Patents by Inventor Katsuhisa Yamauchi
Katsuhisa Yamauchi 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: 11230756Abstract: Provided is a ferritic stainless steel that has good corrosion resistance and which exhibits good brazeability when subjected to high-temperature brazing with a Ni-containing brazing filler metal. The ferritic stainless steel has a composition containing, in mass %, C: 0.003 to 0.020%, Si: 0.05 to 0.60%, Mn: 0.05 to 0.50%, P: 0.04% or less, S: 0.02% or less, Cr: 17.0 to 24.0%, Ni: 0.20 to 0.80%, Cu: 0.01 to 0.80%, Mo: 0.01 to 2.50%, Al: 0.001 to 0.015%, Nb: 0.25 to 0.60%, and N: 0.020% or less, with the balance being Fe and incidental impurities, the composition satisfying formula (1) below and formula (2) below, Cu+Mo?0.30??(1) 4Ni?(Si+Mn)?0??(2) (wherein Cu and Mo in formula (1) and Ni, Si, and Mn in formula (2) each represent the content (mass %) of the corresponding element).Type: GrantFiled: August 25, 2017Date of Patent: January 25, 2022Assignee: JFE Steel CorporationInventors: Takayoshi Yano, Kunio Fukuda, Shin Ishikawa, Katsuhisa Yamauchi, Reiko Sugihara, Hideya Matsumoto
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Publication number: 20210102279Abstract: A ferritic stainless steel having good corrosion resistance and good brazability in the case where brazing is performed with a Ni-containing brazing filler metal at a high temperature. The ferritic stainless steel has a chemical composition comprising, by mass %, C: 0.003% to 0.020%, Si: 0.05% to 0.60%, Mn: 0.05% to 0.30%, P: 0.040% or less, S: 0.020% or less, Cr: 17.0% to 22.0%, Ni: 0.20% to 0.80%, Cu: 0.30% to 0.80%, Mo: 0.01% to 0.10%, Al: 0.001% to 0.015%, Nb: 0.25% to 0.60%, N: 0.020% or less, and the balance being Fe and inevitable impurities. The expression 4Ni?(Si+Mn)?0.00% is satisfied, where each of Ni, Si, and Mn denotes a content, by mass %, of a corresponding element.Type: ApplicationFiled: January 21, 2019Publication date: April 8, 2021Applicant: JFE STEEL CORPORATIONInventors: Takayoshi YANO, Manami ICHIKAWA, Tetsuyuki NAKAMURA, Kunio FUKUDA, Shin ISHIKAWA, Reiko SUGIHARA, Katsuhisa YAMAUCHI, Hideya MATSUMOTO
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Patent number: 10458013Abstract: 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 ?m of a surface of the steel.Type: GrantFiled: November 17, 2015Date of Patent: October 29, 2019Assignee: JFE STEEL CORPORATIONInventors: Kunio Fukuda, Shin Ishikawa, Mitsuyuki Fujisawa, Katsuhisa Yamauchi, Chikara Kami
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Publication number: 20190177825Abstract: Provided is a ferritic stainless steel that has good corrosion resistance and which exhibits good brazeability when subjected to high-temperature brazing with a Ni-containing brazing filler metal. The ferritic stainless steel has a composition containing, in mass %, C: 0.003 to 0.020%, Si: 0.05 to 0.60%, Mn: 0.05 to 0.50%, P: 0.04% or less, S: 0.02% or less, Cr: 17.0 to 24.0%, Ni: 0.20 to 0.80%, Cu: 0.01 to 0.80%, Mo: 0.01 to 2.50%, Al: 0.001 to 0.015%, Nb: 0.25 to 0.60%, and N: 0.020% or less, with the balance being Fe and incidental impurities, the composition satisfying formula (1) below and formula (2) below, Cu+Mo?0.30??(1) 4Ni?(Si+Mn)?0??(2) (wherein Cu and Mo in formula (1) and Ni, Si, and Mn in formula (2) each represent the content (mass %) of the corresponding element).Type: ApplicationFiled: August 25, 2017Publication date: June 13, 2019Applicant: JFE Steel CorporationInventors: Takayoshi Yano, Kunio Fukuda, Shin Ishikawa, Katsuhisa Yamauchi, Reiko Sugihara, Hideya Matsumoto
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Publication number: 20170349995Abstract: 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 ?m of a surface of the steel.Type: ApplicationFiled: November 17, 2015Publication date: December 7, 2017Applicant: JFE STEEL CORPORATIONInventors: Kunio FUKUDA, Shin ISHIKAWA, Mitsuyuki FUJISAWA, Katsuhisa YAMAUCHI, Chikara KAMI
