterning is provided by applying, to a steel strip, a negative resist ink which solidifies upon exposure to light; drying the ink to form a resist coating; then irradiating the steel strip with light while moving a... Jfe Steel Corporation

02/22/18 / #20180051355

High-strength steel, manufacturing high-strength steel, steel pipe, and manufacturing steel pipe

is 0.75% or more, wherein the symbols of chemical elements in equation (1) respectively denote the contents (mass %) of the corresponding chemical elements and wherein the symbol of a chemical element which is not included is assigned a value of 0, a microstructure having a bainite phase fraction of... Jfe Steel Corporation

02/22/18 / #20180051356

Method of producing galvannealed steel sheet

A method of producing a galvannealed steel sheet whereby favorable coating appearance can be obtained with high coating adhesion even in the case of galvannealing a steel strip whose Si content is 0.2 mass % or more, and a decrease in tensile strength can be prevented by lowering the alloying... Jfe Steel Corporation

02/22/18 / #20180051362

Steel sheet for crown cap, manufacturing steel sheet for crown cap, and crown cap

Provided are a steel sheet, having sufficient strength and formability regardless of reduction of thickness, for crown caps; a method for manufacturing the same; and a crown cap. The steel sheet for crown caps has a composition containing C: 0.0010% to less than 0.0050%, Si: 0.10% or less, Mn: 0.05%... Jfe Steel Corporation

02/22/18 / #20180051363

Thick steel plate for structural pipes or tubes, producing thick steel plate for structural pipes or tubes, and structural pipes and tubes

Disclosed is, as a high-strength steel plate of API X80 grade or higher with a thickness of 38 mm or more, a thick steel plate for structural pipes or tubes that exhibits high strength in the rolling direction, excellent Charpy properties at its mid-thickness part, and high material homogeneity without... Jfe Steel Corporation

02/22/18 / #20180051366

Hot-dip al-zn-mg-si coated steel sheet and producing same

where MMg represents the Mg content (mass %) and MSi represents the Si content (mass %).... Jfe Steel Corporation

02/15/18 / #20180043459

Resistance spot welding method and manufacturing resistance spot welded joint

A resistance spot welding method of squeezing a predetermined sheet combination by a pair of electrodes and passing a current while applying an electrode force to join the sheet combination includes: performing test welding; and performing actual welding after the test welding, wherein in each of the test welding and... Jfe Steel Corporation

02/15/18 / #20180043461

Resistance spot welding device

A resistance spot welding device for welding at least two overlapping steel sheets held between a pair of welding electrodes is provided. The resistance spot welding device includes the pair of electrodes, an electrode force gauge that measures an electrode force, and a controller that controls an electric current supply... Jfe Steel Corporation

02/15/18 / #20180043466

Friction stir welding structural steel

A friction stir welding apparatus that includes a rotary tool and a heating device. The heating device is placed in front of the rotary tool to heat steel sheets that are used as a workpiece. The rotary tool is moved in the welding direction so that steel sheet is softened... Jfe Steel Corporation

02/15/18 / #20180044745

Method for operating blast furnace

To provide a method for operating a blast furnace with which the combustion efficiency of a solid fuel, such as pulverized coal, is improved, thereby making it possible to improve productivity and reduce CO2 emissions. Pulverized coal and LNG are blown from an upstream lance configured by a double tube,... Jfe Steel Corporation

02/15/18 / #20180044748

Steel material for composite pressure vessel liner, steel pipe or tube for composite pressure vessel liner, and manufacturing steel pipe or tube for composite pressure vessel liner

Steel material for composite pressure vessel liners that, when used as raw material for manufacturing a composite pressure vessel liner, yields a liner having sufficient strength and a high fatigue limit and enables the manufacture of an inexpensive composite pressure vessel is provided. Steel material for composite pressure vessel liners... Jfe Steel Corporation

02/15/18 / #20180044751

High-strength cold-rolled steel sheet and manufacturing the same (as amended)

