Patents by Inventor Yoshitomo Fujimura
Yoshitomo Fujimura 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: 20230383390Abstract: This ferritic stainless steel has a predetermined chemical composition, at least one type of oxides of oxides containing 5 mass % or more of Al and oxides containing 5 mass % or more of Si are present on the surface, and, among the oxides present on the surface, the number of oxides having a diameter D of 0.1 ?m or more and 2.0 ?m or less is 10 or more per 93 ?m2, the diameter D being represented by D=(Dmax+Dmin)/2 where Dmax is the maximum diameter of the oxide on the surface and Dmin is the minimum diameter of the oxide on the surface.Type: ApplicationFiled: October 22, 2021Publication date: November 30, 2023Applicant: NIPPON STEEL Stainless Steel CorporationInventors: Yoshitomo FUJIMURA, Takahito HAMADA
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Publication number: 20230105051Abstract: Please amend the Abstract as originally filed as shown below wherein additions are indicated using underlining and deletions are indicated using strikethrough or double brackets in accordance with 37 C.F.R. § 1.121(b)(2): Realized is ferritic stainless steel which has excellent high-temperature strength and excellent red scale resistance. The ferritic stainless steel contains not more than 0.025% by mass of C, 0.05% by mass to 3.0% by mass of Si, 0.05% by mass to 2.0% by mass of Mn, not more than 0.04% by mass of P, not more than 0.003% 0.03% by mass of S, not more than 0.5% by mass of Ni, 10.5% by mass to 25.0% by mass of Cr, not more than 0.025% by mass of N, 0.05% by mass to 1.0% by mass of Nb, not more than 3.0% by mass of Mo, not more than 1.8% by mass of Cu, not more than 0.2% by mass of Al, and not more than 0.5% by mass of Ti.Type: ApplicationFiled: March 4, 2021Publication date: April 6, 2023Inventors: Yoshitomo Fujimura, Takahito Hamada, Taichiro Mizoguchi
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Publication number: 20190382874Abstract: The present invention relates to a ferritic stainless steel containing 0.03% by mass or less of C; from 0.1 to 0.8% by mass of Si; 1.0% by mass or less of Mn; 0.04% by mass or less of P; 0.01% by mass or less of S; 0.5% by mass or less of Ni; from 12.0 to 15.0% by mass of Cr; 0.03% by mass or less of N; from 0.1 to 0.5% by mass of Nb; from 0.8 to 1.5% by mass of Cu; and 0.1% by mass or less of Al, the balance being Fe and unavoidable impurities, the ferritic stainless steel having a ? max of 55 or less, as represented by the following equation (1): ? max=420C?11.5Si+7Mn+23Ni?11.5Cr+470N+9Cu?52Al+189??(1), in which C, Si, Mn, Ni, Cr, N, Cu and Al mean % by mass of the corresponding elements.Type: ApplicationFiled: September 5, 2017Publication date: December 19, 2019Inventors: Yoshihiro OKA, Yoshitomo FUJIMURA, Kazunari IMAKAWA
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Publication number: 20190039165Abstract: A method for welding austenitic stainless steel sheets, in which welding defects do not easily occur. Austenitic stainless steel sheets each with a sheet thickness of 0.6 to 1.0 mm, which each contain, in terms of mass %, 0.08% or less of C, 1.5 to 4.0% of Si, 2.0% or less of Mn, 0.04% or less of P, 0.01% or less of S, 16.0 to 22.0% of Cr, 10.0 to 14.0% of Ni, and 0.08% or less of N, and contain at least one of Nb and Ti in an amount of 1.0% or less in total, with the rest including Fe and inevitable impurities, are overlapped and the overlapped portion is welded by arc welding. In addition, the back side of a deposited portion is cooled from 1200° C. to 900° C. at a cooling rate of 110° C./sec or higher.Type: ApplicationFiled: August 30, 2016Publication date: February 7, 2019Applicant: NISSHIN STEEL CO., LTD.Inventors: Yoshitomo FUJIMURA, Kazunari IMAKAWA, Osamu YAMAMOTO, Manabu OKU, Isamu HAYAKAWA, Hiroaki SHICHI, Yoshihide NARUSE