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Patent number: 8607941Abstract: A steel sheet for a brake disc contains, on a mass percent basis, 0.02% or more and less than 0.10% C, 0.6% or less Si, more than 0.5% and 2.0% or less Mn, 0.06% or less P, 0.01% or less S, 0.05% or less Al, 11.0% to 13.5% Cr, 0.01% to 0.30% Ni, 0.10% to 0.60% Nb, 0.03% or more and less than 0.10% N, more than 0.0010% and 0.0060% or less B, and the balance being Fe and incidental impurities, and the steel sheet after quenching has a hardness of 32 HRC to 40 HRC on a Rockwell hardness scale C (HRC).Type: GrantFiled: May 31, 2010Date of Patent: December 17, 2013Assignee: JFE Steel CorporationInventors: Katsuhisa Yamauchi, Mitsuyuki Fujisawa, Yasushi Kato, Hiroki Ota, Hideya Furusawa, Takumi Ujiro
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Patent number: 8333849Abstract: A material for brake discs has temper softening resistance sufficient to maintain a hardness of HRC 31 or more after tempering at 700° C. for one hour. The low-carbon martensitic chromium-containing steel contains 0.02% to 0.10% of carbon and 0.02% to 0.10% of nitrogen, the total content of carbon and nitrogen being 0.08% to 0.16%; 0.5% or less of silicon; 0.1% or less of aluminum; 0.3% to 3.0% of manganese; 10.5% to 13.5% of chromium; 0.05% to 0.60% of niobium and 0.15% to 0.80% of vanadium, the total content of niobium and vanadium being 0.25% to 0.95%; 0.02% to 2.0% of nickel; and 1.5% or less of copper, and has an Fp value (=?230C+5Si?5Mn?6Cu+10Cr?12Ni+32Nb+22V+l2Mo+8W+10Ta+40A1?220N) of 80.0 to 96.0, a hardness after quenching of HRC 31 to 40, and a hardness after tempering at 700° C. for one hour of HRC 31 or more.Type: GrantFiled: April 23, 2009Date of Patent: December 18, 2012Assignee: JFE Steel CorporationInventors: Katsuhisa Yamauchi, Yasushi Kato, Takumi Ujiro, Takako Yamashita
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Publication number: 20120125724Abstract: A steel sheet for a brake disc contains, on a mass percent basis, 0.02% or more and less than 0.10% C, 0.6% or less Si, more than 0.5% and 2.0% or less Mn, 0.06% or less P, 0.01% or less S, 0.05% or less Al, 11.0% to 13.5% Cr, 0.01% to 0.30% Ni, 0.10% to 0.60% Nb, 0.03% or more and less than 0.10% N, more than 0.0010% and 0.0060% or less B, and the balance being Fe and incidental impurities, and the steel sheet after quenching has a hardness of 32 HRC to 40 HRC on a Rockwell hardness scale C (HRC).Type: ApplicationFiled: May 31, 2010Publication date: May 24, 2012Applicant: JFE STEEL CORPORATIONInventors: Katsuhisa Yamauchi, Mitsuyuki Fujisawa, Yasushi Kato, Hiroki Ota, Hideya Furusawa, Takumi Ujiro
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Publication number: 20110030851Abstract: A material for brake discs has temper softening resistance sufficient to maintain a hardness of HRC 31 or more after tempering at 700° C. for one hour. The low-carbon martensitic chromium-containing steel contains 0.02% to 0.10% of carbon and 0.02% to 0.10% of nitrogen, the total content of carbon and nitrogen being 0.08% to 0.16%; 0.5% or less of silicon; 0.1% or less of aluminum; 0.3% to 3.0% of manganese; 10.5% to 13.5% of chromium; 0.05% to 0.60% of niobium and 0.15% to 0.80% of vanadium, the total content of niobium and vanadium being 0.25% to 0.95%; 0.02% to 2.0% of nickel; and 1.5% or less of copper, and has an Fp value (=?230C+5Si?5Mn?6Cu+10Cr?12Ni+32Nb+22V+12Mo+8W+10Ta+40Al?220N) of 80.0 to 96.0, a hardness after quenching of HRC 31 to 40, and a hardness after tempering at 700° C. for one hour of HRC 31 or more.Type: ApplicationFiled: April 23, 2009Publication date: February 10, 2011Applicant: JFE STEEL CORPORATIONInventors: Katsuhisa Yamauchi, Yasushi Kato, Takumi Ujiro, Takako Yamashita