A high-strength cold-rolled steel sheet having a tensile strength (TS) of 1150 MPa or more and excellent elongation and delayed fracturing resistance, as well as a method for manufacturing the steel sheet. The steel sheet has a chemical composition containing, by mass %, C: 0.16% to 0.30%, Si: 1.20% to... Jfe Steel Corporation

02/15/18 / #20180044753

High-strength steel sheet and producing the same

A high-strength steel sheet having a high yield ratio and a reduced difference in strength between the center and edges of the steel sheet in the width direction. The high-strength steel sheet includes a composition containing, by mass, C: 0.02% or more and less than 0.10%, Si: less than 0.10%,... Jfe Steel Corporation

02/08/18 / #20180036830

Electric resistance welded steel pipe having identifiable seam portion and manufacturing the same

An electric resistance welded steel pipe having an identifiable seam portion and a method for manufacturing the same. The electric resistance welded steel pipe includes a steel pipe portion with a seam portion, which is formed by electric resistance welding, and a coating portion of zinc phosphate. The coating portion... Jfe Steel Corporation

02/08/18 / #20180037965

Grain-oriented electrical steel sheet and production method therefor

Disclosed are a grain-oriented electrical steel sheet having strain regions extending in a direction transverse to a rolling direction at periodic interval s (mm) in the rolling direction. Each strain region has a closure domain region whose width in the rolling direction varies periodically on a steel sheet surface. Each... Jfe Steel Corporation

02/08/18 / #20180037966

Grain-oriented electrical steel sheet and producing same

A grain-oriented electrical steel sheet having a composition containing, in mass %, C: 0.005% or less, Si: 2.0% to 4.5%, and Mn: 0.5% or less, and also containing Sb and P in respective ranges satisfying 0.01%≦[% Sb]≦0.20% and 0.02%≦[% P]≦2.0×[% Sb], with a balance being Fe and incidental impurities, wherein... Jfe Steel Corporation

02/08/18 / #20180037969

High-strength cold-rolled steel sheet and producing the same

A steel sheet contains C: 0.15% to 0.22%, Si: 1.0% to 2.0%, Mn: 1.7% to 2.5%, P: 0.05% or less, S: 0.02% or less, Al: 0.01% to 0.05%, N: 0.005% or less, O: 0.01% or less, and the balance being iron and unavoidable impurities while satisfying [Si]/[Mn]≧0.5 ([Si] and [Mn]... Jfe Steel Corporation

02/08/18 / #20180038402

Resistance spot welding method and weld joint

Provided is a method for resistance spot-welding at least two overlapping steel sheets. When an electrode force F after an electric current supply is started changes from an initial electrode force Fi to an electrode force Fh(1) while a lapse from the start of the electric current supply is between... Jfe Steel Corporation

02/01/18 / #20180029334

Laminated metal sheet for container

A lower layer in contact with a metal sheet of a laminated resin layer contains 90 mol % or more of terephthalic acid in the polycarboxylic acid component and 30 to 50 mol % of ethylene glycol, 50 to 70 mol % of 1,4-butanediol, and 10 mol % or less... Jfe Steel Corporation

02/01/18 / #20180030557

High-strength electric resistance welded steel pipe and producing the same

Provided is a high-strength electric resistance welded steel pipe having excellent bendability and which includes a composition containing, on a mass % basis, C: 0.04% to 0.15%, Si: 0.10% to 0.50%, Mn: 1.0% to 2.2%, P: 0.050% or less, S: 0.005% or less, Cr: 0.2% to 1.0%, Ti: 0.005% to... Jfe Steel Corporation

02/01/18 / #20180030558

Method for producing non-oriented electrical steel sheets

In the production of a non-oriented electrical stress sheet by hot rolling a steel slab containing, by mass %, C: not more than 0.005%, Si: not more than 8.0%, Mn: 0.03-3.0%, P: not more than 0.2%, S: not more than 0.005%, Al: not more than 3.0%, N: not more than... Jfe Steel Corporation

