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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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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

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

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

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

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

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

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

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

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

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

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

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

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

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

12/28/17 / #20170369963

Seamless stainless steel pipe for oil country tubular goods and method of 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 cooling rate of air cooling or more, thereafter, performing quenching by heating the seamless steel pipe to a temperature of 850° c. Or above, subsequently, cooling the seamless steel pipe to a temperature of 100° c. ... Jfe Steel Corporation

12/28/17 / #20170369962

High strength thick-walled elecric-resistance-welded steel pipe for deep-well conductor casing, method for 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, nb: 0.010% to 0.100%, and ti: 0.001% to 0.050%. ... Jfe Steel Corporation

12/28/17 / #20170369958

Thick-walled high-toughness high-strength steel plate and method for 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 has a thickness of 100 mm or more.. ... Jfe Steel Corporation

12/28/17 / #20170368590

Punch processing method for laminated iron core and method for 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 a closed curved line corresponding to an outermost periphery of the laminated iron core and a second fixing part that is positioned in a portion that finally serves as the laminated iron core; and performing punch processing on the outermost periphery of the laminated iron core while the steel sheets are stacked.. . ... Jfe Steel Corporation

12/21/17 / #20170362678

High strength thick-walled electric-resistance-welded steel pipe for deep-well conductor casing, method for 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, nb: 0.010% to 0.100%, and ti: 0.001% to 0.050%. ... 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 is subjected to continuous cold roll forming to obtain a pipe-shaped body. ... 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 to the composition of the low-carbon martensitic stainless steel pipes. ... 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% to 0.60% of ni; 0.20% to 0.70% of nb; 0.005% to 0.020% of n; and the balance being fe and incidental impurities, in which a nitrogen-enriched layer is present that has a nitrogen concentration peak value of 0.03 mass % to 0.30 mass % at a depth of within 0.05 μm of a surface of the steel.. . ... 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: 15.5% to 18.0%, ni: 0.01% to 1.0%, al: 0.001% to 0.10%, and n: 0.005% to 0.06%, with a balance being fe and incidental impurities; and a microstructure containing a martensite phase of 1% to 10% in volume fraction with respect to a whole volume of the microstructure.. ... Jfe Steel Corporation

12/07/17 / #20170349965

Method of quenching steel pipe, apparatus for quenching steel pipe, method of 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 using a simple unit. Movements of a heated steel pipe in a direction parallel to and in a direction perpendicular to a pipe axis of the steel pipe are stopped, and cooling water is jetted onto an outer surface of the steel pipe from four or more spray nozzles arranged spirally outside the steel pipe while rotating the steel pipe about the pipe axis.. ... Jfe Steel Corporation

12/07/17 / #20170349964

High-strength seamless steel pipe for oil country tubular goods and method of 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% to 3.0% or less, v: 0.05% to 0.3%, nb: 0.001% to 0.020%, b: 0.0003% to 0.0030%, o: 0.0030% or less, and ti: 0.003% to 0.025%, and wherein ti/n: 2.0 to 5.0 is satisfied, a volume fraction of a tempered martensitic is 95% or more, prior austenite grains have a grain size number of 8.5 or more, and in a cross-section perpendicular to a rolling direction, the number of nitride-based inclusions having a grain size of 4 m or more is 100 or less per 100 mm2, the number of nitride-based inclusions having a grain size of less than 4 μm is 1000 or less per 100 mm2, the number of oxide-based inclusions having a grain size of 4 μm or more is 40 or less per 100 mm2, and the number of oxide-based inclusions having a grain size of less than 4 μm is 400 or less per 100 mm2, and methods of producing the same.. . ... Jfe Steel Corporation

