Real Time Touch



new TOP 200 Companies filing patents this week

new Companies with the Most Patent Filings (2010+)




Real Time Touch

Jfe Steel Corporation patents (2018 archive)


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.

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


Lap fillet arc-welded joint

A lap fillet arc-welded joint produced by overlapping two metal sheets and welding an end portion of one sheet of the two metal sheets to a surface of the other sheet along the end portion of the one sheet includes a protruding curved potion being bead-shaped and protruding from the surface of the other sheet; and a weld toe positioned on a top portion of the protruding curved portion.. . ... Jfe Steel Corporation

Ferritic stainless steel and method for manufacturing the same

A ferritic stainless steel having sufficient corrosion resistance and excellent formability and ridging resistance. The ferritic stainless steel having a chemical composition comprising, by mass %, c: 0.005% or more and 0.035% or less, si: 0.25% or more and less than 0.40%, mn: 0.05% or more and 0.35% or less, p: 0.040% or less, s: 0.01% or less, cr: 15.5% or more and 18.0% or less, al: 0.001% or more and 0.10% or less, n: 0.01% or more and 0.06% or less, and the balance being fe and inevitable impurities. ... Jfe Steel Corporation

Insulative coating processing liquid and method for manufacturing metal having insulative coating

Provided is an insulative coating processing liquid with which an insulative coating can be obtained. The insulative coating processing liquid contains: at least one phosphate selected from the group consisting of mg, ca, ba, sr, zn, al, and mn; and two or more types of colloidal silicas having different mean particle diameters, wherein the total contained amount of the colloidal silicas in terms of the sio2 solid content is 50-120 parts by mass with respect to 100 parts by mass of the solid content of the phosphate, a mean particle diameter ratio expressed as ri+1/ri is not lower than 1.5 when the mean particle diameters of the colloidal silicas are represented in an ascending order, and a mass ratio expressed as wi+1/(wi+1+wi) is 0.30-0.90 when the masses of the colloidal silicas in terms of the sio2 solid content are represented in an ascending order of the respective mean particle diameters.. ... Jfe Steel Corporation

Electrical steel sheet with insulating coating

The disclosure provides an electrical steel sheet with an insulating coating excellent in both punchability and powdering resistance, without any chromium compound being contained in the insulating coating. The electrical steel sheet with an insulating coating includes an electrical steel sheet and an insulating coating formed on the electrical steel sheet. ... Jfe Steel Corporation

Rail cooling device

A rail cooling device configured to forcibly cool a rail by jetting a coolant includes a porous plate nozzle including a plurality of nozzle holes configured to jet the coolant to an underside of the base of the rail to cool the underside of the base of the rail. Ends in a width direction of the porous plate nozzle correspond to ends of the underside of the base of the rail. ... Jfe Steel Corporation

Method of producing hot-dip galvanized steel sheet

A method includes: annealing a steel strip by conveying the steel strip through a heating zone, a soaking zone, and a cooling zone in this order inside an annealing furnace; and applying a hot-dip galvanized coating onto the steel strip discharged from the cooling zone. Reducing gas or non-oxidizing gas supplied into the soaking zone includes humidified gas and dry gas. ... Jfe Steel Corporation

High strength steel sheet and method for manufacturing the same

A high-strength steel sheet having a composition containing c: 0.09% to 0.17%, si: 0.6% to 1.7%, mn: 3.5% or less, p: 0.03% or less, s: 0.005% or less, al: 0.08% or less, n: 0.006% or less, ti: 0.05% or less, and b: 0.0002% to 0.0030% on a mass basis, the remainder being fe and inevitable impurities. The steel sheet also has a microstructure containing less than 20% (including 0%) of a ferrite phase, 75% or more (including 100%) of a tempered martensite phase, 10% or less (including 0%) of an untempered martensite phase, and less than 5% (including 0%) of a retained austenite phase in terms of area fraction. ... Jfe Steel Corporation

High-strength hot-rolled steel sheet and method for manufacturing the same

A high-strength hot-rolled steel sheet that has excellent punching workability and hole expandability, and a method for manufacturing the same. The hot-rolled steel sheet has a tensile strength of 980 mpa or more. ... Jfe Steel Corporation

Raw material powder for soft magnetic powder, and soft magnetic powder for dust core

Soft magnetic powder for dust cores that yields dust cores having low eddy current loss is provided. Raw material powder for soft magnetic powder comprises fe: 60 mass % or more, a γ-phase stabilizing element, and an electric resistance-increasing element: 1.0 mass % or more.. ... Jfe Steel Corporation

Board product loading position notification system, board product loading position notification method, and board product loading position notification program

. . A board product loading position notification system has: an information network; a stowage planned position creation unit which is connected to the information network and a database and which creates a first stowage planned position for each of a plurality of board products in a hold; a web server storing the first stowage planned position created by the stowage planned position creation unit as a loading position in the database; and an information processing terminal at a shipping destination connected to the information network so that the loading position stored in the database is able to be accessed through the web server. When the plurality of board products is shipped by vessel, the shipping destination is notified of each of the loading positions for the plurality of board products in the hold of the vessel.. ... Jfe Steel Corporation

Gas-phase hydrogen permeation test device and method of protecting gas-phase hydrogen permeation test device

Provided is a gas-phase hydrogen permeation test device capable of safely measuring hydrogen permeation behavior in a material under a high-pressure hydrogen atmosphere. The gas-phase hydrogen permeation test device includes a high-pressure hydrogen feeder, an analyzer, a primary-side pipe, a secondary-side pipe, a secondary-side pressure gauge, a primary-side shut-off valve, a primary-side discharge valve, a secondary-side discharge valve, a passive discharger, a secondary-side shut-off valve, and a controller configured to, when the pressure measured by the secondary-side pressure gauge reaches or exceeds a specific value, place the primary-side shut-off valve and the secondary-side shut-off valve into a closed state and the primary-side discharge valve and the secondary-side discharge valve into an open state.. ... Jfe Steel Corporation

Grain-oriented electrical steel sheet and manufacturing method therefor

A grain-oriented electrical steel sheet has a coating on a surface thereof. The coating has a composite elastic modulus of 60 gpa to 95 gpa and a film thickness of 1.0 μm or more, and a tension applied to the grain-oriented electrical steel sheet by the coating is 6.0 mpa or more, and an amount of iron loss degradation between before and after roll reduction when the grain-oriented electrical steel sheet is roll-reduced at a linear pressure of 68.6 n/cm is 0.010 w/kg or less in w17/50.. ... Jfe Steel Corporation