02/01/18 / #20180030559

Grain-oriented electrical steel sheet and manufacturing same

In a grain-oriented electrical steel sheet including: a steel substrate; a ceramic base film; and an insulating coating, critical damage shear stress τ between the base film and the steel substrate is 50 MPa or more. Thus, a grain-oriented electrical steel sheet having excellent insulation property, stacking factor, and magnetic... Jfe Steel Corporation

02/01/18 / #20180030563

Case hardening steel

A case hardening steel having excellent fatigue resistance is provided at relatively low production cost. A case hardening steel has a chemical composition containing C: 0.10% to 0.30%, Si: 0.10% to 1.20%, Mn: 0.30% to 1.50%, S: 0.010% to 0.030%, Cr: 0.10% to 1.00%, B: 0.0005% to 0.0050%, Sb: 0.005%... Jfe Steel Corporation

02/01/18 / #20180030564

High-strength galvanized steel sheet and producing the same

A high-strength galvanized steel sheet and method for producing the same. The high-strength galvanized steel sheet including a specified chemical composition and a microstructure comprising, in terms of area fraction, a tempered martensite phase: 30% or more and 73% or less, a ferrite phase: 25% or more and 68% or... Jfe Steel Corporation

02/01/18 / #20180030565

High-strength galvanized steel sheet and manufacturing the same

A high-strength galvanized steel sheet having a chemical composition containing, by mass %, C: 0.07% to 0.25%, Si: 0.01% to 3.00%, Mn: 1.5% to 4.0%, P: 0.100% or less, S: 0.02% or less, Al: 0.01% to 1.50%, N: 0.001% to 0.008%, Ti: 0.003% to 0.200%, B: 0.0003% to 0.0050%, and... Jfe Steel Corporation

02/01/18 / #20180030568

Hot-pressed member and manufacturing method therefor

A hot-pressed member is formed using a tailored blank material obtained by butt joining respective ends of two or more coated steel sheets. The hot-pressed member has two or more sites formed by the respective coated steel sheets and at least one joining portion between the sites. Depending on a... Jfe Steel Corporation

02/01/18 / #20180030612

Method for continuous electrolytic etching of grain oriented electrical steel strip and continuous electrolytic etching of grain oriented electrical steel strip

Method for continuous electrolytic etching of a grain oriented electrical steel strip includes: forming an etch mask on a surface of a grain oriented electrical steel strip cold-rolled to final thickness with a linear exposed portion exposed from the etch mask; centering the grain oriented electrical steel strip with a... Jfe Steel Corporation

02/01/18 / #20180031501

Evaluating coal and producing coke (as amended)

A method for accurately measuring the thermoplasticity of a coal whose thermoplasticity has been difficult to evaluate and determining whether the coal that is to be measured does not significantly reduce the coke strength when used for a coal blend is disclosed. Also disclosed is a method for evaluating a... Jfe Steel Corporation

01/25/18 / #20180021831

Press forming method and tool of press forming

A press forming method for forming a press-formed product having no flange portion from a blank by performing a crash forming process while using a die and a punch, the press-formed product including at least a top portion and a side wall portion continued from the top portion via a... Jfe Steel Corporation

01/25/18 / #20180023152

Method for operating blast furnace

To provide a method for operating a blast furnace with which the combustion efficiency of a solid fuel, such as pulverized coal, is improved, thereby making it possible to improve productivity and reduce CO2 emissions. Pulverized coal and oxygen are blown from an upstream lance 4 configured by a double... Jfe Steel Corporation

Patent Packs
01/25/18 / #20180023154

High-strength galvanized steel sheet and manufacturing the same (as amended)

A high-strength galvanized steel sheet having a chemical composition containing, by mass %, C: 0.07% to 0.25%, Si: 0.01% to 3.00%, Mn: 1.5% to 4.0%, P: 0.100% or less, S: 0.02% or less, Al: 0.01% to 1.50%, N: 0.001% to 0.008%, Ti: 0.003% to 0.200%, B: 0.0003% to 0.0050%, and... Jfe Steel Corporation