12/07/17 / #20170349963

High-strength seamless steel pipe for oil country tubular goods and method of 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, v: 0.01% to less than 0.05%, nb: 0.001% to less than 0.01%, b: 0.0003% to 0.0030%, o: 0.0030% or less, and ti: 0.003% to 0.025%, and wherein ti/n: 2.0 to 5.0 is satisfied, a volume fraction of a tempered martensitic is 95% or more, prior austenite grains have a grain size number of 8.5 or more, and in a cross-section perpendicular to a rolling direction, the number of nitride-based inclusions having a grain size of 4 μm or more is 100 or less per 100 mm2, the number of nitride-based inclusions having a grain size of less than 4 μm is 1000 or less per 100 mm2, the number of oxide-based inclusions having a grain size of 4 μm or more is 40 or less per 100 mm2, and the number of oxide-based inclusions having a grain size of less than 4 μm is 400 or less per 100 mm2.. . ... Jfe Steel Corporation

12/07/17 / #20170348790

Steel sheet assembly, method of 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 either or both of the steel sheets to be lapped and then welding the steel sheets. A weld of the assembly has a nugget diameter of 2.8√t (mm) or more, where t (mm) denotes the thickness of a thinner one of the steel sheets on both sides of a weld interface, and the amount of c is increased by 0.02 % by mass or more as compared to the steel sheets before being applied with the adhesive and the carbon-supplying agent.. ... Jfe Steel Corporation

11/30/17 / #20170342519

Material for laminated iron core, and method of 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 [μm] or less, and a sheet thickness deviation in a sheet width direction of at least a portion used as the laminated iron core is 3 [μm] or less per 500 [mm], the portion being of the steel sheets forming the material for laminated iron cores.. ... Jfe Steel Corporation

11/23/17 / #20170337304

Method of evaluating hot stamped part and method of 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 performed using a computer, wherein in the evaluation step, a maximum micro-crack depth in the hot stamped part manufactured under a forming condition set in the forming condition setting step is evaluated using a correlation, obtained beforehand, between an equivalent plastic strain in a surface layer of the hot stamped part and the maximum micro-crack depth in the hot stamped part.. . ... Jfe Steel Corporation

11/23/17 / #20170336336

Quantitative analysis device for trace carbon and quantitative analysis method for 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 for detecting characteristic x-rays of carbon in the sample are provided.. ... 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%, al: 0.020% to 0.070%, n: less than 0.0040%, and the balance being fe and inevitable impurities, wherein yield strength after heat treatment at 210° c. For 15 minutes is as follows: the yield strength is 550 mpa or more in a rolling direction, and the yield strength in a direction 45° from the rolling direction in a rolling plane is equal to or less than the average of the yield strength in the rolling direction and the yield strength in a direction 90° from the rolling direction in the rolling plane.. ... Jfe Steel Corporation

11/23/17 / #20170335422

Apparatus line for manufacturing seamless steel pipe and tube and method of 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 steel pipe having a predetermined shape. A cooling apparatus is arranged on an exit side of the rolling apparatus. ... 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 polar opposites by reduction rolls in the course from the completion of solidification to the completion of the recuperation of the cast product so that rolling reduction r which is a reduction ratio of a distance between middle points of the polar opposites is set to a value exceeding 0% and 5% or less.. . ... 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% or less, s: 0.005% or less, sol. Al: 0.01% or more and 0.07% or less, cr: 0.4% or more and 0.8% or less, cu: 0.1% or more and 0.5% or less, ni: 0.1% or more and 0.3% or less, mo: 0.1% or more and 0.2% or less, nb: 0.01% or more and 0.04% or less, ti: 0.005% or more and 0.03% or less, n: 0.005% or less, and the balance of fe and inevitable impurities; casting the molten steel into a steel material; subjecting the steel material to hot rolling; and coiling a resultant steel strip, wherein a finish rolling temperature is 820° c. ... Jfe Steel Corporation

11/16/17 / #20170327936

Metal strip stabilization apparatus and method for manufacturing hot-dip coated metal strip using same

A metal strip stabilization apparatus includes: a displacement measurement unit configured to measure a displacement of a metal strip during traveling in a non-contact manner; a control unit configured to generate a vibration suppression signal and a position correction signal based on a measurement signal; and an electromagnet unit including: a vibration suppression coil configured to generate a first magnetic force based on the vibration suppression signal; a position correction coil configured to generate a second magnetic force based on the position correction signal; and a core about which the vibration suppression coil and the position correction coil are wound concentrically, the core leading the first magnetic force. . ... Jfe Steel Corporation