Method for producing non-oriented electrical steel sheet having excellent magnetic properties (as amended)

Methods for producing non-oriented electrical steel sheets comprising steps including hot rolling a slab having a chemical composition comprising c: not more than 0.01 mass %, si: not more than 6 mass %, mn: 0.05-3 mass %, p: not more than 0.2 mass %, al: not more than 2 mass %, n: not more than 0.005 mass %, s: not more than 0.01 mass %, ga: not more than 0.0005 mass %, and the remainder being fe and inevitable impurities, pickling without conducting hot band annealing or after conducting hot band annealing or self-annealing, subjecting to one or more cold rollings including an intermediate annealing therebetween and a finish annealing, and forming an insulation coating, an average heating rate from 500 to 800° c. In the heating process of the finish annealing is not less than 50° c./s, whereby a non-oriented electrical steel sheet having excellent magnetic properties is obtained even if hot band annealing is omitted.. ... Jfe Steel Corporation

Reduced iron powder and method for preparing same and bearing

Reduced iron powder that has fewer coarse inclusions, has excellent formability, has high porosity after sintering, has excellent reactivity per unit mass, and can be effectively used as reaction material even to the particle inside is provided. Reduced iron powder has an apparent density of 1.00 mg/m3 to 1.40 mg/m3.. ... Jfe Steel Corporation

08/09/18 / #20180221941

Apparatus for manufacturing metal thin strip

A single roll type apparatus manufactures a metal thin strip by injecting a molten metal onto a cooling roll outer peripheral face solidifying it to manufacture the strip. An airflow blocking device for blocking the airflow along the cooling roll surface is at a molten metal injection nozzle upstream side for injecting the molten metal in the cooling roll rotation direction, and a carbon dioxide gas injection nozzle for forming a carbon dioxide flow on the cooling roll outer peripheral surface between the airflow blocking device and molten metal injection nozzle or forming a carbon dioxide atmosphere on the cooling roll surface between the airflow blocking device and the molten metal injection nozzle is disposed, and a foreign material removal device for removing foreign material attached to the cooling roll surface is disposed at an upstream side of the airflow blocking device in the rotation direction of the cooling roll.. ... Jfe Steel Corporation

08/02/18 / #20180216219

Method for manufacturing hot-pressed member

A method for manufacturing a hot-pressed member the method includes heating a zinc-based coated steel sheet to a temperature range from an ac3 transformation temperature to 1000° c., performing hot pressing work, and performing cooling, in which a surface-cleaning treatment is performed on the zinc-based coated steel sheet before the heating step is performed.. . ... Jfe Steel Corporation

07/19/18 / #20180202023

Hot rolled ferritic stainless steel sheet, hot rolled and annealed ferritic stainless steel sheet and method for manufacturing the same

Provided are a hot rolled ferritic stainless steel sheet and a hot rolled and annealed ferritic stainless steel sheet and methods for manufacturing these steel sheets. A hot rolled ferritic stainless steel sheet having a chemical composition containing, by mass %, c: 0.005% to 0.060%, si: 0.02% to 0.50%, mn: 0.01% to 1.00%, p: 0.04% or less, s: 0.01% or less, cr: 15.5% to 18.0%, al: 0.001% to 0.10%, n: 0.005% to 0.100%, ni: 0.1% to 1.0%, and the balance being fe and inevitable impurities and an absolute value of planar anisotropy in terms of modulus of longitudinal elasticity below of 35 gpa or less.. ... Jfe Steel Corporation

07/19/18 / #20180202021

Non-oriented electrical steel sheet and method of producing same

Iron loss is reduced by increasing magnetic flux density. A non-oriented electrical steel sheet has a chemical composition containing, by mass %, c: 0.0050% or less, si: 1.50% or more and 4.00% or less, al: 0.500% or less, mn: 0.10% or more and 5.00% or less, s: 0.0200% or less, p: 0.200% or less, n: 0.0050% or less, and o: 0.0200% or less, with the balance consisting of fe and inevitable impurities, in which the steel sheet has an ar3 transformation temperature of 700° c. ... Jfe Steel Corporation

07/19/18 / #20180202018

Grain-oriented electrical steel sheet and method for producing the same

In the production of a grain-oriented electrical steel sheet by hot rolling a slab containing si: 2.0-8.0 mass % and no inhibitor-forming ingredients, cold rolling, subjecting to a decarburization annealing, applying an annealing separator composed mainly of mgo and containing a ti compound(s) and subjecting to a finish annealing, an atmosphere in the heating process of the decarburization annealing is rendered into a dry atmosphere having a dew point of not higher than 0° c. And a ti amount (ti(a)) and a n amount (n(a)) contained in an iron matrix after the removal of a forsterite coating and a ti amount (ti(b)) and a n amount (n(b)) contained in the steel sheet having a forsterite coating are made to satisfy relationships as n(b)≤0.0050 mass %, n(b)/n(a)≥4, and ti(b)/ti(a)≥4.. ... Jfe Steel Corporation

07/12/18 / #20180195157

Ferritic stainless steel sheet for urea scr casing (as amended)

Provided is a ferritic stainless steel sheet for a urea scr casing which is excellent in terms of corrosion resistance in a urea scr environment and which increases the durability of a urea scr casing. The steel sheet has a chemical composition containing, by mass %, c: 0.020% or less, si: 0.01% or more and 0.50% or less, mn: 0.01% or more and 0.50% or less, p: 0.040% or less, s: 0.010% or less, al: 0.01% or more and 0.20% or less, cr: 20.5% or more and 24.0% or less, cu: 0.40% or more and 0.80% or less, ni: 0.05% or more and 0.6% or less, n: 0.020% or less, one or both selected from among ti: 0.01% or more and 0.40% or less and nb: 0.01% or more and 0.55% or less, and the balance being fe and inevitable impurities, in which the relationship ti+nb×48/93≥8×(c+n) (in the relational expression, ti, nb, c, and n denote the contents (mass %) of the corresponding chemical elements) is satisfied.. ... Jfe Steel Corporation

