Patents by Inventor Masataka Yoshino
Masataka Yoshino has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20240072266Abstract: Disclosed is a component for solid oxide fuel cells that is excellent in both electrical conductivity and chromium poisoning resistance. As a substrate, a ferritic stainless steel having a chemical composition containing, in mass %, Cr: 14.0% to 32.0% and Al: 2.50% to 7.00% is used. Precious metal particles are coated on a surface of the substrate. The precious metal particles have: an average particle size of 1 ?m or more and 10 ?m or less; a coating thickness of 0.5 ?m or more and 10 ?m or less; and a surface coverage of 1.0% or more.Type: ApplicationFiled: August 31, 2022Publication date: February 29, 2024Applicants: JFE STEEL CORPORATION, TreadStone Technologies, Inc.Inventors: Muhammad FEBRY, Takayoshi YANO, Tetsuyuki NAKAMURA, Akito MIZUTANI, Masataka YOSHINO, Reiko SUGIHARA, Conghua WANG
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Publication number: 20230212705Abstract: Provided is a stainless steel sheet having a predetermined chemical composition, in which a total volume fraction of Cr-based carbides with a grain size of 2.0 ?m or more is 10% or less.Type: ApplicationFiled: April 7, 2021Publication date: July 6, 2023Applicant: JFE STEEL CORPORATIONInventors: Masataka YOSHINO, Shino HIROTA, Takuya MATSUMOTO, Ayako TA
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Publication number: 20230119504Abstract: Having a chemical composition (1) containing 0.15 mass % to 1.00 mass % of Nb, and (2) containing 0.0005 mass % to 0.0100 mass % of Mg, where (3) the Al content is controlled in a range of 0.55 mass % to 2.00 mass %, and (4) a relationship of 0.0004?[Mg]/[Al]?0.0050 is further satisfied.Type: ApplicationFiled: February 19, 2021Publication date: April 20, 2023Applicant: JFE STEEL CORPORATIONInventors: Muhammad FEBRY, Tetsuyuki NAKAMURA, Takayoshi YANO, Masataka YOSHINO, Reiko SUGIHARA
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Patent number: 11401573Abstract: A ferritic stainless steel sheet having excellent corrosion resistance, formability, and ridging resistance and a method for manufacturing the same are provided. A ferritic stainless steel sheet has a chemical composition containing, in terms of mass %, C: 0.005 to 0.030%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.040% or less, S: 0.030% or less, Al: 0.001 to 0.150%, Cr: 10.8 to 14.4%, Ni: 0.01 to 2.50%, and N: 0.005 to 0.060%, with the balance being Fe and incidental impurities. The elongation after fracture is 28% or more, and the ridging height of a surface of a steel sheet to which a tensile strain of 23% has been applied in a rolling direction is 3.0 ?m or less.Type: GrantFiled: April 13, 2018Date of Patent: August 2, 2022Assignee: JFE STEEL CORPORATIONInventors: Shuji Nishida, Tomohiro Ishii, Masataka Yoshino, Mitsuyuki Fujisawa
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Publication number: 20220170129Abstract: There is provided a ferritic stainless steel sheet having excellent corrosion resistance and excellent hydrogen embrittlement resistance without requiring dehydrogenation treatment during its manufacture or incorporating large amounts of Ni, Cu, or Mn. The ferritic stainless steel sheet has a chemical composition containing, by mass percent, C: 0.001% to 0.020%, Si: 0.10% to 0.60%, Mn: 0.10% to 0.60%, P: 0.040% or less, S: 0.030% or less, Al: 0.030% to 0.060%, Cr: 16.5% to 19.0%, Ti: 0.15% to 0.35% Nb: 0.30% to 0.60%, Ni: 0.01% to 0.60%, O (oxygen): 0.0025% to 0.0050%, and N: 0.001% to 0.020%, the balance being Fe and incidental impurities, in which the number of precipitates having a cross-sectional area of 5.0 ?m2 or more is 300 or less in a 1-mm2 region, and the precipitates having a cross-sectional area of 5.0 ?m2 or more has an average cross-sectional area of 20.0 ?m2 or less.Type: ApplicationFiled: March 26, 2019Publication date: June 2, 2022Applicant: JFE STEEL CORPORATIONInventors: Shuji NISHIDA, Masataka YOSHINO, Fagang GAO, Hiroshi YAMAGUCHI
