Patents by Inventor Atsutaka Hayashi
Atsutaka Hayashi 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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Patent number: 11891681Abstract: The present invention has as its technical problem to prevent cracking when producing a steel sheet by ferritic stainless steel sheet and provide a ferritic stainless steel sheet excellent in toughness and a part using the same. To solve this technical problem, the present invention provides steel comprised of, by mass %, C: 0.001 to 0.030%, Si: 0.01 to 1.00%, Mn: 0.01 to 1.00%, P: 0.010 to 0.050%, S: 0.0002 to 0.0100%, Cr: 10.0 to 20.0%, N: 0.001 to 0.030%, Nb: 0.10 to 0.40%, B: 0.0002 to 0.0030%, Al: 0.005 to 0.100%, and a balance of Fe and unavoidable impurities in which the amount of solute Nb being less than or equal to a smaller value of 0.20 and (Nb content-0.08) mass %.Type: GrantFiled: February 17, 2022Date of Patent: February 6, 2024Assignee: NIPPON STEEL STAINLESS STEEL CORPORATIONInventors: Junichi Hamada, Atsutaka Hayashi
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Publication number: 20220275492Abstract: The present invention has as its technical problem to prevent cracking when producing a steel sheet by ferritic stainless steel sheet and provide a ferritic stainless steel sheet excellent in toughness and a part using the same. To solve this technical problem, the present invention provides steel comprised of, by mass %, C: 0.001 to 0.030%, Si: 0.01 to 1.00%, Mn: 0.01 to 1.00%, P: 0.010 to 0.050%, S: 0.0002 to 0.0100%, Cr: 10.0 to 20.0%, N: 0.001 to 0.030%, Nb: 0.10 to 0.40%, B: 0.0002 to 0.0030%, Al: 0.005 to 0.100%, and a balance of Fe and unavoidable impurities in which the amount of solute Nb being less than or equal to a smaller value of 0.20 and (Nb content-0.08) mass %.Type: ApplicationFiled: February 17, 2022Publication date: September 1, 2022Applicant: NIPPON STEEL Stainless Steel CorporationInventors: Junichi Hamada, Atsutaka Hayashi
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Patent number: 11286547Abstract: This ferritic stainless steel includes: in terms of % by mass, C: 0.001% to 0.100%; Si: 0.01% to 5.00%; Mn: 0.01% to 2.00%; P: 0.050% or less; S: 0.0100% or less; Cr: 9.0% to 25.0%; Ti: 0.001% to 1.00%; Al: 0.001% to 5.000%; and N: 0.001% to 0.050%, with a balance being Fe and impurities, wherein in a region from a steel surface to a depth of 5 nm, and not exceeding a thickness of a passive film, a total amount of Al and Si is 1.0 atomic % or more, an amount of Cr is 10.0 atomic % or more, and an amount of Fe is 85.0 atomic % or less, in terms of cation fraction.Type: GrantFiled: March 19, 2019Date of Patent: March 29, 2022Assignee: NIPPON STEEL STAINLESS STEEL CORPORATIONInventors: Masatoshi Abe, Junichi Hamada, Nobuhiko Hiraide, Atsutaka Hayashi
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Patent number: 11242578Abstract: This ferritic stainless steel sheet contains, by mass %: C: 0.001% to 0.020%; Si: 0.01% to 4.00%; Mn: 0.01% to 3.00%; P: 0.010% to 0.040%; S: 0.0001% to 0.0100%; Cr: 10.0% to 15.0%; N: 0.001% to 0.020%; Al: 0.50% to 10.0%; and either one or both of Ti: 0.05% to 0.40% and Nb: 0.05% to 0.40%, with the balance being Fe and unavoidable impurities, in which Cr/(Si+Al) is 10.0 or less, and a specific gravity is 7.6 g/cm3 or less.Type: GrantFiled: March 27, 2018Date of Patent: February 8, 2022Assignee: NIPPON STEEL STAINLESS STEEL CORPORATIONInventors: Junichi Hamada, Masatoshi Abe, Atsutaka Hayashi