07/12/18 / #20180195143

High-strength thin steel sheet and method of producing the same

This disclosure provides a high-strength thin steel sheet excellent in both tensile strength and elongation with small elongation anisotropy. The high-strength thin steel sheet has a specific chemical composition and a microstructure where a total area ratio of ferrite, tempered bainitic ferrite and bainitic ferrite is 40% or more and 70% or less, an area ratio of martensite is 5% or more and 30% or less, an area ratio of retained austenite is 10% or more and 35% or less, an average equivalent circular diameter of martensite and retained austenite (secondary phase) grains is 2.0 μm or less, an area ratio of secondary phase grains having an equivalent circular diameter of 2.0 μm or more is 10% or less, and an average minor axis length of secondary phase grains is 0.40 μm or less.. ... Jfe Steel Corporation

07/12/18 / #20180194696

Iron-ion supply material

An iron-ion supply material capable of efficiently supplying iron ions to plants is provided. An iron-ion supply material that acts as an iron-ion supply source for supplying iron ions contributing to plant growth comprises an iron powder having an iron content of 80% by mass or more, wherein 50% by mass or more of the whole iron powder has a particle size of 100 μm or more and 10 mm or less.. ... Jfe Steel Corporation

07/12/18 / #20180193911

Method of producing mixed powder for powder metallurgy, method of producing sintered body, and sintered body

A method of producing a mixed powder for powder metallurgy comprises: mixing an iron-based powder with a mo-containing powder and a cu-containing powder, to obtain a raw material mixed powder; heat-treating the raw material mixed powder to cause mo and cu to diffusionally adhere to a surface of the iron-based powder, to obtain a partially diffusion-alloyed steel powder; and mixing the partially diffusion-alloyed steel powder with a graphite powder, to obtain a mixed powder for powder metallurgy, wherein the iron-based powder has an average particle size of 30 μm to 120 μm, a cuprous oxide powder is used as the cu-containing powder, and the mixed powder for powder metallurgy has a chemical composition containing mo: 0.2 mass % to 1.5 mass %, cu: 0.5 mass % to 4.0 mass %, and c: 0.1 mass % to 1.0 mass %, with a balance being fe and incidental impurities.. . ... Jfe Steel Corporation

07/12/18 / #20180193908

Mixed powder for powder metallurgy, sintered body, and method of manufacturing sintered body

Provided is a mixed powder for powder metallurgy having a chemical system not using ni which causes non-uniform metallic microstructure in a sintered body. A mixed powder for powder metallurgy comprises: a partially diffusion alloyed steel powder in which mo diffusionally adheres to a particle surface of an iron-based powder; a cu powder; and a graphite powder, wherein the mixed powder for powder metallurgy has a chemical composition containing mo: 0.2 mass % to 1.5 mass %, cu: 0.5 mass % to 4.0 mass %, and c: 0.1 mass % to 1.0 mass %, with the balance consisting of fe and inevitable impurities, and the partially diffusion alloyed steel powder has: a mean particle diameter of 30 μm to 120 μm; a specific surface area of less than 0.10 m2/g; and a circularity of particles with a diameter in a range from 50 μm to 100 μm of 0.65 or less.. ... Jfe Steel Corporation

07/05/18 / #20180187088

Method for producing ferrocoke

A method for producing ferrocoke in which it is possible to use a cheap and poor-quality coal having a high ash content while suppressing the decrease of the strength in ferrocoke or formed coke and a special coal mixing is not performed with respect to the fusion frequently causing problems in the carbonization with the shaft furnace. In a method for producing ferrocoke by molding and carbonizing a mixture of coal and iron ore, the coal is a single coal or a mixture of plural coals and a non-caking or slight caking coal having a load average value of ash content of not less than 10.7% and a load average value of mean maximum reflectance of not less than 0.81% is used.. ... Jfe Steel Corporation

06/28/18 / #20180179605

Method for producing molded product for ferrocoke

A method for producing a molded product for ferrocoke, wherein a high-strength molded product for ferrocoke can be produced advantageously without making particular investment in facilities and inviting the operating troubles. In a method for producing a molded product for ferrocoke by molding a mixed starting material of coal, an iron-source material, a high-softening point binder having a softening point of not lower than 150° c., and a low-softening point binder having a softening point of lower than 150° c., at least one of the iron-source material and the high-softening point binder is previously heated to not less than a temperature lower by 20° c. ... Jfe Steel Corporation

06/28/18 / #20180178291

Iron-based sintered body and method of manufacturing the same

Provided is an iron-based sintered body having excellent mechanical properties. In the sintered body, the area fraction of pores is 15% or less and the area-based median size d50 of the pores is 20 82 m or less.. ... Jfe Steel Corporation

06/28/18 / #20180178267

Laminated core manufacturing device and laminated core manufacturing method

A laminated core manufacturing device includes: an overlapping unit configured to overlap the plurality of laminated core materials conveyed along different conveyance routes; an edge aligning unit configured to align edge positions in a width direction of the plurality of laminated core materials between the plurality of laminated core materials; an uplift prevention unit configured to prevent uplift of the plurality of laminated core materials; an edge position correction unit configured to correct the edge positions in the width direction of the plurality of laminated core materials; and a punching unit configured to punch out the plurality of laminated core materials which are overlapped by the overlapping unit and have been subjected to an edge position alignment process performed by the edge aligning unit, an uplift prevention process performed by the uplift prevention unit, and an edge position correction process performed by the edge position correction unit.. . ... Jfe Steel Corporation

06/21/18 / #20180175401

Metal sheet for separators of polymer electrolyte fuel cells, and metal sheet for manufacturing the same

A metal sheet for separators of polymer electrolyte fuel cells comprises: a substrate made of metal; and a surface-coating layer with which a surface of the substrate is coated, with a strike layer in between, wherein a coating ratio of the strike layer on the substrate is 2% to 70%, the strike layer is distributed in a form of islands, and a maximum diameter of the islands of the strike layer as coating portions is 1.00 μm or less and is not greater than a thickness of the surface-coating layer.. . ... Jfe Steel Corporation

06/21/18 / #20180171430

Ferritic stainless steel sheet and method for manufacturing the same

Provided are a ferritic stainless steel sheet and a method for manufacturing the steel sheet. The ferritic stainless steel sheet according to the present invention has a chemical composition containing, by mass %, c: 0.005% to 0.025%, si: 0.02% to 0.50%, mn: 0.55% to 1.00%, p: 0.04% or less, s: 0.01% or less, al: 0.001% to 0.10%, cr: 15.5% to 18.0%, ni: 0.1% to 1.0%, n: 0.005% to 0.025%, and the balance being fe and inevitable impurities, an elongation after fracture of 28% or more, an average r-value of 0.75 or more, and a minimum value of maximum logarithmic strain at the forming limit, which is, determined on the basis of a forming limit diagram (fld), of 0.15 or more.. ... Jfe Steel Corporation