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Publication number: 20220017984Abstract: A ferritic stainless steel sheet has a predetermined chemical composition and thickness, and has an area ratio of crystal grains of 45 ?m or more in grain size of 20% or less.Type: ApplicationFiled: November 27, 2019Publication date: January 20, 2022Applicant: JFE STEEL CORPORATIONInventors: Keishi INOUE, Hidetaka KAWABE, Masataka YOSHINO, Mitsuyuki FUJISAWA
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Publication number: 20210363604Abstract: To provide a hot-rolled and annealed ferritic stainless steel sheet having sufficient corrosion resistance and excellent punching workability, a predetermined dimensional accuracy being obtained without cracking when the steel sheet is formed into a thick-walled flange by punching work, and a method for producing the hot-rolled and annealed ferritic stainless steel sheet. The hot-rolled and annealed ferritic stainless steel sheet has a chemical composition containing, on a mass percent basis, C: 0.001% to 0.020%, Si: 0.05% to 1.00%, Mn: 0.05% to 1.00%, P: 0.04% or less, S: 0.01% or less, Al: 0.01% to 0.10%, Cr: 10.0% to 20.0%, Ni: 0.50% to 2.00%, Ti: 0.10% to 0.40%, and N: 0.001% to 0.020%, the balance being Fe and incidental impurities; and has a metal microstructure which is a single ferrite phase microstructure having an average grain size of 5 to 20 ?m.Type: ApplicationFiled: September 25, 2019Publication date: November 25, 2021Applicant: JFE Steel CorporationInventors: Masataka Yoshino, Keishi Inoue, Fagang Gao
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Patent number: 10968499Abstract: 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.Type: GrantFiled: July 2, 2015Date of Patent: April 6, 2021Assignee: JFE STEEL CORPORATIONInventors: Akito Mizutani, Masataka Yoshino, Mitsuyuki Fujisawa, Ayako Ta
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Publication number: 20200385834Abstract: A raw material for a steel sheet, the raw material being suitable for manufacturing a cold-rolled ferritic stainless steel sheet having excellent corrosion resistance, formability, and ridging resistance, and a manufacturing method therefor are provided. A raw material for a cold-rolled stainless steel sheet has a chemical composition containing, in terms of mass %, C: 0.005 to 0.030%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.040% or less, S: 0.030% or less, Al: 0.001 to 0.150%, Cr: 10.8 to 14.4%, Ni: 0.01 to 2.50%, and N: 0.005 to 0.060%, with the balance being Fe and incidental impurities, in which the raw material has a structure containing 10 to 90% of a martensite phase in terms of area ratio with the balance being a ferrite phase.Type: ApplicationFiled: April 13, 2018Publication date: December 10, 2020Applicant: JFE Steel CorporationInventors: Shuji Nishida, Tomohiro Ishii, Masataka Yoshino, Mitsuyuki Fujisawa
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Publication number: 20200385835Abstract: The present invention provides a hot-rolled and annealed ferritic stainless steel sheet which has sufficient corrosion resistance and in which cracks can be prevented during blanking into a thick flange, and a method for manufacturing the same. A hot-rolled and annealed ferritic stainless steel sheet has a chemical composition containing, in percent by mass, C: 0.001% to 0.020%, Si: 0.05% to 1.00%, Mn: 0.05% to 1.00%, P: 0.04% or less, S: 0.01% or less, Al: 0.001% to 0.100%, Cr: 10.0% to 19.0%, Ni: 0.65% to 1.50%, Ti: 0.10% to 0.40%, and N: 0.001% to 0.020%, with the balance being Fe and unavoidable impurities, and has a threshold stress intensity factor KIC of 35 MPa·m1/2 or more.Type: ApplicationFiled: April 24, 2018Publication date: December 10, 2020Applicant: JFE Steel CorporationInventors: Masataka Yoshino, Keishi Inoue, Mitsuyuki Fujisawa