01/25/18 / #20180023158

High-strength heavy-walled stainless steel seamless tube or pipe and manufacturing the same

A high-strength heavy-walled stainless steel seamless tube or pipe exhibiting excellent low-temperature toughness is characterized by having a chemical composition containing Cr: 15.5% to 18.0% and a steel microstructure containing a ferritic phase and a martensitic phase, wherein the maximum value of the areas of the ferrite grains in the... Jfe Steel Corporation

01/25/18 / #20180023160

High-strength steel sheet and production method therefor

A steel sheet has a microstructure that contains ferrite in an area ratio of 20% or more, martensite in an area ratio of 5% or more, and tempered martensite in an area ratio of 5% or more. The ferrite has a mean grain size of 20.0 μm or less. An... Jfe Steel Corporation

01/25/18 / #20180023161

High-strength steel sheet and production method therefor

A steel sheet has a microstructure that contains ferrite in an area ratio of 20% or more, martensite in an area ratio of 5% or more, and tempered martensite in an area ratio of 5% or more. The ferrite has a mean grain size of 20.0 μm or less. An... Jfe Steel Corporation

01/25/18 / #20180023163

High-strength welded steel pipe for airbag inflator and manufacturing the same (as amended)

Disclosed is a high-strength welded steel pipe for airbag inflators that has high toughness and workability. A base material portion of the steel pipe has a composition containing, in mass %, C: 0.02 to 0.08%, Si: 0.001 to 1.0%, Mn: 0.1 to 2.0%, P: 0.1% or less, Al: 0.01 to... Jfe Steel Corporation

01/25/18 / #20180023166

Ferrocoke manufacturing method

In a ferrocoke manufacturing method by shaping and carbonizing a mixture of coal and iron ore, a hardly softening coal having a button index (CSN) of not more than 2.0 is used as the coal. The coal can be a blend of hardly softening coal and easily softening coal, and... Jfe Steel Corporation

01/25/18 / #20180026276

Stainless steel sheet for separator of polymer electrolyte fuel cell

A stainless steel sheet for a separator of a polymer electrolyte fuel cell includes a substrate made of stainless steel and a Sn alloy layer with which a surface of the substrate is coated. The Sn alloy layer includes 10 or more microcracks per cm2.... Jfe Steel Corporation

01/18/18 / #20180016656

High-strength steel sheet and production method therefor

A steel sheet has a microstructure that contains ferrite in an area ratio of 20% or more, martensite in an area ratio of 5% or more, and tempered martensite in an area ratio of 5% or more. The ferrite has a mean grain size of 20.0 μm or less. An... Jfe Steel Corporation

01/18/18 / #20180016657

High strength steel sheet and manufacturing method therefor

A high strength steel sheet having high strength such as a tensile strength of 780 MPa or more and having excellent blanking workability and stretch flangeability and a manufacturing method therefor are provided. A high strength steel sheet comprises: a chemical composition containing, in mass %, C: 0.05% to 0.30%,... Jfe Steel Corporation

01/18/18 / #20180017539

Coal-to-coal adhesiveness evaluation method

In order to evaluate the compatibility of coals used in coke production and to produce cokes with desired strength by blending coals in consideration of the compatibility, the invention provides a technique which evaluates the adhesion strength obtained when two kinds of coals are carbonized based. on properties of the... Jfe Steel Corporation

01/18/18 / #20180017868

Manufacturing grain-oriented electrical steel sheet

Provided is a manufacturing method for a grain-oriented electrical steel sheet with which it is possible to achieve both good iron loss and high productivity. In groove formation for magnetic domain refinement, a resist containing a photosensitive resin is applied, photoexposed, and developed to form an exposed steel substrate portion... Jfe Steel Corporation

01/11/18 / #20180009050

Welding structure of press formed part, structural part for automotive body including the welding structure, and manufacturing welding part (as amended)