06/21/18 / #20180171425

Grain-oriented electrical steel sheet and method for manufacturing the same

The disclosure contains, in mass % or mass ppm: c: 0.005% or less, si: 2.0% to 5.0%, mn: 0.01% to 0.5%, sol.al: 10 ppm or less, n: 15 ppm or less, s and se: each 10 ppm or less, and three or more selected from sn, sb, cr, p, mo and b whose contents satisfy a relational expression of 0.16≤[% sn]+[% sb]+[% cr]+2×[% p]+[% mo]+[% b]≤0.50, the balance being fe and inevitable impurities, where a number of times of repeated bending in a bend test is 10 or more.. . ... Jfe Steel Corporation

06/07/18 / #20180155806

High-strength thin steel sheet and method for manufacturing the same

This disclosure provides a predetermined composition, where a conversion value c* of total carbon contents in ti, nb and v precipitates whose grain sizes are less than 20 nm is 0.010 mass % to 0.100 mass %, fe content in fe precipitates is 0.03 mass % to 0.50 mass %, and an average grain size of ferrite grains whose grain sizes are top 5 % large in ferrite grain size distribution of rolling direction cross section is (4000/ts)2 μm or less, the ts indicating tensile strength in unit of mpa.. . ... Jfe Steel Corporation

06/07/18 / #20180155805

High toughness and high tensile strength thick steel plate with excellent material homogeneity and production method for same

A thick steel plate is provided by heating a continuously-cast slab, hot forging the continuously-cast slab using opposing dies having respective short sides differing such that when a short side length of a die having a shorter one of the short sides is taken to be 1, a short side length of a die having a longer one of the short sides is 1.1 to 3.0, allowing cooling to obtain a steel raw material, reheating the steel raw material, performing hot rolling of the steel raw material including at least two passes carried out, allowing cooling to obtain a thick steel plate, reheating the thick steel plate to at least the ac3 temperature and no higher than 1050° c., rapidly cooling the thick steel plate to 350° c. Or lower, and tempering the thick steel plate at at least 550° c. ... Jfe Steel Corporation

05/31/18 / #20180147663

Linear groove formation method and linear groove formation device

A linear groove formation method of forming linear grooves in a steel sheet surface using etching can form linear grooves of a uniform shape while suppressing a decrease in magnetic property of a grain-oriented electrical steel sheet caused by laser irradiation for resist removal. A linear groove formation method includes: coating a surface of a grain-oriented electrical steel sheet with a resist; performing a laser scan cyclically in a rolling direction of the grain-oriented electrical steel sheet, the laser scan being applying a laser while scanning the laser in a direction crossing the rolling direction to remove the resist in a portion irradiated with the laser; and etching the grain-oriented electrical steel sheet in each portion in which the resist is removed, to form a linear groove. ... Jfe Steel Corporation

05/24/18 / #20180142335

Steel for storage equipment and transportation equipment for ethanol (as amended)

Steel for storage equipment and transportation equipment for ethanol, the steel having a chemical composition containing, by mass %. C: 0.02% to 0.3%, si: 0.01% to 1.0%, mn: 0.1% to 2.0%, p: 0.003% to 0.03%, s: 0.01% or less, al: 0.005% to 0.100%, n: 0.0010% to 0.010%, at least one selected from w: 0.010% to 0.5% and mo: 0.010% to 0.5%, at least one selected from sb: 0.01% to 0.5% and sn: 0.01% to 0.3%, and the balance being fe and inevitable impurities, in which the ratio of the al content to the n content satisfies the relationship 2.0≤al/n≤70.0.. ... Jfe Steel Corporation

05/10/18 / #20180127856

High-strength cold-rolled steel sheet and method for 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 2.0%, mn: 1.8% to 2.5%, p: 0.10% or less, s: 0.010% or less, al: 0.10% or less, n: 0.010% or less, and the balance being fe and inevitable impurities, and a multi-phase microstructure including ferrite having an average crystal grain diameter of 5 μm or less in an amount of 30% to 55% in terms of volume fraction, retained austenite having an average crystal grain diameter of 2 μm or less in an amount of 5% to 15% in terms of volume fraction, and tempered martensite having an average crystal grain diameter of 2 μm or less in an amount of 30% to 60% in terms of volume fraction, in which the number of grains of the retained austenite existing in an area of 1000 μm2 is 10 or more.. ... Jfe Steel Corporation

05/03/18 / #20180119244

Grain-oriented electrical steel sheet, manufacturing method therefor, and method for 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 and the magnitude of velocity level change between adjacent velocity change points in an acceleration zone or deceleration zone of magnetostrictive vibration is 3.0×10−4 sec−1 or less.. ... Jfe Steel Corporation

05/03/18 / #20180119242

Method for forming linear groove on cold rolled steel strip and method for 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 converged in a point shape in the width direction of the cold rolled steel strip to form a photosensitive portion; and then removing the photosensitive portion of the resist film with a developing solution. Subsequently, by dissolving and removing by etching a portion of the steel strip below the removed portion of the resist coating, a fine and uniform linear groove can be formed in a surface of the steel strip.. ... Jfe Steel Corporation

05/03/18 / #20180119240

Hot rolled steel sheet and method of 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 10% or less, the tempered bainite phase and the tempered martensite phase have laths with an average width of 1.0 μm or less as a substructure, a proportion of fe-based carbides with an aspect ratio of 5 or less in fe-based carbides precipitated inside and at boundaries of the laths is 80% or more, and mc-type carbides with an average particle size of 20 nm or less are dispersed and precipitated inside and at the boundaries of the laths; and an average dislocation density of 1.0×1014 m−2 or more and 5.0×1015 m−2 or less.. . ... Jfe Steel Corporation

04/19/18 / #20180105919

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 and 0.40% or less, v: 0.02% or more and 0.5% or less, nb: 0.003% or more and 0.20% or less, al: 0.010% or more and 2.0% or less, ti: more than 0.005% and less than 0.025%, n: 0.0200% or less, sb: 0.0005% or more and 0.02% or less, and the balance consisting of fe and incidental impurities; and a steel microstructure that contains bainite phase in an area ratio of more than 50%.. . ... Jfe Steel Corporation

04/19/18 / #20180105916

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. In a continuous hot-dip metal coating method, oxidizing gas is supplied into a snout 14, a temperature of an inner wall surface of the snout is maintained at 150° c. ... Jfe Steel Corporation