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Publication number: 20210040590Abstract: This ferritic stainless steel includes: in terms of % by mass, C: 0.001% to 0.100%; Si: 0.01% to 5.00%; Mn: 0.01% to 2.00%; P: 0.050% or less; S: 0.0100% or less; Cr: 9.0% to 25.0%; Ti: 0.001% to 1.00%; Al: 0.001% to 5.000%; and N: 0.001% to 0.050%, with a balance being Fe and impurities, wherein in a region from a steel surface to a depth of 5 nm, and not exceeding a thickness of a passive film, a total amount of Al and Si is 1.0 atomic % or more, an amount of Cr is 10.0 atomic % or more, and an amount of Fe is 85.0 atomic % or less, in terms of cation fraction.Type: ApplicationFiled: March 19, 2019Publication date: February 11, 2021Applicant: NIPPON STEEL Stainless Steel CorporationInventors: Masatoshi ABE, Junichi HAMADA, Nobuhiko HIRAIDE, Atsutaka HAYASHI
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Patent number: 10793930Abstract: A steel material contains, in mass %, C: 0.005 to 0.050, N: 0.05 to 0.30, Si: 0.1 to 1.5, Mn: 0.1 to 7.0, P: 0.005 to 0.100, S: 0.0001 to 0.0200, Cr: 18.0 to 28.0, Cu: 0.1 to 3.0, Ni: 0.1 to 8.0, Mo: 0.1 to 5.0, Al: 0.001 to 0.050, B: 0.0001 to 0.0200, and Ca: 0.0001 to 0.0100. An area ratio of an austenitic phase ranges from 30% to 70% and formulae (I) and (II) below are satisfied. 1.03?[% Cr*F]/[% Cr]?1.40??Formula (I) 1.05?[% Mn*A]/[% Mn]?1.Type: GrantFiled: February 14, 2017Date of Patent: October 6, 2020Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATIONInventors: Atsutaka Hayashi, Nobuhiko Hiraide, Junichi Hamada
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Patent number: 10752973Abstract: This ferritic stainless steel contains, by mass %, C: 0.001% to 0.030%; Si: 0.01% to 1.00%. Mn: 0.01% to 2.00%, P: 0.050% or less, S: 0.0100% or less, Cr: 11.0% to 30.0%, Mo: 0.01% to 3.00%, Ti: 0.001% to 0.050%, Al: 0.001% to 0.030%, Nb: 0.010% to 1.000%, and N: 0.050% or less, with a remainder being Fe and inevitable impurities, wherein an amount of Al, an amount of Ti, and an amount of Si (mass %) satisfy Al/Ti?8.4Si-0.78.Type: GrantFiled: March 28, 2019Date of Patent: August 25, 2020Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATIONInventors: Masatoshi Abe, Junichi Hamada, Nobuhiko Hiraide, Norihiro Kanno, Shigeo Fukumoto, Shigeru Kaneko, Atsutaka Hayashi
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Patent number: 10669606Abstract: A stainless steel exhibiting an excellent brazeability includes in mass %: C: from 0.001% to 0.1%; Si: from more than 1.5% to 4.0%; Mn: from 0.05% to 4.0%; Cr: from 10.5% to 30%; Ni: 35% or less; N: from 0.001% to 0.4%; one or both of Ti: 0.002% to 0.030% and Al: 0.002% to 0.10%; and a balance being Fe and inevitable impurities, in which an Si content, a Ti content and an Al content satisfy Formula 1, and an oxide film with a composition satisfying Formula 2 is formed on a surface of the stainless steel, Sim/(Tim+Alm)?40??Formula 1 1.2×SimFem?Sif/Fef?5×Sim/Fem??Formula 2 in Formula 1 and Formula 2, a suffix “f” expresses the oxide film in a unit of atom %, and a suffix “m” expresses a base material in a unit of mass %.Type: GrantFiled: March 22, 2016Date of Patent: June 2, 2020Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATIONInventors: Nobuhiko Hiraide, Atsutaka Hayashi