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Publication number: 20200347475Abstract: The present invention provides a ferritic stainless steel sheet and a method for manufacturing the same. A ferritic stainless steel sheet has a composition containing C: 0.001 to 0.020%, Si: 0.05 to 0.35%, Mn: 0.05 to 1.00%, P: 0.04% or less, S: 0.01% or less, Al: 0.001 to 0.300%, Cr: 10.0 to 13.0%, Ni: 0.75 to 1.50%, Ti: 0.05 to 0.35%, and N: 0.001 to 0.020%, with the balance being Fe and inevitable impurities, in which ?I [AD] represented by formula (1) below is 65% or more, and a metal structure has an average crystal grain size of 45 ?m or less: ?I [%]=24Ni+12Mn+6Cu?18Si?12Cr?12Mo+188 (1), where Ni, Mn, Cu, Si, Cr, and Mo represent contents of the respective elements (percent by mass), and an element not contained represents 0.Type: ApplicationFiled: October 16, 2018Publication date: November 5, 2020Applicant: JFE Steel CorporationInventors: Keishi Inoue, Hidetaka Kawabe, Masataka Yoshino, Mitsuyuki Fujisawa
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Patent number: 10801084Abstract: Provided are a material for cold rolled stainless steel sheets having sufficient corrosion resistance, excellent surface quality, excellent formability, and excellent ridging resistance; a method for manufacturing the same; and a cold rolled steel sheet. A material for cold rolled stainless steel sheets according to the present invention contains C: 0.005% to 0.025%, Si: 0.02% to 0.50%, Mn: 0.55% to 1.0%, P: 0.040% or less, S: 0.01% 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 0.025% on a mass basis, the remainder being Fe and inevitable impurities, and has a metallographic structure containing 5% to 20% of a martensite phase in terms of volume fraction, the remainder being a ferrite phase.Type: GrantFiled: July 2, 2015Date of Patent: October 13, 2020Assignee: JFE Steel CorporationInventors: Akito Mizutani, Masataka Yoshino, Mitsuyuki Fujisawa, Chikara Kami
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Publication number: 20200299800Abstract: A ferritic stainless steel sheet having excellent corrosion resistance, formability, and ridging resistance and a method for manufacturing the same are provided. A ferritic stainless steel sheet has a chemical composition containing, in terms of mass %, C: 0.005 to 0.030%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.040% or less, S: 0.030% or less, Al: 0.001 to 0.150%, Cr: 10.8 to 14.4%, Ni: 0.01 to 2.50%, and N: 0.005 to 0.060%, with the balance being Fe and incidental impurities. The elongation after fracture is 28% or more, and the ridging height of a surface of a steel sheet to which a tensile strain of 23% has been applied in a rolling direction is 3.0 ?m or less.Type: ApplicationFiled: April 13, 2018Publication date: September 24, 2020Applicant: JFE STEEL CORPORATIONInventors: Shuji NISHIDA, Tomohiro ISHII, Masataka YOSHINO, Mitsuyuki FUJISAWA
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Patent number: 10633730Abstract: 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. A ferrite phase in portions extending from surface layers of front and back surfaces of a steel sheet has an average grain diameter of 20 ?m or more and 50 ?m or less, and a ferrite phase in a central portion of the sheet includes an unrecrystallized ferrite phase.Type: GrantFiled: July 2, 2015Date of Patent: April 28, 2020Assignee: JFE Steel CorporationInventors: Ayako Ta, Yukihiro Matsubara, Yukio Kimura, Masataka Yoshino, Keisuke Nakazono, Sumio Kaiho, Saiichi Murata, Nobukazu Kitagawa
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Patent number: 10626486Abstract: 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.Type: GrantFiled: July 2, 2015Date of Patent: April 21, 2020Assignee: JFE STEEL CORPORATIONInventors: Akito Mizutani, Masataka Yoshino, Mitsuyuki Fujisawa, Ayako Ta
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Patent number: 10550454Abstract: 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 ?m or less, in which the proportion of ferrite grains having a grain diameter of 10 ?m or more and less than 40 ?m is 60% or more, and in which the proportion of ferrite grains having a grain diameter of less than 5 ?m is less than 20%.Type: GrantFiled: July 2, 2015Date of Patent: February 4, 2020Assignee: JFE Steel CorporationInventors: Ayako Ta, Yukihiro Matsubara, Yukio Kimura, Keisuke Nakazono, Masataka Yoshino