11/16/17 / #20170327926

Method for manufacturing metal sheet and rapid quenching unit

A method for manufacturing a metal sheet comprising pinching the metal sheet in rapid quenching between a pair of pinch rolls in the range where the temperature of the metal sheet is from (tms+150) (° c.) to (tmf−150) (° c.), wherein the ms temperature of the metal sheet is tms (° c.) and the mf temperature thereof is tmf (° c.), as well as a rapid quenching unit comprising a pair of pinch rolls capable of use in such a method.. . ... Jfe Steel Corporation

11/16/17 / #20170327921

Ferritic stainless steel and process for producing same

Ferritic stainless steel that has excellent formability and ridging resistance and can be produced with high productivity is provided. The ferritic stainless steel has: a predetermined chemical composition; a microstructure containing ferrite crystal grains which satisfy at least one of a c concentration of 2cc or more and an n concentration of 2cn or more, the ferrite crystal grains having a volume fraction with respect to a whole volume of the microstructure of 5% or more and 50% or less, where cc and cn are respectively c content and n content in the steel in mass %; and a vickers hardness of 180 or less.. ... Jfe Steel Corporation

11/16/17 / #20170327919

High-strength steel sheet, high-strength hot-dip galvanized steel sheet, high-strength hot-dip aluminum-coated steel sheet, and high-strength electrogalvanized steel sheet, and methods for manufacturing same

A high-strength steel sheet with excellent formability and high yield ratio that has ts of 980 mpa or more and yr of 68% or more is obtained by providing a predetermined chemical composition and a steel microstructure that contains, in area ratio, 15 to 55% of polygonal ferrite, 8% or more of non-recrystallized ferrite, and 15 to 30% of martensite, and that contains, in volume fraction, 12% or more of retained austenite, in which the polygonal ferrite has a mean grain size of 4 μm or less, the martensite has a mean grain size of 2 μm or less, the retained austenite has a mean grain size of 2 μm or less, and a value obtained by dividing an mn content in the retained austenite (in mass %) by an mn content in the polygonal ferrite (in mass %) equals 2.0 or more.. . ... Jfe Steel Corporation

11/16/17 / #20170326627

Continuous steel casting method

Conditions for soft reduction are determined in a method of continuous casting in accordance with a method utilizing the thickness of a slab strand to prevent center segregation from occurring in the strand due to an insufficient pressing rate or internal cracks from occurring in the strand due to an excessively high pressing rate.. . ... Jfe Steel Corporation

11/09/17 / #20170321297

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

A high-strength cold-rolled steel sheet having a specified chemical composition and a microstructure including ferrite having an average crystal grain diameter of 2 μm or less in an amount of 10% to 25% in terms of volume fraction, retained austenite in an amount of 5% to 20% in terms of volume fraction, martensite having an average crystal grain diameter of 2 μm or less in an amount of 5% to 15% in terms of volume fraction, and the balance being a multi-phase structure including bainite and tempered martensite having an average crystal grain diameter of 5 μm or less, in which a relational expression, 0.35≦v2/v1≦0.75 (1), is satisfied, where v1 is a volume fraction of phases which are different from ferrite and v2 is a volume fraction of tempered martensite.. . ... Jfe Steel Corporation

11/09/17 / #20170321296

Method for manufacturing grain-oriented electrical steel sheet

Disclosed is a method for manufacturing a grain-oriented electrical steel sheet using an inhibitor-less technique, in which cold rolling includes final cold rolling with a total cold rolling reduction being set to 85% or more and a rolling reduction per pass being set to 32% or more. The final cold rolling includes one or more passes and a final pass succeeding the one or more passes and uses work rolls having a surface roughness ra of 0.25 μm or less in at least one of the one or more passes other than the final pass. ... Jfe Steel Corporation

10/26/17 / #20170306507

Cold-rolled steel sheet, method of manufacturing cold-rolled steel sheet, automobile member and facility for manufacturing cold-rolled steel sheet