A welding structure of a press-formed part made by combining and joining two parts formed by press-forming and each having an opening portion on at least one side of a cross-section, while the opening portions face each other, and includes a step portion that is provided by forming a bent... Jfe Steel Corporation

01/04/18 / #20180001369

Punching method, punching device, and manufacturing laminated iron core (as amended)

A punching method includes: punching out a plurality of electrical steel sheets in a stacked state by a mold, wherein sheet thicknesses of the electrical steel sheets are set to be 0.35 mm or less, a Vickers hardness (test force 1 kg) of the sheets is set to be 150... Jfe Steel Corporation

01/04/18 / #20180001377

Continuous casting steel

Provided is a continuous casting method of steel that prevents a solidification completion position from being changed even when a drawing speed V of a cast slab is changed. The method includes drawing a cast slab by setting a drawing speed V0 while spraying cooling water to the cast slab... Jfe Steel Corporation

01/04/18 / #20180002773

Grain-oriented electrical steel sheet and manufacturing same

A grain-oriented electrical steel sheet that includes a base coating with a high TiN ratio advantageous for the application of tension to the steel sheet and has excellent magnetic property is provided. The grain-oriented electrical steel sheet includes: a base coating having a peak value PTiN of TiN in the... Jfe Steel Corporation

Patent Packs
01/04/18 / #20180002777

High-strength steel sheet and manufacturing the same

Provided are a high-strength steel sheet and a method for manufacturing the steel sheet. The high-strength steel sheet has a specified chemical composition with the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 30% or more of a ferrite phase, 40% to 65% of... Jfe Steel Corporation

01/04/18 / #20180002778

High-strength steel sheet and manufacturing the same

Provided are a high-strength steel sheet and a method for manufacturing the steel sheet. The high-strength steel sheet has a specified chemical composition with the balance being Fe and inevitable impurities, a microstructure including, in terms of area ratio, 25% or less of a ferrite phase, 75% or more of... Jfe Steel Corporation

01/04/18 / #20180002789

Non-oriented electrical steel sheet and producing the same

When a non-oriented electrical steel sheet is produced by hot rolling a slab containing, by mass %, C: not more than 0.0050%, Si: 1.5-5.0%, Mn: 0.20-3.0%, sol. Al: not more than 0.0050%, P: not more than 0.2%, S: not more than 0.0050% and N: not more than 0.0040% to form... Jfe Steel Corporation

01/04/18 / #20180002800

High-strength galvanized steel sheet and producing the same

A high-strength galvanized steel sheet that includes a chemical composition containing, by mass %, C: 0.15% or more and 0.25% or less, Si: 0.50% or more and 2.5% or less, Mn: 2.3% or more and 4.0% or less, P: 0.100% or less, S: 0.02% or less, Al: 0.01% or more... Jfe Steel Corporation

12/28/17 / #20170368590

Punch processing laminated iron core and manufacturing laminated iron core

A punch processing method for a laminated iron core includes sequentially feeding the steel sheets to a mold; and performing a plurality of processes in the mold, the plurality of processes includes fixing the steel sheets being stacked to each other at a first fixing part that is positioned outside... Jfe Steel Corporation

12/28/17 / #20170369958

Thick-walled high-toughness high-strength steel plate and manufacturing the same

A thick-walled, high-toughness, high-strength steel plate manufactured from steel having a particular composition and casted under conditions where the cooling rate of a surface during solidification is 1° C./s or less. The surface of the steel plate has a toughness (vE-40) of 70 J or more, and the steel plate... Jfe Steel Corporation

12/28/17 / #20170369962

High strength thick-walled elecric-resistance-welded steel pipe for deep-well conductor casing, manufacturing the same, and high strength thick-walled conductor casing for deep wells

A high-strength high-toughness electric-resistance-welded steel pipe having high resistance to post-weld heat treatment is provided. The steel pipe having a composition including C: 0.01% to 0.12%, Si: 0.05% to 0.50%, Mn: 1.0% to 2.2%, P: 0.03% or less, S: 0.005% or less, Al: 0.001% to 0.10%, N: 0.006% or less,... Jfe Steel Corporation