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Publication number: 20130263979Abstract: A ferritic stainless steel useful as conduit members for emission of automotive exhaust gas consists of C up to 0.03 mass %, Si up to 1.0 mass %, Mn up to 1.5 mass %, Ni up to 0.6 mass %, 10-20 mass % of Cr, Nb up to 0.50 mass %, 0.8-2.0 mass % of Cu, Al up to 0.03 mass %, 0.03-0.20 mass % of V, N up to 0.03 mass % and the balance being Fe except inevitable impurities with a provision that at least 90% of Cu contained is dissolved in a steel matrix and that Nb?8(C+N). The steel may further contain 0.05-0.30 mass % of Ti and/or 0.0005-0.02 mass % of B. Mo as an inevitable impurity is controlled to be less than 0.10 mass %. The steel has excellent formability, low-temperature toughness and weldability as well as the same heat-resistance as Nb, Mo-alloyed steel.Type: ApplicationFiled: October 1, 2012Publication date: October 10, 2013Applicant: NISSHIN STEEL CO., LTD.Inventors: Manabu Oku, Yoshitomo Fujimura, Toshirou Nagoya
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Publication number: 20110176954Abstract: A ferritic stainless steel useful as conduit members for emission of automotive exhaust gas consists of C up to 0.03 mass %, Si up to 1.0 mass %, Mn up to 1.5 mass %, Ni up to 0.6 mass %, 10-20 mass % of Cr, Nb up to 0.50 mass %, 0.8-2.0 mass % of Cu, Al up to 0.03 mass %, 0.03-0.20 mass % of V, N up to 0.03 mass % and the balance being Fe except inevitable impurities with a provision of Nb?8(C+N). The steel may further contain 0.05-0.30 mass % of Ti and/or 0.0005-0.02 mass % of B. Mo as an inevitable impurity is controlled to be less than 0.10 mass %. The steel has excellent formability, low-temperature toughness and weldability as well as the same heat-resistance as Nb, Mo-alloyed steel.Type: ApplicationFiled: March 8, 2011Publication date: July 21, 2011Applicant: NISSHIN STEEL CO., LTD.Inventors: Manabu Oku, Yoshitomo Fujimura, Toshirou Nagoya
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Publication number: 20100122800Abstract: Provided is a ferritic stainless steel for heat pipes of high-temperature exhaust heat recovery systems, which comprises, in terms of % by mass, from 16 to 32% of Cr, at most 0.03% of C, at most 0.03% of N, at most 3% of Si, at most 2% of Mn, at most 0.008% of S, from 0 to 0.3% of Al, and at least one of at most 0.7% of Nb, at most 0.3% of Ti, at most 0.5% of Zr and at most 1% of V, and optionally at least one of at most 3% of Mo, at most 3% of W, at most 3% of Cu, at most 0.1% of Y, at most 0.1% of REM (rare earth metal) and at most 0.01% of Ca, with a balance of Fe and inevitable impurities, and which satisfies at least the following formula (1), formula (2) and formula (5): Cr+3(Mo+Cu)?20??(1) Cr+3(Si+Mn+Al?Ti)?20??(2) 0.037{(C+N)/(V+Ti+0.5Nb+0.5Zr)}+0.001?0.01??(5).Type: ApplicationFiled: November 13, 2009Publication date: May 20, 2010Inventors: Yukihiro Nishida, Yoshitomo Fujimura, Manabu Oku, Yuki Mukobara, Kimio Kohara, Kazuaki Kafuku
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Publication number: 20100119404Abstract: A ferritic stainless steel useful as conduit members for emission of automotive exhaust gas consists of C up to 0.03 mass %, Si up to 1.0 mass %, Mn up to 1.5 mass %, Ni up to 0.6 mass %, 10-20 mass % of Cr, Nb up to 0.50 mass %, 0.8-2.0 mass % of Cu, Al up to 0.03 mass %, 0.03-0.20 mass % of V, N up to 0.03 mass % and the balance being Fe except inevitable impurities with a provision of Nb?8(C+N). The steel may further contain 0.05-0.30 mass % of Ti and/or 0.0005-0.02 mass % of B. Mo as an inevitable impurity is controlled to be less than 0.10 mass %. The steel has excellent formability, low-temperature toughness and weldability as well as the same heat-resistance as Nb, Mo-alloyed steel.Type: ApplicationFiled: January 19, 2010Publication date: May 13, 2010Applicant: NISSHIN STEEL CO., LTD.Inventors: Manabu Oku, Yoshitomo Fujimura, Toshirou Nagoya