. . A cold-rolled steel sheet has excellent chemical convertibility and excellent corrosion resistance after coating. A method of manufacturing a cold-rolled steel sheet includes first pickling applied to a steel sheet which is continuously annealed after cold rolling, second pickling applied to the steel sheet subsequently and, thereafter, neutralizing treatment applied to the steel sheet using an alkaline solution.. ... Jfe Steel Corporation

10/26/17 / #20170306437

High-strength hot-pressed part and method for manufacturing the same

A high-strength hot-pressed part having a specified chemical composition, a microstructure including, in terms of volume fraction, 80% or more of a martensite phase, in a range of 3.0% to 20.0% of a retained austenite phase, a tensile strength ts of 1500 mpa or more, and a uniform elongation uel of 6.0% or more. A method for manufacturing the high-strength hot-pressed part, the method comprising performing a heating process and a hot press forming process on a raw material steel sheet in order to obtain a hot-pressed part having a specified shape.. ... Jfe Steel Corporation

10/26/17 / #20170306436

Steel sheet for two-piece can and manufacturing method therefor

A steel sheet for two-piece cans is suitable not only for drawing and ironing, but also for forming beads or geometric shapes on a can body and can be preferably used to form a special-shaped two-piece can. The steel sheet for two-piece cans contains, in mass %, c: 0.020% to 0.080%, si: 0.04% or less, mn: 0.10% to 0.60%, p: 0.02% or less, s: 0.015% or less, al: 0.010% to 0.100%, and n: 0.0005% to 0.0030%, the balance being fe and unavoidable impurities. ... Jfe Steel Corporation

10/26/17 / #20170306435

High-strength steel sheet, high-strength hot-dip galvanized steel sheet, high-strength hot-dip aluminum-coated steel sheet, and high-strength electrogalvanized steel sheet, and methods for manufacturing same

A high-strength steel sheet with excellent formability and high yield ratio that has ts of 590 mpa or more and yr of 68% or more is obtained by providing a predetermined chemical composition and a steel microstructure that contains, in area ratio, 35 to 80% of polygonal ferrite, 5% or more of non-recrystallized ferrite, and 5 to 25% of martensite, and that contains, in volume fraction, 8% or more of retained austenite, in which the polygonal ferrite has a mean grain size of 6 μm or less, the martensite has a mean grain size of 3 μm or less, the retained austenite has a mean grain size of 3 μm or less, and a value obtained by dividing an mn content in the retained austenite (in mass %) by an mn content in the polygonal ferrite (in mass %) equals 2.0 or more.. . ... Jfe Steel Corporation

10/12/17 / #20170292176

Steel sheet for crown cap and method for producing the same

A steel sheet for a crown cap having sufficient strength and formability suitable for forming crown caps even when reduced in gauge, and a method for producing the steel sheet for a crown cap. The steel sheet for a crown cap having a composition that includes, in terms of % by mass: c: 0.002% or more and 0.010% or less, si: 0.05% or less, mn: 0.05% or more and 0.30% or less, p: 0.030% or less, s: 0.020% or less, al: less than 0.0100%, n: 0.0050% or less, and the balance being fe and unavoidable impurities. ... Jfe Steel Corporation

10/05/17 / #20170283923

Cold-rolled ferritic stainless steel sheet

Provided is a cold-rolled ferritic stainless steel sheet having a chemical composition that contains, by mass %, c: 0.01% or more and 0.05% or less, si: 0.02% or more and 0.75% or less, mn: 0.1% or more and 1.0% or less, p: 0.04% or less, s: 0.01% or less, al: 0.001% or more and 0.10% or less, n: 0.01% or more and 0.06% or less, cr: 16.0% or more and 18.0% or less, and the balance being fe and inevitable impurities. The metallographic structure includes a ferrite phase, in which the average grain diameter is 10 μm or less, in which the proportion of ferrite grains having a grain diameter of 10 μm or more and less than 40 μm is 60% or more, and in which the proportion of ferrite grains having a grain diameter of less than 5 μm is less than 20%.. ... Jfe Steel Corporation

10/05/17 / #20170283918

High-strength seamless steel pipe for oil country tubular goods and method of producing the same