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Publication number: 20200002779Abstract: Provided is a hot-rolled ferritic stainless steel sheet which has sufficient corrosion resistance and which can prevent the occurrence of cracking when subjected to blanking to be formed into a thick flange, and also provided is a method for manufacturing the hot-rolled ferritic stainless steel sheet. A hot-rolled ferritic stainless steel sheet having a chemical composition containing, in mass %, C: 0.001 to 0.020%, Si: 0.05 to 1.00%, Mn: 0.05 to 1.00%, P: 0.04% or less, S: 0.01% or less, Al: 0.001 to 0.50%, N: 0.001 to 0.020%, Cr: 11.0 to 24.0%, Ni: 0.01 to 2.00%, and Nb: 0.12 to 0.80%, with the balance being Fe and incidental impurities, wherein the hot-rolled ferritic stainless steel sheet has a threshold stress intensity factor KIC of 25 MPa·m1/2 or more.Type: ApplicationFiled: January 12, 2018Publication date: January 2, 2020Applicant: JFE Steel CorporationInventors: Masataka YOSHINO, Mitsuyuki FUJISAWA
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Publication number: 20190226045Abstract: A hot-rolled and annealed ferritic stainless steel sheet which has sufficient corrosion resistance and with which it is possible to inhibit a crack from occurring when punching work is performed to form a thick-walled flange and a method for manufacturing the steel sheet. The hot-rolled and annealed ferritic stainless steel sheet has a chemical composition comprising, by mass %, C: 0.001% to 0.020%, Si: 0.05% to 1.00%, Mn: 0.05% to 1.00%, P: 0.04% or less, S: 0.01% or less, Al: 0.001% to 0.100%, Cr: 10.0% to 24.0%, Ni: 0.01% to 0.60%, Ti: 0.10% to 0.40%, N: 0.001% to 0.020%, and the balance being Fe and inevitable impurities, and a threshold stress intensity factor KIC of 20 MPa·m1/2 or more.Type: ApplicationFiled: September 27, 2017Publication date: July 25, 2019Applicant: JFE STEEL CORPORATIONInventors: Masataka YOSHINO, Mitsuyuki FUJISAWA
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Publication number: 20180363083Abstract: Provided are a material for cold rolled stainless steel sheets having sufficient corrosion resistance, excellent surface quality, excellent formability, and excellent ridging resistance; a method for manufacturing the same; and a cold rolled steel sheet. A material for cold rolled stainless steel sheets according to the present invention contains C: 0.005% to 0.025%, Si: 0.02% to 0.50%, Mn: 0.55% to 1.0%, P: 0.040% or less, S: 0.01% 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 0.025% on a mass basis, the remainder being Fe and inevitable impurities, and has a metallographic structure containing 5% to 20% of a martensite phase in terms of volume fraction, the remainder being a ferrite phase.Type: ApplicationFiled: July 2, 2015Publication date: December 20, 2018Applicant: JFE STEEL CORPORATIONInventors: Akito Mizutani, Masataka Yoshino, Misuyuki Fujisawa, Chikara Kami
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Publication number: 20180265951Abstract: A ferritic stainless steel having sufficient corrosion resistance and excellent formability and ridging resistance. The ferritic stainless steel having a chemical composition comprising, by mass %, C: 0.005% or more and 0.035% or less, Si: 0.25% or more and less than 0.40%, Mn: 0.05% or more and 0.35% or less, P: 0.040% or less, S: 0.01% or less, Cr: 15.5% or more and 18.0% or less, Al: 0.001% or more and 0.10% or less, N: 0.01% or more and 0.06% or less, and the balance being Fe and inevitable impurities. Si and Mn satisfy the relational expression 29.5×Si?50×Mn+6?0, where Si and Mn in the relational expression respectively denote the content, by mass %, of the corresponding chemical element.Type: ApplicationFiled: October 2, 2014Publication date: September 20, 2018Applicant: JFE STEEL CORPORATIONInventors: Masataka YOSHINO, Akito MIZUTANI, Mitsuyuki FUJISAWA, Ayako TA