04/19/18 / #20180105907

Thick steel plate for structural pipes or tubes, method of 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 amounts of alloying elements. The thick steel plate for structural pipes or tubes disclosed herein has: a specific chemical composition; a microstructure at its mid-thickness part that is a dual-phase microstructure of ferrite and bainite with an area fraction of the ferrite being less than 50%, and that contains ferrite grains with a grain size of 15 μm or less in an area fraction of 80% or more with respect to the whole area of the ferrite; a tensile strength of 620 mpa or more; and a charpy absorption energy ve−20+ c. ... Jfe Steel Corporation

04/19/18 / #20180104763

Method of monitoring manufacturing status of electric resistance welded pipe, device for monitoring manufacturing status of electric resistance welded pipe, and method of 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 having an opening opposing a region in which both of the end parts of the steel strip in the width direction are butt welded and shielding the region with inert gas by ejecting the inert gas onto the region through the opening, the imaging unit having a visual filed including the region; and determining quality of a butt-welded part based on an image shot by the imaging unit.. . ... Jfe Steel Corporation

04/19/18 / #20180104731

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

04/12/18 / #20180100212

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 formed by one or more inclusion particles, the one or more inclusion particles having a major axis length of 0.3 μm or more and extending and/or distributed in a dot-sequence manner along a rolling direction; a number of carbides mainly composed of fe having a predetermined size is at most 3,500/mm2; a number of carbides that are distributed in the tempered martensite and/or in the bainite and that have a diameter of 10 nm to 50 nm is at least 0.7×107/mm2; and prior γ grains have a mean grain size of 18 μm or less.. . ... Jfe Steel Corporation

03/29/18 / #20180087158

Insulation-coated oriented magnetic steel sheet and method for 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 insulating coat containing si, p, o, and cr, and at least one element selected from the group consisting of mg, ca, ba, sr, zn, al, and mn. ... Jfe Steel Corporation

03/29/18 / #20180085811

Press-forming method, method of 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 a hat-shaped or u-shaped cross section through a hat-shaped cross-sectional form having a top portion, vertical wall portions connecting at their upper end parts to both end parts of the top portion through fillet portions, and flange portions connecting at their internal end parts to the lower end parts of the vertical wall portions through fillet portions, and a material movement in the flange portion of the curved portion is caused in the drawing to mitigate tensile deformation or compression deformation in the circumferential direction generated in the flange portion of the curved portion.. . ... Jfe Steel Corporation

03/22/18 / #20180083294

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. A metal sheet for separators of polymer electrolyte fuel cells includes: a substrate made of metal; and a surface-coating layer with which the substrate is coated, with a strike layer in between, wherein a coating weight of the strike layer is 0.001 g/m2 to 1.0 g/m2.. ... Jfe Steel Corporation

03/22/18 / #20180080287

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 section of a first thread series, which is the original critical cross-section site. ... Jfe Steel Corporation

03/22/18 / #20180080127

Insulating-coated oriented magnetic steel sheet and method for 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. ... Jfe Steel Corporation

03/22/18 / #20180080100

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 than 1.0 μm in the martensite phase is 5%-30%; the area ratio of crystal grains having an average crystal grain diameter of 1.0-4.0 μm is 70%-95%; and the area ratio of crystal grains having an average crystal grain diameter of more than 4.0 μm is less than 5%.. ... Jfe Steel Corporation

03/22/18 / #20180080099

High-strength steel sheet and method for 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% or less, s: 0.020% or less, al: 0.01% or more and 0.10% or less, n: 0.010% or less, nb: 0.005% or more and less than 0.070%, and the balance being fe and inevitable impurities; and a microstructure including, by area: ferrite: 85% or more, pearlite: 0% to 15%, and a total of martensite, retained austenite and cementite: 0% to 3%. ... Jfe Steel Corporation

03/22/18 / #20180078993

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 side wall portions approach each other by pressing a punch into a space between a pair of dies while clamping the portion corresponding to the bottom portion between the punch and a pad in a plate thickness direction; and bending the corresponding portions along the bend-facilitating lines by pressing the corresponding portions against an outer periphery of a plug having an outer peripheral shape the same as a final shape of the closed cross-sectional structure while the plug is placed on the portion of the workpiece corresponding to the bottom portion.. . ... Jfe Steel Corporation

03/15/18 / #20180071826

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 point) higher than the surface temperature of the metal powder in addition to the cooling and the secondary cooling is performed from a temperature range where the temperature of the metal powder after the cooling is not lower than the cooling start temperature necessary for amorphization nor higher than the minimum heat flux point (mhf point).. . ... Jfe Steel Corporation

03/08/18 / #20180066346

Grain-oriented electrical steel sheet and method for 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 the time required after final annealing to reduce the temperature of a secondary recrystallized sheet from 800° c. ... Jfe Steel Corporation

03/08/18 / #20180066333

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 coating, the cooling from 700° c. To 500° c. ... Jfe Steel Corporation

03/08/18 / #20180066332

High-strength steel, method for manufacturing high-strength steel, steel pipe, and method for 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 wherein ts0 is defined as tensile strength determined at a temperature of 350° c. ... Jfe Steel Corporation

03/08/18 / #20180065339

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). ... Jfe Steel Corporation

03/08/18 / #20180065164

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 a flange portion subjected to shrink flange deformation is a line length l1 in the cross-sectional direction that is shorter than a line length l2, where the line length l2 is a line length in a cross-sectional direction of the joining portion of the second press forming tool for making the product shape; and a second forming step of forming the press formed part in the product shape by crash forming by using the second press forming tool in which the line length in the cross-sectional direction of the joining portion is l2.. . ... Jfe Steel Corporation

03/01/18 / #20180057956

Method for forming linear groove on steel strip and method for 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 mask member in synchronization with a traveling speed of the steel strip, the mask member being configured to cover a surface of the resist coating to block light, to thereby solidify a portion of the resist coating not covered with the mask member to form a solidified portion; and removing an unsolidified portion other than the solidified portion with a developing solution. Subsequently, by dissolving and removing by etching a portion of the steel strip below the removed portion of the resist coating, a fine and uniform linear groove can be formed in a surface of the steel strip.. ... Jfe Steel Corporation