Provided is a high-strength seamless steel pipe having the composition which contains, by mass %, 0.20 to 0.50% c, 0.05 to 0.40% si, 0.3 to 0.9% mn, 0.015% or less p, 0.005% or less s, 0.005 to 0.1% al, 0.008% or less n, more than 0.6% and 1.7% or less cr, more than 1.0% and 3.0% or less mo, 0.01 to 0.30% v, 0.001% or more and less than 0.01% nb, 0.0003 to 0.0030% b, and 0.0030% or less o (oxygen). The high-strength seamless steel pipe has the microstructure where a volume fraction of a tempered martensitic phase is 95% or more, and prior austenitic grains have a grain size number of 8.5 or more, and a segregation degree index ps which is defined by a formula ps=8.1 (xsi+xmn+xmo)+1.2xp is set to less than 65.. ... Jfe Steel Corporation

10/05/17 / #20170283900

High-strength hot-dip galvanized steel sheet and method for manufacturing the same (as amended)

A high-strength hot-dip galvanized steel sheet and a method for manufacturing the steel sheet are provided. The high-strength hot-dip galvanized steel sheet has a specific composition including c, si, mn, etc. ... Jfe Steel Corporation

10/05/17 / #20170283895

Rail manufacturing method and rail manufacturing apparatus

A method and an apparatus for manufacturing a rail having high ductility in both a head portion and a foot portion. A heated steel rail material is hot-rolled, the temperature is adjusted by cooling the hot-rolled steel rail material, the steel rail material subjected to the temperature adjustment is processed into a rail shape by means of temperature-adjusted rolling at an area reduction ratio of 20% or more, and, in adjusting the temperature of the steel rail material, the surface portions of the steel rail material corresponding to a head portion and a foot portion of the rail shape so that the temperatures of the surface portions reach 500° c. ... Jfe Steel Corporation

10/05/17 / #20170282206

Slurry application device and slurry application method

A slurry application device includes: a slurry supply unit configured to supply slurry to a surface of a traveling base material; a slurry application unit including a first roll body disposed at the downstream side in relation to the slurry supply unit and configured to press the first roll body against the slurry to apply the slurry onto the surface and to adjust an adhesion amount of the slurry such that a film thickness of the slurry becomes one time or more and two times or less of a target film thickness; and a slurry adhesion amount adjustment unit including a second roll body disposed at the downstream side in relation to the slurry application unit and configured to press the second roll body against the slurry to adjust the slurry adhesion amount such that the film thickness of the slurry becomes the target film thickness.. . ... Jfe Steel Corporation

09/28/17 / #20170275744

Material for cold-rolled stainless steel sheet

Provided is a material for a cold-rolled stainless steel sheet having a chemical composition containing, by mass %, c: 0.01% to 0.05%, si: 0.02% to 0.75%, mn: 0.1% to 1.0%, p: 0.04% or less, s: 0.01% or less, cr: 16.0% to 18.0%, al: 0.001% to 0.10%, n: 0.01% to 0.06% and the balance being fe and inevitable impurities. The material has a metallographic structure including a martensite phase having an area ratio of 5% to 50% and the balance being a ferrite phase. ... Jfe Steel Corporation

09/28/17 / #20170275731

Hearth roll and continuous annealing facility

Provided is a hearth roll for supporting and conveying a steel sheet in a continuous annealing furnace, wherein all of a shaft portion and a roil main body are made from one or more ceramic materials, preferably constituted with concentric ceramic layers of different ceramic materials centering on the rotation shaft of the roll. The hearth roll has not only an excellent pickup resistance but also a long roll life free from maintenance for long periods. ... Jfe Steel Corporation

09/28/17 / #20170275727

Thick steel plate having good multipass weld joint ctod characteristics and method for manufacturing the same

A steel plate comprising, by mass %: c: 0.03% to 0.12%, si: 0.5% or less, mn: 1.0% to 2.0%, p: 0.015% or less, s: 0.0005% to 0.0050%, al: 0.005% to 0.060%, ni: 0.5% to 2.0%, ti: 0.005% to 0.030%, n: 0.0015% to 0.0065%, 0: 0.0010% to 0.0050%, ca: 0.0005% to 0.0060%, and optionally one or two or more of cu and the like. Ti/n, ceq, pcm, and acr are in particular ranges, a base metal of the plate has an effective grain size of 20 μm or less at half the thickness of the plate, and the plate contains a particular number of complex inclusions at ¼ and ½ of the thickness of the plate. ... Jfe Steel Corporation