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Publication number: 20090053093Abstract: A ferritic stainless steel useful as conduit members for emission of automotive exhaust gas consists of C up to 0.03 mass %, Si up to 1.0 mass %, Mn up to 1.5 mass %, Ni up to 0.6 mass %, 10-20 mass % of Cr, Nb up to 0.50 mass %, 0.8-2.0 mass % of Cu, Al up to 0.03 mass %, 0.03-0.20 mass % of V, N up to 0.03 mass % and the balance being Fe except inevitable impurities with a provision of Nb?8(C+N). The steel may further contain 0.05-0.30 mass % of Ti and/or 0.0005-0.02 mass % of B. Mo as an inevitable impurity is controlled less than 0.10 mass %. The steel has excellent formability, low-temperature toughness and weldability as well as the same heat-resistance as Nb, Mo-alloyed steel.Type: ApplicationFiled: November 6, 2008Publication date: February 26, 2009Applicant: NISSHIN STEEL CO., LTD.Inventors: Manabu Oku, Yoshitomo Fujimura, Toshirou Nagoya
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Patent number: 7094295Abstract: A method of manufacturing a ferritic stainless steel sheet having good workability with less anisotropy. The steps include providing a ferritic stainless steel comprising C up to about 0.03 mass %, N up to about 0.03 mass %, Si up to about 2.0 mass %, Mn up to about 2.0 mass %, Ni up to about 0.6 mass %, Cr about 9–35 mass %, Nb about 0.15–0.80 mass % and the balance being Fe except inevitable impurities; precipitation-heating said stainless steel at a temperature in a range of 700–850° C. for a time period not longer than 25 hours; and finish-annealing said stainless steel at a temperature in a range of 900–1100° C. for a time period not longer than 1 minute.Type: GrantFiled: October 28, 2003Date of Patent: August 22, 2006Assignee: Nisshin Steel Co., Ltd.Inventors: Manabu Oku, Yoshitomo Fujimura, Yoshiaki Hori, Toshirou Nagoya, Yasutoshi Kunitake, Takeo Tomita
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Publication number: 20040170518Abstract: A ferritic stainless steel useful as conduit members for emission of automotive exhaust gas consists of C up to 0.03 mass %, Si up to 1.0 mass %, Mn up to 1.5 mass %, Ni up to 0.6 mass %, 10-20 mass % of Cr, Nb up to 0.50 mass %, 0.8-2.0 mass % of Cu, Al up to 0.03 mass %, 0.03-0.20 mass % of V, N up to 0.03 mass % and the balance being Fe except inevitable impurities with a provision of Nb≧8(C+N). The steel may further contain 0.05-0.30 mass % of Ti and/or 0.0005-0.02 mass % of B. Mo as an inevitable impurity is controlled less than 0.10 mass %. The steel has excellent formability, low-temperature toughness and weldability as well as the same heat-resistance as Nb, Mo-alloyed steel.Type: ApplicationFiled: January 2, 2004Publication date: September 2, 2004Inventors: Manabu Oku, Yoshitomo Fujimura, Toshirou Nagoya
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Publication number: 20040084116Abstract: A method of manufacturing a ferritic stainless steel sheet having good workability with less anisotropy. The steps include providing a ferritic stainless steel comprising C up to about 0.03 mass %, N up to about 0.03 mass %, Si up to about 2.0 mass %, Mn up to about 2.0 mass %, Ni up to about 0.6 mass %, Cr about 9-35 mass %, Nb about 0.15-0.80 mass % and the balance being Fe except inevitable impurities; precipitation-heating said stainless steel at a temperature in a range of 700-850° C. for a time period not longer than 25 hours; and finish-annealing said stainless steel at a temperature in a range of 900-1100° C. for a time period not longer than 1 minute.Type: ApplicationFiled: October 28, 2003Publication date: May 6, 2004Applicant: Nisshin Steel Co., Ltd.Inventors: Manabu Oku, Yoshitomo Fujimura, Yoshiaki Hori, Toshirou Nagoya, Yasutoshi Kunitake, Takeo Tomita