03/01/18 / #20180057919

High-strength cold-rolled steel sheet and method for 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: 0.0050% or less, nb: 0.010% to 0.060%, ti: 0.010% to 0.030%, b: 0.0005% to 0.0030%, sb: 0.005% to 0.015%, ca: 0.0015% or less, cr: 0.01% to 2.00%, mo: 0.01% to 1.00%, ni: 0.01% to 5.00%, cu: 0.01% to 5.00%, and the balance being fe and inevitable impurities, a metallurgical microstructure including a ferrite phase in an amount of 30% or more in terms of area fraction, at least one selected from a bainite phase and a martensite phase in an amount of 40% to 65% in total in terms of area fraction, and a cementite in an amount of 5% or less in terms of area fraction at a position located at ¼ of the thickness from the surface of the steel sheet, and a metallurgical microstructure including a ferrite phase in an amount of 40% to 55% in terms of area fraction at a position located at 50 μm in the thickness direction from the surface of the steel sheet and a method for manufacturing the steel sheet.. . ... Jfe Steel Corporation

03/01/18 / #20180057916

Thin high-strength cold-rolled steel sheet and method of 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 to 800° c. ... Jfe Steel Corporation

03/01/18 / #20180057908

High-strength, high-toughness steel plate and method for 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%, and n: 0.001% to 0.006%, and further includes at least one selected from cu: 0.01% to 1.00%, ni: 0.01% to 1.00%, cr: 0.01% to 1.00%, mo: 0.01% to 1.00%, v: 0.01% to 0.10%, and b: 0.0005% to 0.0030%, with the balance being fe and unavoidable impurities. In a surface portion and a central portion in the thickness direction, the area fraction of martensite-austenite constituent is less than 3% and the area fraction of bainite is 90% or more, and in the central portion in the thickness direction, the average particle size of cementite in bainite is 0.5 μm or less.. ... Jfe Steel Corporation

03/01/18 / #20180057907

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 ratio of 1.0-1.5 in the martensite phase is 40%-100%, by area ratio.. ... Jfe Steel Corporation

03/01/18 / #20180057906

Steel plate for structural pipes or tubes, method of 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, without addition of large amounts of alloying elements. The steel plate for structural pipes or tubes disclosed herein has a specific chemical composition, in which the steel plate has mechanical properties including: (a) a 0.5% yield strength of 555 mpa or more; (b) a tensile strength of 625 mpa or more; and (c) a charpy absorption energy ve−10° c. ... Jfe Steel Corporation

03/01/18 / #20180057905

Steel plate for structural pipes or tubes, method of 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 rolling direction (exhibiting high material homogeneity) without addition of large amounts of alloying elements. The steel plate for structural pipes or tubes disclosed herein has: a specific chemical composition; a microstructure mainly composed of bainite and containing martensite austenite constituent in an area fraction of less than 3.0%; a tensile strength in the rolling direction of 760 mpa or more; and tsc−tsl being 30 mpa or less in terms of absolute value, where tsc denotes a tensile strength in a direction perpendicular to the rolling direction.. ... Jfe Steel Corporation

02/22/18 / #20180051363

Thick steel plate for structural pipes or tubes, method of 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 addition of large amounts of alloying elements. The thick steel plate for structural pipes or tubes disclosed herein has: a specific chemical composition; a microstructure mainly composed of bainite; a tensile strength of 620 mpa or more; a charpy absorption energy ve−20° c. ... Jfe Steel Corporation

02/22/18 / #20180051362

Steel sheet for crown cap, method for 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% to less than 0.50%, p: 0.050% or less, s: 0.050% or less, al: more than 0.002% to less than 0.070%, n: less than 0.0040%, and b: 0.0005% to 0.0020% on a mass basis, the balance being fe and inevitable impurities, and also has a yield strength of 500 mpa or more in a rolling direction, an average lankford value (r) of 1.1 or more, and an in-plane anisotropy (Δr) of lankford value of −0.3 to 0.3.. ... 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 temperature. Mixed gas of humidified gas and dry gas, and dry gas are supplied to a soaking zone in an annealing furnace. ... Jfe Steel Corporation

02/15/18 / #20180044753

High-strength steel sheet and method for 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%, mn: less than 1.0%, p: 0.10% or less, s: 0.020% or less, al: 0.01% or more and 0.10% or less, n: 0.010% or less, nb: 0.005% or more and less than 0.070%, and the balance being fe and inevitable impurities. ... Jfe Steel Corporation

02/15/18 / #20180044751

High-strength cold-rolled steel sheet and method for 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 2.20%, mn: 1.50% to 2.50%, p: 0.05% or less, s: 0.005% or less, al: 0.10% or less, n: 0.007% or less, at least one of ti and nb, and the balance being fe and inevitable impurities, wherein the combined mass % of ti and nb is 0.04% to 0.15%, and a multi-phase microstructure including ferrite having an average crystal grain diameter of 3 μm or less in an amount of 45% to 65% in terms of volume fraction, tempered martensite having an average crystal grain diameter of 2 μm or less in an amount of 35% to 55% in terms of volume fraction, and optionally non-recrystallized ferrite having an average crystal grain diameter of 5 μm or less in an amount of 5% or less.. ... Jfe Steel Corporation

02/15/18 / #20180044748

Steel material for composite pressure vessel liner, steel pipe or tube for composite pressure vessel liner, and method of 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 comprises: a chemical composition containing, in mass %, c: 0.10% to 0.60%, si: 0.01% to 2.0%, mn: 0.1% to 5.0%, p: 0.0005% to 0.060%, s: 0.0001% to 0.010%, n: 0.0001% to 0.010%, and al: 0.01% to 0.06%, with a balance being fe and incidental impurities; and a metallic microstructure in which a mean grain size of prior austenite grains is 20 μm or less, and a total area ratio of martensite and lower bainite is 90% or more.. ... 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, and oxygen is blown from a downstream lance on the downstream side in a hot air blast direction, so that oxygen used for preceding combustion of the lng is supplied from the downstream lance, and the pulverized coal whose temperature has been increased by the combustion of the lng is combusted along with the supplied oxygen. ... Jfe Steel Corporation

02/15/18 / #20180043466

Friction stir welding apparatus for 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. ... 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 to the electrodes according to the electrode force measured by the electrode force gauge. ... Jfe Steel Corporation

02/15/18 / #20180043459

Resistance spot welding method and method for 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 the actual welding, a current pattern is divided into two or more steps including a first current passage step and a second current passage step subsequent to the first current passage step, and, in the actual welding, a current that causes no expulsion is selected to perform welding by constant current control in the first current passage step, and adaptive control welding is performed from the subsequent second current passage step onward.. . ... 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 20 ms and 80 ms inclusive, a suspension of the electric current supply of from 20 ms to 60 ms inclusive is started. ... Jfe Steel Corporation