09/28/17 / #20170275726

High-strength galvanized steel sheet excellent in stretch-flange formability, in-plane stability of stretch-flange formability, and bendability and method for manufacturing the same

Provided are a high-strength galvanized steel sheet containing 0.12% to 0.25% c, 0.01% to 1.00% si, 1.5% to 4.0% mn, 0.100% or less p, 0.02% or less s, 0.01% to 0.10% al, 0.001% to 0.010% n, 0.005% to 0.100% ti, and 0.0005% to 0.0050% b, the remainder being fe and inevitable impurities, ti>4n being satisfied. The high-strength galvanized steel sheet contains 80% to 100% martensite in terms of area fraction, 5% or less (including 0%) polygonal ferrite in terms of area fraction, and less than 3% (including 0%) retained austenite in terms of area fraction. ... Jfe Steel Corporation

09/28/17 / #20170275725

Ferritic stainless steel foil and method for manufacturing the same (as amended)

Provided are a ferritic stainless steel foil excellent in terms of corrugating workability, shape change resistance at a high temperature, and manufacturability and a method for manufacturing the steel foil. A ferritic stainless steel foil having a chemical composition containing, by mass % , c: 0.020% or less, si: 2.0% or less, mn: 1.0% or less, s: 0.010% or less, p: 0.050% or less, cr: 10.0% or more and 25.0% or less, ni: 0.05% or more and 0.50% or less, ti: 0.14% or more and 0.25% or less, al: 0.001% or more and 0.10% or less, v: 0.02% or more and 0.10% or less, n: 0.020% or less, and the balance being fe and inevitable impurities, and a vickers hardness of higher than 200 and lower than 350.. ... Jfe Steel Corporation

09/28/17 / #20170275722

Ferritic stainless steel sheet

Provided is a ferritic stainless steel sheet having excellent corrosion resistance and workability equal to or better than suh409l. The ferritic stainless steel sheet contains 0.025% or less c, 0.01% to 1.00% si, 0.05% to 1.00% mn, 0.020% to 0.040% p, 0.030% or less s, 0.001% to 0.100% al, 12.5% to 14.4% cr, 0.01% to 0.80% ni, 0.11% to 0.40% ti, 0.010% to 0.100% nb, and 0.020% or less n by mass %, the remainder being fe and inevitable impurities.. ... Jfe Steel Corporation

09/28/17 / #20170275720

Method of manufacturing hot rolled steel sheet for square column for building structural members

A method of manufacturing a hot rolled steel sheet for a square column for building structural members includes a hot rolling step, a cooling step, and a coiling step performed on a steel to form a hot rolled steel sheet, wherein the steel has a composition containing, in terms of % by mass, c: 0.07 to 0.18%, mn: 0.3 to 1.5%, p: 0.03% or less, s: 0.015% or less, al: 0.01 to 0.06%, n: 0.0006% or less, and the balance being fe and unavoidable impurities.. . ... Jfe Steel Corporation

09/28/17 / #20170275715

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

Provided is a high-strength seamless steel pipe having the composition which contains, by mass %, 0.20 to 0.50% c, 0.05 to 0.40% si, 0.3 to 0.9% mn, 0.015% or less p, 0.005% or less s, 0.005 to 0.1% al, 0.008% or less n, 0.6 to 1.7% cr, 0.4 to 1.0% mo, 0.01 to 0.30% v, 0.01 to 0.06% nb, 0.0003 to 0.0030% b, and 0.0030% or less o (oxygen). The high-strength seamless steel pipe has the microstructure where a volume fraction of a tempered martensitic phase is 95% or more, and prior austenitic grains have a grain size number of 8.5 or more, and a segregation degree index ps which is defined by a formula ps=8.1 (xsi+xmn+xmo)+1.2xp relating to xm which is a ratio between a segregated portion content and an average content is set to less than 65.. ... Jfe Steel Corporation