12/28/17 / #20170369963

Seamless stainless steel pipe for oil country tubular goods and manufacturing the same

A method of manufacturing a seamless stainless steel pipe for Oil Country Tubular Goods by heating a billet having a specified chemical composition including forming the billet into a seamless steel pipe by applying hot working to the billet, cooling the seamless steel pipe to a room temperature at a... Jfe Steel Corporation

12/21/17 / #20170361372

Continuous casting mold and continuous casting of steel (as amended)

0.7≦αc/αm≦3.5   (2)... Jfe Steel Corporation

12/21/17 / #20170362678

High strength thick-walled electric-resistance-welded steel pipe for deep-well conductor casing, manufacturing the same, and high-strength thick-walled conductor casing for deep wells

A high-strength high-toughness electric-resistance-welded steel pipe having high resistance to post-weld heat treatment is provided. The steel pipe having a composition including C: 0.01% to 0.12%, Si: 0.05% to 0.50%, Mn: 1.0% to 2.2%, P: 0.03% or less, S: 0.005% or less, Al: 0.001% to 0.10%, N: 0.006% or less,... Jfe Steel Corporation

12/14/17 / #20170355038

Method for producing circumferential weld joint for low-carbon martensitic stainless steel pipes (as amended)

Provided is a method for producing a circumferential weld joint. With this method, when low-carbon martensitic stainless steel pipes used for pipelines for transportation of petroleum and natural gas are subjected to circumferential welding, the circumferential welding can be performed efficiently using a low-cost welding material having a composition similar... Jfe Steel Corporation

12/14/17 / #20170356071

Electric resistance welded steel pipe and manufacturing method therefor

A resistance welded steel pipe is provided. A hot-rolled steel sheet having a composition containing, in mass %, C: 0.025 to 0.168%, Si: 0.10 to 0.30%, Mn: 0.60 to 1.90%, and one or at least two selected from Ca, Nb, V, and Ti such that Pcm is 0.20 or less... Jfe Steel Corporation

12/07/17 / #20170348790

Steel sheet assembly, manufacturing steel sheet assembly, and spot welding process

A steel sheet assembly includes a plurality of lapped steel sheets which have a tensile strength of 1,470 MPa or less and a thickness of 0.3 mm to 5.0 mm, the steel sheet assembly being formed by applying, in advance, an adhesive and a carbon-supplying agent to a surface of... Jfe Steel Corporation

12/07/17 / #20170349963

High-strength seamless steel pipe for oil country tubular goods and producing the same (as amendmed)

A high-strength seamless steel pipe for oil country tubular goods comprising, by mass %, C: 0.20% to 0.50%, Si: 0.05% to 0.40%, Mn: 0.3% to 0.9%, P: 0.015% or less, S: 0.005% or less, Al: 0.005% to 0.1%, N: 0.006% or less, Mo: more than 1.0% to 3.0% or less,... Jfe Steel Corporation

12/07/17 / #20170349964

High-strength seamless steel pipe for oil country tubular goods and producing the same (as amended)

A high-strength seamless steel pipe for oil country tubular goods comprising, by mass %, C: 0.20% to 0.50%, Si: 0.05% to 0.40%, Mn: more than 0.6% to 1.5% or less, P: 0.015% or less, S: 0.005% or less, Al: 0.005% to 0.1%, N: 0.006% or less, Mo: more than 1.0%... Jfe Steel Corporation

12/07/17 / #20170349965

Method of quenching steel pipe, quenching steel pipe, manufacturing steel pipe and facility for manufacturing steel pipe

A method quenches a steel pipe and an apparatus quenches a steel pipe by which a steel pipe having excellent and uniform quality can be acquired by applying uniform rapid cooling to the steel pipe in a longitudinal direction as well as in a circumferential direction of the steel pipe... Jfe Steel Corporation