02/08/18 / #20180037969

High-strength cold-rolled steel sheet and method of 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] represent si and mn contents, wherein the steel sheet has a structure including, in terms of area fraction, 60% to less than 100% of tempered martensite, 5% or less including 0% of untransformed austenite, and the balance being ferrite, and the ferrite has an average crystal grain size of less than 3.5 μm, wherein less than 10 particles/100 μm2 of si—mn compound oxide particles having a circle equivalent diameter of 5 μm or less are present on a surface of the steel sheet, and the surface is covered with si-based oxide at a coverage of 1% or less.. . ... Jfe Steel Corporation

02/08/18 / #20180037966

Grain-oriented electrical steel sheet and method for 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 when the steel sheet is excited to 1.0 t at 50 hz in a rolling transverse direction, a magnetizing force (td-h10) and an iron loss (td-w10) are respectively (td-h10)≧200 a/m and (td-w10)≧1.60 w/kg. Thus, a grain-oriented electrical steel sheet having excellent transformer core loss can be obtained industrially stably at low cost.. ... 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. ... Jfe Steel Corporation

02/08/18 / #20180036830

Electric resistance welded steel pipe having identifiable seam portion and method for 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. ... Jfe Steel Corporation

02/01/18 / #20180031501

Evaluating method for coal and producing method for 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 coal used as a raw material for coke and includes using a physical property value relating to a thermoplasticity of a coal as an index for evaluating the coal, wherein a primary or secondary amine including an aromatic ring have been added to the coal, thereby enhancing the thermoplasticity of the coal.. ... Jfe Steel Corporation

02/01/18 / #20180030612

Method for continuous electrolytic etching of grain oriented electrical steel strip and apparatus for 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 position sensor and centering apparatus, which are placed immediately upstream of an electrolytic etching apparatus; and performing an electrolytic etching process in which electrolytic etching is performed in the electrolytic etching apparatus to form a linear groove on the surface of the grain oriented electrical steel strip by passing electric current between a conductor roll and electrode placed in an electrolytic bath while the grain oriented electrical steel strip is brought into contact with the conductor roll, the grain oriented electrical steel strip is immersed in the electrolytic bath and the grain oriented electrical steel strip is facing the electrode.. . ... 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. ... Jfe Steel Corporation

02/01/18 / #20180030565

High-strength galvanized steel sheet and method for 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 the balance being fe and inevitable impurities, in which the relationship ti>4n is satisfied, and a microstructure including, in terms of area ratio in a cross section located at ¼ of the thickness from the surface of a base steel sheet, a ferrite phase in an amount of 70% or less (including 0%), a bainite phase in an amount of 20% or less (including 0%), a martensite phase in an amount of 25% or more, and a retained austenite phase in an amount of less than 3% (including 0%), in which the average crystal grain diameter of the martensite phase is 20 μm or less, and in which a variation in the vickers hardness of the martensite phase is 20 or less in terms of standard deviation, as well as a method for manufacturing the steel sheet, is disclosed.. . ... Jfe Steel Corporation

02/01/18 / #20180030564

High-strength galvanized steel sheet and method for 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 less, a retained austenite phase: 2% or more and 15% or less, and other phases: 10% or less (including 0%), the other phases comprising a martensite phase: 3% or less (including 0%) and a bainitic ferrite phase: less than 5% (including 0%), the tempered martensite phase having an average grain size of 8 μm or less, the ferrite phase having an average grain size of 5 μm or less, and the retained austenite phase having a c content less than 0.7% by mass.. ... 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% to 0.020%, and n: 0.0150% or less in a predetermined range, and further containing al: 0.010%≦al≦0.120% in the case where b−(10.8/14)n ≦0.0003%, and 27/14[(n−(14/10.8)b+0.030]≦al≦0.120% in the case where b−(10.8/14)n<0.0003%.. ... Jfe Steel Corporation

02/01/18 / #20180030559

Grain-oriented electrical steel sheet and method for 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 property is provided without coating damage even when magnetic domain refining treatment by thermal strain is performed.. ... 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 0.005%, ni: not more than 3%, cr: not more than 5%, ti: not more than 0.005%, nb: not more than 0.003%, as: not more than 0.005% and o: not more than 0.005%, subjecting to one cold rolling or two or more cold rollings interposing an intermediate annealing therebetween after conducting a hot band annealing or without conducting a hot band annealing and subjecting to a finish annealing, an average heating rate from 600° c. To 700° c. ... Jfe Steel Corporation

02/01/18 / #20180030557

High-strength electric resistance welded steel pipe and method for 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 0.030%, and al: 0.010% to 0.050%, the balance being fe and unavoidable impurities, and a microstructure including polygonal ferrite with a volume fraction of 70% or more and retained austenite with a volume fraction of 3% to 20%, the balance being at least one selected from martensite, bainite, and pearlite, wherein the polygonal ferrite has an average grain size of 5 μm or more and an aspect ratio of 1.40 or less.. . ... 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 of other polyol components in the polyol component, and a main layer and an upper layer of the laminated resin layer include polyester containing 90 mol % or more of terephthalic acid in the polycarboxylic acid component and 90 mol % or more of 1,4-butanediol in the polyol component, has a total thickness of 3 to 25 μm, and has a ratio (i011/i100) of peak intensity (i011) observed in a range of 2θ=15.5 degrees to 17.0 degrees to peak intensity (i100) observed in a range of 2θ=22.5 degrees to 24.0 degrees in x-ray analysis in a range of 0.2 to 5.0.. . ... 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

01/25/18 / #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 the hardly softening coal can be a coal having a button index (csn) of 1.0 and a volatile matter of not less than 17%, and the easily softening coal can be a coal satisfying that a value obtained by multiplying csn of easily softening coal by a blending ratio of easily softening coal in all coals is a range of 0.3-5.2. ... Jfe Steel Corporation

01/25/18 / #20180023163

High-strength welded steel pipe for airbag inflator and method for 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 0.1%, n: 0.01% or less, ti: 0.01 to 0.20%, and v: 0.01 to 0.50%, with the balance being fe and incidental impurities. ... 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. ... 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. ... Jfe Steel Corporation