09/28/17 / #20170274432

Non-oriented electrical steel sheet and manufacturing method thereof

A non-oriented electrical steel sheet with lower iron loss than conventional non-oriented electrical steel sheets is provided. The non-oriented electrical steel sheet has a chemical composition containing, in mass %: c: 0.05% or less; si: 0.1% or more and 7.0% or less; al: 0.1% or more and 3.0% or less; mn: 0.03% or more and 3.0% or less; p: 0.2% or less; s: 0.005% or less; n: 0.005% or less; and o: 0.01% or less, and further optionally containing a predetermined amount of one or more of sn, sb, ca, mg, rem, cr, ti, nb, v, and zr, with the balance consisting of fe and incidental impurities, wherein a sheet thickness is less than 0.30 mm, and arithmetic mean roughness ra of a steel substrate surface at cutoff wavelength λc=20 μm is 0.2 μm or less.. ... Jfe Steel Corporation

09/21/17 / #20170266924

Resin-coated metal sheet for can lids

A resin-coated metal sheet for can lids includes a metal sheet coated with thermoplastic resin films on both surfaces and formed into a can lid. A thermoplastic resin film a based on polybutylene terephthalate (pbt) and polyethylene terephthalate (pet) is heat-fused on a surface of the metal sheet serving as an exterior surface of the can lid, and a thermoplastic resin film b based on polyethylene terephthalate (pet) is heat-fused on a surface of the metal sheet serving as an interior surface of the can lid. ... Jfe Steel Corporation

09/21/17 / #20170266751

Ferritic stainless steel sheet for plasma arc welding and welding method therefor (as amended)

The ferritic stainless steel sheet contains, in mass %, c: 0.020% or less, si: 0.6% or less, mn: 0.5% or less, p: 0.04% or less, s: 0.010% or less, al: 0.015% or more and 0.20% or less, cr: 17.0% or more and 24.0% or less, ni: less than 0.6%, n: 0.020% or less, ca: 0.0002% or more and 0.0020% or less, and o: 0.0050% or less and further contains one or two selected from ti: 0.01% or more and 0.45% or less and nb: 0.01% or more and 0.55% or less, with the balance being fe and unavoidable impurities. The ferritic stainless steel sheet satisfies (ti+nb×48/93)/(c+n)≧8.0 (where ti, nb, c, and n represent the contents (% by mass) of these elements, respectively).. ... Jfe Steel Corporation

09/14/17 / #20170263357

Method of manufacturing grain-oriented electrical steel sheet

A method of manufacturing a grain oriented electrical steel sheet includes subjecting a steel slab to a rolling process including cold rolling to obtain a steel sheet with a final sheet thickness, the steel slab containing by mass % c: 0.01% to 0.20%, si: 2.0% to 5.0%, mn: 0.03% to 0.20%, sol. Al: 0.010% to 0.05%, n: 0.0010% to 0.020%, at least one element selected from s and se in a total of 0.005% to 0.040%, and the balance including fe and incidental impurities; forming, by a chemical process, a linear groove extending in a direction forming an angle of 45° or less with a direction orthogonal to a rolling direction of the steel sheet; subjecting the steel sheet to decarburization annealing; applying an annealing separator thereon mainly composed of mgo; and subjecting the steel sheet to final annealing to manufacture a grain oriented electrical steel sheet.. ... Jfe Steel Corporation

09/14/17 / #20170260600

Non-oriented electrical steel sheet and method for producing the same, and motor core and method of producing the same

A non-oriented electrical steel sheet is obtained by subjecting a slab containing c: not more than 0.005 mass %, si: 1.0-5.0 mass %, mn: 0.04-3.0 mass %, sol. Al: not more than 0.005 mass %, p: 0.03-0.2 mass %, s: not more than 0.005 mass %, n: not more than 0.005 mass %, b: not more than 0.001 mass %, and se: not more than 0.001 mass % and satisfying sol. ... Jfe Steel Corporation