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Patent number: 5496514Abstract: A fracture resistant stainless steel sheet comprises: non-metallic inclusions of Al.sub.2 O.sub.3, MnO, and SiO.sub.2 which inevitably exist in stainless steel; the non-metallic inclusions having a composition situated in a region defined by nine points in a phase diagram of a 3-component system of "Al.sub.2 O.sub.3 --MnO--SiO.sub.2 "; the stainless steel sheet having an 1.0% on-set stress of at least 1520 N/mm.sup.2 (155 kgf/mm.sup.2); the stainless steel sheet having an anisotropic difference of 1.0% on-set stress of 196 N/mm.sup.2 (20 kgf/mm.sup.2) or less; and the stainless steel sheet having a Erichsen number of at least 4.6 mm.A method for producing a high fracture resistant stainless steel sheet comprises the steps of: preparing a stainless steel strip; applying to the stainless steel strip a process of annealing--pickling --first cold rolling (CR.sub.1)--first intermediate annealing--second cold rolling (CR.sub.2)--second intermediate annealing--third cold rolling (CR.sub.Type: GrantFiled: February 1, 1994Date of Patent: March 5, 1996Assignee: NKK CorporationInventors: Katsuhisa Yamauchi, Hitoshi Misao, Tadashi Inoue, Tomoyoshi Okita
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Patent number: 5407493Abstract: A fracture resistant stainless steel sheet comprises: non-metallic inclusions of Al.sub.2 O.sub.3, MnO, and SiO.sub.2 which inevitably exist in stainless steel; the non-metallic inclusions having a composition situated in a region defined by nine points in a phase diagram of a 3-component system of "Al.sub.2 O.sub.3 -MnO-SiO.sub.2 "; the stainless steel sheet having an 1.0% on-set stress of at least 1520 N/mm.sup.2 (155 kgf/mm.sup.2); the stainless steel sheet having an anisotropic difference of 1.0% on-set stress of 196 N/mm.sup.2 (20 kgf/mm.sup.2) or less; and the stainless steel sheet having a punch test work load of at least 25 kgf.multidot.mm or more.A method for producing a high fracture resistant stainless steel sheet comprises the steps of: preparing a stainless steel strip; applying to the stainless steel strip a process of annealing--pickling --first cold rolling (CR.sub.1)--first intermediate annealing--second cold rolling (CR.sub.2)--second intermediate annealing--third cold rolling (CR.sub.Type: GrantFiled: January 31, 1994Date of Patent: April 18, 1995Assignee: NKK CorporationInventors: Katsuhisa Yamauchi, Hitoshi Misao, Tadashi Inoue, Tomoyoshi Okita
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Patent number: 5314549Abstract: A stainless steel sheet essentially consisting of: 0.01 to 0.2 wt. % C, 0.1 to 2 wt. % Si, 0.1 to 2 wt. % Mn, 4 to 11 wt. % Ni, 13 to 20 wt. % Cr, 0.01 to 0.2 wt. % N, 0.0005 to 0.0025 wt. % sol.Al, 0.002 to 0.01 wt. % O, 0.009 wt. % or less S, and the balance being Fe and inevitable impurities; the sheet containing 40 to 90% martensite; and the steel sheet having a 1400 N/mm.sup.2 or more tensile stress when a tensile strain is 1.0%. The invention also provides a method for producing a stainless steel sheet comprising the steps of: applying to the steel sheet a process of first cold rolling (CR.sub.1)--first intermediate annealing--second cold rolling (CR.sub.2)--second intermediate annealing--third cold rolling (CR.sub.3)--the final annealing--fourth cold rolling (CR.sub.4)--low temperature heat treatment; the first-, second- and third cold reduction ratio being 30% to 60%; the annealing temperatures in the first-, second- and final annealing being in the range of 950.degree. C. to 1100.degree. C.Type: GrantFiled: July 29, 1993Date of Patent: May 24, 1994Assignee: NKK CorporationInventors: Hitoshi Misao, Katsuhisa Yamauchi, Tadashi Inoue, Tomoyoshi Okita