01/25/18 / #20180023158

High-strength heavy-walled stainless steel seamless tube or pipe and method of 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 steel microstructures in a circumferential direction cross section and an l direction (rolling direction) cross section of the steel tube or pipe is 3,000 μm2 or less and the content of ferrite grains having areas of 800 μm2 or less is 50% or more on an area fraction basis, where, when adjacent ferrite grains are present in the steel microstructure and the crystal misorientation between one ferrite grain and the other ferrite grain is 15° or more, the adjacent grains are assumed to be grains different from each other.. . ... Jfe Steel Corporation

01/25/18 / #20180023154

High-strength galvanized steel sheet and method for 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 the balance being fe and inevitable impurities, in which the relationship ti>4n is satisfied, and a microstructure including, in terms of area ratio in a cross section located at ¼ of the thickness from the surface of a base steel sheet, a ferrite phase in an amount of 70% or less (including 0%), a bainite phase and a tempered bainite phase in an amount of 20% or less (including 0%) in total, a tempered martensite phase in an amount of 25% or more, and a retained austenite phase in an amount of less than 3% (including 0%), in which the average crystal grain diameter of the tempered martensite phase is 20 μm or less, in which a variation in the vickers hardness of the tempered martensite phase is 20 or less in terms of standard deviation, and in which the number density of carbides having a minor axis length of 0.05 μm or more in the tempered martensite phase is 3×106 particles/mm2 or less, as well as a method for manufacturing the steel sheet, is disclosed.. . ... 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 tube, and lng is blown from a downstream lance 6 on the downstream side in a hot air blast direction, so that oxygen to be used for combustion of the lng is supplied from the upstream lance 4, and the pulverized coal whose temperature has been increased by the combustion of the lng is combusted along with the supplied oxygen or oxygen in an air blast. ... 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 connecting portion and being structured so that either all or a part of the side wall portion curves toward an outside of the press-formed product to form a convex shape in a planar view, the press forming method including forming the side wall portion while keeping a tip end portion of the blank in continuous contact with a side wall forming portion of the die and causing the die to impose no restraint on any part other than the tip end portion of the blank.. . ... Jfe Steel Corporation

01/18/18 / #20180017868

Manufacturing method for 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 having a linear shape. ... 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 coals. ... 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%, si: 0.6% to 2.0%, mn: 1.3% to 3.0%, p: 0.10% or less, s: 0.030% or less, al: 2.0% or less, n: 0.010% or less, and one or more of ti, nb, and v: 0.01% to 1.0% each, with a balance being fe and incidental impurities; a ferrite microstructure of 50% or more in area ratio; an amount of precipitated fe of 0.04 mass % or more; and a precipitate with a particle size of less than 20 nm, wherein c* and c*p satisfy specific conditions.. ... 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. ... Jfe Steel Corporation

01/11/18 / #20180009050

Welding structure of press formed part, structural part for automotive body including the welding structure, and method for 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 projection projecting outwardly on a tip end portion of a side wall portion of a lower side part, partially or entirely on a joining surface. A tip end side of the step portion is fitted into the opening portion of an upper side part, and the step portion of the lower side part and the tip end of a side wall portion of the upper side part are linearly joined by arc welding.. ... Jfe Steel Corporation

01/04/18 / #20180002800

High-strength galvanized steel sheet and method for 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 and 2.5% or less, and fe and inevitable impurities. The steel sheet having a microstructure containing, by an area percentage basis, a tempered martensite phase: 30% or more and 73% or less, a ferrite phase: 25% or more and 68% or less, a retained austenite phase: 2% or more and 20% or less, and other phases: 10% or less (including 0%), the other phases containing a martensite phase: 3% or less (including 0%) and a bainitic ferrite phase: less than 5% (including 0%).. ... Jfe Steel Corporation

01/04/18 / #20180002789

Non-oriented electrical steel sheet and method for 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 a hot rolled sheet, cold rolling the hot rolled sheet without conducting a hot band annealing and then subjecting to a finish annealing, a compositional ratio of cao in oxide-based inclusions existing in the slab defined by cao/(sio2+al2o3+cao) is set to not less than 0.4 and/or a compositional ratio of al2o3 defined by al2o3/(sio2+al2o3+cao) is set to not less than 0.3, and a coiling temperature in the hot rolling is set to not lower than 650° c.. ... Jfe Steel Corporation

01/04/18 / #20180002778

High-strength steel sheet and method for 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 a bainite phase and/or a martensite phase, and 5% or less of cementite, in which, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 5% to 20%, and a tensile strength is 1180 mpa or more.. ... Jfe Steel Corporation

01/04/18 / #20180002777

High-strength steel sheet and method for 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 a bainite phase and/or a martensite phase, and 5% or less of cementite, in which, in a surface layer that is a region within 50 μm from the surface in the thickness direction, the area ratio of a ferrite phase is 40% to 55% and the total area ratio of a bainite phase having a grain diameter of more than 5 μm and/or a martensite phase having a grain diameter of more than 5 μm is 20% or less, and a tensile strength is 980 mpa or more.. ... Jfe Steel Corporation

01/04/18 / #20180002773

Grain-oriented electrical steel sheet and method of 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 form of osbornite, observed in a range of 42°<2θ<43° and a peak value pmg2sio4 of mg2sio4 in the form of forsterite, observed in a range of 35°<2θ<36° of both more than 0 and satisfying a relationship ptin≧pmg2sio4, in thin-film x-ray diffraction analysis; and an iron loss w17/50 of 1.0 w/kg or less.. ... Jfe Steel Corporation

01/04/18 / #20180001377

Continuous casting method of 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 at a cooling water spray amount w0 [kg/ton-cast slab]. ... Jfe Steel Corporation

01/04/18 / #20180001369

Punching method, punching device, and method for 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 to 400, and an average crystal grain size of the sheets is set to be 50 to 250 μm, a clearance of the mold is set to be 7% or more of a minimum sheet thickness of the sheet thicknesses of the electrical steel sheets and equal to or lower than 7% of a total sheet thickness of the electrical steel sheets, and a pressure that a sheet presser of the mold applies to the electrical steel sheets is set to be 0.10 mpa or more.. . ... Jfe Steel Corporation








ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009



###

This listing is an abstract for educational and research purposes is only meant as a recent sample of applications filed, not a comprehensive history. Freshpatents.com is not affiliated or associated with Jfe Steel Corporation in any way and there may be associated servicemarks. This data is also published to the public by the USPTO and available for free on their website. Note that there may be alternative spellings for Jfe Steel Corporation with additional patents listed. Browse our Agent directory for other possible listings. Page by FreshPatents.com

###