09/14/17 / #20170259340

Alloy steel powder for powder metallurgy, and sintered body

An fe—mo—cu—c-based alloy steel 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, wherein an iron-based powder has a mean particle size of 30 μm to 120 μm, and a cu powder has a mean particle size of 25 μm or less. Despite the alloy steel powder for powder metallurgy having a chemical composition not containing ni, a part produced by sintering a press formed part of the powder and further carburizing-quenching-tempering the sintered part has mechanical properties of at least as high tensile strength, toughness, and sintered density as a ni-added part.. ... Jfe Steel Corporation

09/07/17 / #20170253943

Method and facility for producing high-strength galavanized steel sheets

A method for producing high-strength galvanized steel sheets having excellent coating adhesion, workability and appearance. The method comprises hot rolling a slab comprising, by mass %, c: 0.05 to 0.30%, si: 0.1 to 2.0% and mn: 1.0 to 4.0%, then coiling the steel sheet into a coil at a specific temperature tc, and pickling the steel sheet, cold rolling the hot-rolled steel sheet resulting from the hot rolling, annealing the cold-rolled steel sheet resulting from the cold rolling under specific conditions, and galvanizing the annealed sheet resulting from the annealing in a galvanizing bath containing 0.12 to 0.22 mass % al.. ... Jfe Steel Corporation

09/07/17 / #20170253940

Grain-oriented electrical steel sheet and process for producing same

Disclosed is a grain-oriented electrical steel sheet that exhibits excellent iron loss properties and a good building factor, in which damage to a tension coating is suppressed. In a grain-oriented electrical steel sheet having a tension coating, an interlaminar current is 0.15 a or less, a plurality of linear strain regions extending in a direction transverse to the rolling direction are formed, the strain regions are formed at line intervals in the rolling direction of 15 mm or less, each of the strain regions has closure domains formed therein, and each of the closure domains has a length d along the sheet thickness direction of 65 μm or more and a length w along the rolling direction of 250 μm or less.. ... Jfe Steel Corporation

08/31/17 / #20170247783

High-strength galvanized steel sheet

A high-strength galvanized steel sheet comprising a cold-rolled steel sheet, an intermetallic compound formed on the cold-rolled steel sheet, and a galvanizing layer formed on the intermetallic compound, the cold-rolled steel sheet having a specific composition and a microstructure having a martensite area ratio of 7% or more and less than 25% and a ferrite area ratio of 50% or more and which includes a base metal surface portion in which the amount of internal oxides per single side is 0.05 g/m2 or less.. . ... Jfe Steel Corporation

08/31/17 / #20170247773

Molten steel desulfurization method, molten steel secondary refining method, and molten steel manufacturing method

A method for desulfurizing molten steel comprising taking a sample out from molten steel after tapping from a converter or during secondary refining and analyzing the sample rapidly with high accuracy by a method comprising a high frequency induction heating step wherein the sample is combusted and oxidized under the high frequency induction heating in an oxygen atmosphere having an oxygen purity of 99.5 vol % or more to convert s in the sample into so2 and an analyzing step wherein so2-containing gas produced in the high frequency induction heating step is analyzed through an ultraviolet fluorescence method to quantify s concentration of the sample.. . ... Jfe Steel Corporation

08/31/17 / #20170247618

Method of thermal decomposition of organic substance (as amended)

Provided is a thermal decomposition method that allows efficient thermal decomposition of an organic substance such as a plastic to produce gas and oil with high heating value and with which a large amount of the organic substance can be processed. The method includes mixing the organic substance with an organic substance decomposition catalyst, forming the mixture to produce a composite agglomerated material, and thermally decomposing the organic substance by placing the composite agglomerated material in a thermal decomposition furnace. ... Jfe Steel Corporation

08/24/17 / #20170241002

Non-oriented electrical steel sheet having excellent magnetic properties

A non-oriented electrical steel sheet has excellent magnetic properties and a chemical composition including 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 % but preferably not more than 0.005 mass %, n: not more than 0.005 mass %, s: not more than 0.01 mass %, ga: not more than 0.0005 mass % even if hot band annealing is omitted.. . ... Jfe Steel Corporation








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