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Publication number: 20040065390Abstract: A low-cost ferritic steel sheet possessing not only formability enabling application to complexly configured automobile exhaust gas passage components but also high-temperature strength, high-temperature oxidation resistance and low-temperature toughness as good as or superior to existing ferritic steels, which ferritic steel sheet comprises, in mass percent, C: not more than 0.02%, Si: 0.7-1.1%, Mn: not more than 0.8%, Ni: not more than 0.5%, Cr: 8.0 to less than 11.0%, N: not more than 0.02%, Nb: 0.10-0.50%, Ti: 0.07-0.25%, Cu: 0.02-0.5%, B: 0.0005-0.02%, V: 0 (no addition)-0.20%, one or both of Ca and Mg: 0 (no addition)-0.01% in total, one or more elements among Y and rare earth elements: 0 (no addition)-0.20% in total, and the balance of Fe and unavoidable impurities, and satisfies 3Cr+40Si≧61, Cr+10Si≦21, and 420C−11.5Si+7Mn+23Ni−11.5Cr−12Mo+9Cu−49Ti−25(Nb+V)−52Al+470N+189≦70.Type: ApplicationFiled: September 26, 2003Publication date: April 8, 2004Inventors: Manabu Oku, Yoshiaki Hori, Yoshitomo Fujimura, Takeshi Utsunomiya
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Patent number: 6673166Abstract: The newly proposed ferritic stainless steel sheet consists of C up to 0.03 mass %, N up to 0.03 mass %, Si up to 2.0 mass %, Mn up to 2.0 mass %, Ni up to 0.6 mass %, 9-35 mass % Cr, 0.15-0.80 mass % Nb, optionally one or more of Ti up to 0.5 mass %, Mo up to 3.0 mass %, Cu up to 2.0 mass % and Al up to 6.0 mass %, and the balance being Fe except inevitable impurities, comprises metallurgical structure involving precipitates of 2 &mgr;m or less in particle size at a ratio not more than 0.5 mass % and has crystalline orientation on a rolled surface at ¼ depth of thickness with Integrated Density defined by the formula (a) not less than 1.2. The ferritic stainless steel sheet is manufactured by 25 hours or shorter precipitation-treatment at 700-850° C. in prior to 1 minute or shorter finish-annealing at 900-1100° C. Integrated Intensity is made greater than 2.0 by controlling particle size of precipitates not more than 0.5 &mgr;m, so as to realize good workability with less in-plane anisotropy.Type: GrantFiled: December 21, 2001Date of Patent: January 6, 2004Assignee: Nisshin Steel Co., Ltd.Inventors: Manabu Oku, Yoshitomo Fujimura, Yoshiaki Hori, Toshirou Nagoya, Yasutoshi Kunitake, Takeo Tomita
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Publication number: 20020117239Abstract: The newly proposed ferritic stainless steel sheet consists of C up to 0.03 mass %, N up to 0.03 mass %, Si up to 2.0 mass %, Mn up to 2.0 mass %, Ni up to 0.6 mass %, 9-35 mass % Cr, 0.15-0.80 mass % Nb, optionally one or more of Ti up to 0.5 mass %, Mo up to 3.0 mass %, Cu up to 2.0 mass % and Al up to 6.0 mass %, and the balance being Fe except inevitable impurities, comprises metallurgical structure involving precipitates of 2 &mgr;m or less in particle size at a ratio not more than 0.5 mass % and has crystalline orientation on a rolled surface at ¼ depth of thickness with Integrated Density defined by the formula (a) not less than 1.2. The ferritic stainless steel sheet is manufactured by 25 hours or shorter precipitation-treatment at 700-850 ° C in prior to 1 minute or shorter finish-annealing at 900-1100 ° C. Integrated Intensity is made greater than 2.0 by controlling particle size of precipitates not more than 0.5 &mgr;m, so as to realize good workability with less in-plane anisotropy.Type: ApplicationFiled: December 21, 2001Publication date: August 29, 2002Applicant: NISSHIN STEEL CO., LTD.Inventors: Manabu Oku, Yoshitomo Fujimura, Yoshiaki Hori, Toshirou Nagoya, Yasutoshi Kunitake, Takeo Tomita