12/07/17 / #20170349981

Iron-based alloy powder for powder metallurgy, and sinter-forged member

An iron-based alloy powder for powder metallurgy contains 2.0 mass % to 5.0 mass % of Cu, the balance being Fe and incidental impurities. From 1/10 to 8/10 of the Cu is diffusion bonded in powder-form to the surfaces of iron powder that serves as a raw material for the... Jfe Steel Corporation

12/07/17 / #20170349984

Stainless steel and production method therefor

Stainless steel that has excellent formability and ridging resistance and can be produced with high productivity is provided. The stainless steel comprises: a chemical composition containing, in mass %, C: 0.005% to 0.050%, Si: 0.01% to 1.00%, Mn: 0.01% to 1.0%, P: 0.040% or less, S: 0.010% or less, Cr:... Jfe Steel Corporation

12/07/17 / #20170349995

Ferritic stainless steel and process for producing same

Provided is a ferritic stainless steel having a chemical composition containing, in mass %: 0.003% to 0.025% of C; 0.05% to 1.00% of Si; 0.05% to 1.00% of Mn; 0.04% or less of P; 0.01% or less of S; 16.0% to 23.0% of Cr; 0.20% to 0.80% of Cu; 0.05%... Jfe Steel Corporation

11/30/17 / #20170342519

Material for laminated iron core, and manufacturing laminated iron core

A material for laminated iron cores is used as plural steel sheets to be overlapped with one another and punched when a laminated iron core is manufactured. A surface roughness of the steel sheets forming the material for laminated iron cores is at an arithmetic mean roughness Ra of 0.40... Jfe Steel Corporation

11/23/17 / #20170333982

Method of manufacturing steel strip for coiled tubing

A method of manufacturing a steel strip for coiled tubing includes melting molten steel having a composition including, in terms of percent by mass, C: 0.10% or more and 0.16% or less, Si: 0.1% or more and 0.5% or less, Mn: 0.5% or more and 1.5% or less, P: 0.02%... Jfe Steel Corporation

11/23/17 / #20170333983

Method of manufacturing round steel billet

A method of manufacturing a round steel billet by continuous casting includes a local cooling step where inhomogeneous forced cooling is applied to a cast product during the continuous casting, and a rolling reduction step where rolling reduction is applied to the cast product in the opposite directions of the... Jfe Steel Corporation

11/23/17 / #20170335422

Apparatus line for manufacturing seamless steel pipe and tube and manufacturing duplex seamless stainless steel pipe

An apparatus line for manufacturing seamless steel pipes and tubes includes: a heating apparatus for heating a steel raw material; a piercing apparatus for piercing the heated steel raw material thus forming a hollow material; and a rolling apparatus for applying working to the hollow material to form a seamless... Jfe Steel Corporation

11/23/17 / #20170335438

Steel sheet for crown cap, manufacturing method therefor, and crown cap

A steel sheet for a crown cap has sufficient strength and formability even when the thickness thereof is reduced for use, and has a composition containing, in percent by mass, C: 0.010% to 0.025%, Si: 0.10% or less, Mn: 0.05% to 0.50%, P: 0.050% or less, S: 0.005% to 0.050%,... Jfe Steel Corporation

11/23/17 / #20170336336

Quantitative analysis device for trace carbon and quantitative analysis trace carbon

The present invention makes it possible to analyze trace carbon in a sample without the effects of contamination. In an electron probe microanalyzer, a liquid nitrogen trap and a plasma or oxygen radical generator are jointly used as a means for suppressing contamination, and two or more carbon detection units... Jfe Steel Corporation

11/23/17 / #20170337304

Method of evaluating hot stamped part and manufacturing hot stamped part

A method of evaluating a hot stamped part manufactured by hot stamping a coated steel sheet having a Zn—Ni coating layer on a surface of a base steel sheet includes an analysis model setting step, a forming condition setting step, a forming analysis step, and an evaluation step which are... Jfe Steel Corporation








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