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Patent number: 10544490Abstract: A ferritic stainless steel for a fuel cell includes, in mass %, Cr: 11 to 25%, C: 0.03% or less, Si: 2% or less, Mn: 2% or less, Al: 0.5 to 4.0%, P: 0.05% or less, S: 0.01% or less, N: 0.03% or less, Ti: 1% or less, and a balance composed of Fe and unavoidable impurities. Furthermore, in the ferritic stainless steel, the maximal concentration of Al in a surface of the ferritic stainless steel is 30 mass % or more in cation ion fraction excepting O in an depth direction region having twice a thickness of an oxide film having less than 0.1 ?m.Type: GrantFiled: July 29, 2015Date of Patent: January 28, 2020Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATIONInventors: Masaharu Hatano, Atsutaka Hayashi, Kazuhisa Matsumoto
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Publication number: 20200024682Abstract: This ferritic stainless steel sheet contains, by mass %: C: 0.001% to 0.020%; Si: 0.01% to 4.00%; Mn: 0.01% to 3.00%; P: 0.010% to 0.040%; S: 0.0001% to 0.0100%; Cr: 10.0% to 15.0%; N: 0.001% to 0.020%; Al: 0.50% to 10.0%; and either one or both of Ti: 0.05% to 0.40% and Nb: 0.05% to 0.40%, with the balance being Fe and unavoidable impurities, in which Cr/(Si+Al) is 10.0 or less, and a specific gravity is 7.6 g/cm3 or less.Type: ApplicationFiled: March 27, 2018Publication date: January 23, 2020Applicant: NIPPON STEEL Stainless Steel CorporationInventors: Junichi HAMADA, Masatoshi ABE, Atsutaka HAYASHI
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Publication number: 20190300980Abstract: A steel material contains, in mass %, C: 0.005 to 0.050, N: 0.05 to 0.30, Si: 0.1 to 1.5, Mn: 0.1 to 7.0, P: 0.005 to 0.100, S: 0.0001 to 0.0200, Cr: 18.0 to 28.0, Cu: 0.1 to 3.0, Ni: 0.1 to 8.0, Mo: 0.1 to 5.0, Al: 0.001 to 0.050, B: 0.0001 to 0.0200, and Ca: 0.0001 to 0.0100. An area ratio of an austenitic phase ranges from 30% to 70% and formulae (I) and (II) below are satisfied. 1.03?[% Cr*F]/[% Cr]?1.40??Formula (I) 1.05?[% Mn*A]/[% Mn]?1.Type: ApplicationFiled: February 14, 2017Publication date: October 3, 2019Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATIONInventors: Atsutaka HAYASHI, Nobuhiko HIRAIDE, Junichi HAMADA
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Publication number: 20190226047Abstract: This ferritic stainless steel contains, by mass %, C: 0.001% to 0.030%; Si: 0.01% to 1.00%. Mn: 0.01% to 2.00%, P: 0.050% or less, S: 0.0100% or less, Cr: 11.0% to 30.0%, Mo: 0.01% to 3.00%, Ti: 0.001% to 0.050%, Al: 0.001% to 0.030%, Nb: 0.010% to 1.000%, and N: 0.050% or less, with a remainder being Fe and inevitable impurities, wherein an amount of Al, an amount of Ti, and an amount of Si (mass %) satisfy Al/Ti?8.4Si-0.78.Type: ApplicationFiled: March 28, 2019Publication date: July 25, 2019Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATIONInventors: Masatoshi ABE, Junichi HAMADA, Nobuhiko HIRAIDE, Norihiro KANNO, Shigeo FUKUMOTO, Shigeru KANEKO, Atsutaka HAYASHI
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Patent number: 10030282Abstract: This ferritic stainless steel sheet contains, by mass %: C: 0.02% or less, N: 0.02% or less, Si: 0.05% to 0.80%, Mn: 0.05% to 1.00%, P: 0.04% or less, S: 0.01% or less, Cr: 12% to 20%, Cu: 0.80% to 1.50%; Ni: 1.0% or less, Mo: 0.01% to 2.00%, Nb: 0.30% to 1.00%, Ti: 0.01% to less than 0.25%, Al: 0.003% to 0.46%, V: 0.01% to less than 0.15%, and B: 0.0002% to 0.0050%, with a remainder of Fe and inevitable impurities, wherein the following formulae (1) and (2) are satisfied, and an average Cu concentration in an area from a surface to a depth of 200 nm is 3.00% or less, in the case of Mn<0.65%, 1.44×Si?Mn?0.05?0??(1), and in the case of Mn?0.65%, 1.10×Si+Mn?1.19?0??(2).Type: GrantFiled: February 15, 2013Date of Patent: July 24, 2018Assignee: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATIONInventors: Atsutaka Hayashi, Yoshiharu Inoue, Nobuhiko Hiraide
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Publication number: 20180037968Abstract: A stainless steel exhibiting an excellent brazeability includes in mass %: C: from 0.001% to 0.1%; Si: from more than 1.5% to 4.0%; Mn: from 0.05% to 4.0%; Cr: from 10.5% to 30%; Ni: 35% or less; N: from 0.001% to 0.4%; one or both of Ti: 0.002% to 0.030% and Al: 0.002% to 0.10%; and a balance being Fe and inevitable impurities, in which an Si content, a Ti content and an Al content satisfy Formula 1, and an oxide film with a composition satisfying Formula 2 is formed on a surface of the stainless steel, Sim/(Tim+Alm)?40??Formula 1 1.2×SimFem?Sif/Fef?5×Sim/Fem??Formula 2 in Formula 1 and Formula 2, a suffix “f” expresses the oxide film in a unit of atom %, and a suffix “m” expresses a base material in a unit of mass %.Type: ApplicationFiled: March 22, 2016Publication date: February 8, 2018Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATIONInventors: Nobuhiko HIRAIDE, Atsutaka HAYASHI
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Publication number: 20170321310Abstract: A ferritic stainless steel for a fuel cell includes, in mass %, Cr: 11 to 25%, C: 0.03% or less, Si: 2% or less, Mn: 2% or less, Al: 0.5 to 4.0%, P: 0.05% or less, S: 0.01% or less, N: 0.03% or less, Ti: 1% or less, and a balance composed of Fe and unavoidable impurities. Furthermore, in the ferritic stainless steel, the maximal concentration of Al in a surface of the ferritic stainless steel is 30 mass % or more in cation ion fraction excepting 0 in an depth direction region having twice a thickness of an oxide film having less than 0.1 ?m.Type: ApplicationFiled: July 29, 2015Publication date: November 9, 2017Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATIONInventors: Masaharu HATANO, Atsutaka HAYASHI, Kazuhisa MATSUMOTO
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Publication number: 20170275723Abstract: This ferritic stainless steel contains, by mass %, C: 0.001% to 0.030%; Si: 0.01% to 1.00%, Mn: 0.01% to 2.00%, P: 0.050% or less, S: 0.0100% or less, Cr: 11.0% to 30.0%, Mo: 0.01% to 3.00%, Ti: 0.001% to 0.050%, Al: 0.001% to 0.030%, Nb: 0.010% to 1.000%, and N: 0.050% or less, with a remainder being Fe and inevitable impurities, wherein an amount of Al, an amount of Ti, and an amount of Si (mass %) satisfy Al/Ti?8.4Si?0.78.Type: ApplicationFiled: October 30, 2015Publication date: September 28, 2017Applicant: NIPPON STEEL & SUMIKIN STAINLESS STEEL CORPORATIONInventors: Masatoshi ABE, Junichi HAMADA, Nobuhiko HIRAIDE, Norihiro KANNO, Shigeo FUKUMOTO, Shigeru KANEKO, Atsutaka HAYASHI
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Publication number: 20140373980Abstract: This ferritic stainless steel sheet contains, by mass %: C: 0.02% or less, N: 0.02% or less, Si: 0.05% to 0.80%, Mn: 0.05% to 1.00%, P: 0.04% or less, S: 0.01% or less, Cr: 12% to 20%, Cu: 0.80% to 1.50%; Ni: 1.0% or less, Mo: 0.01% to 2.00%, Nb: 0.30% to 1.00%, Ti: 0.01% to less than 0.25%, Al: 0.003% to 0.46%, V: 0.01% to less than 0.15%, and B: 0.0002% to 0.0050%, with a remainder of Fe and inevitable impurities, wherein the following formulae (1) and (2) are satisfied, and an average Cu concentration in an area from a surface to a depth of 200 nm is 3.00% or less, in the case of Mn<0.65%, 1.44×Si—Mn?0.05?0??(1), and in the case of Mn?0.65%, 1.10×Si+Mn?1.19?0??(2).Type: ApplicationFiled: February 15, 2013Publication date: December 25, 2014Inventors: Atsutaka Hayashi, Yoshiharu Inoue, Nobuhiko Hiraide