Patents by Inventor Mitsuyuki Fujisawa
Mitsuyuki Fujisawa 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).
-
Patent number: 11767573Abstract: A ferritic stainless steel sheet comprises a chemical composition containing, in mass %, C: 0.030% or less, Si: 3.0% or less, Mn: 1.0% or less, P: 0.040% or less, S: 0.010% or less, Cr: 11.0% to 30.0%, Al: 8.0% to 20.0%, Ni: 0.05% to 0.50%, N: 0.020% or less, and at least one selected from the group consisting of Zr: 0.01% to 0.20% and Hf: 0.01% to 0.20%, with a balance consisting of Fe and inevitable impurities.Type: GrantFiled: August 26, 2019Date of Patent: September 26, 2023Assignee: JFE STEEL CORPORATIONInventors: Akito Mizutani, Rinta Sato, Mitsuyuki Fujisawa
-
Publication number: 20230271405Abstract: A method of producing a ferritic stainless steel sheet comprises subjecting an Al vapor deposited layer-equipped stainless steel sheet to a heat treatment at 600° C. to 1300° C. for 1 minute or more. The Al vapor deposited layer-equipped stainless steel sheet comprises a ferritic stainless steel and an Al vapor deposited layer thereon. The ferritic stainless steel sheet has a thickness of 100 ?m or less and a chemical composition containing, in mass %, C: ?0.030%, Si: ?1.0%, Mn: ?1.0%, P: ?0.040%, S: ?0.010%, Cr: 11.0-30.0%, Al: 4.0-6.5%, Ni: 0.05-0.50%, Mo: 0.01-6.0%, N: ?0.020% s, and Zr: 0.01-0.20% and/or Hf: 0.01-0.20%, with a balance consisting of Fe and inevitable impurities. A thickness of the Al vapor deposited layer per one side is 0.5-10.0 ?m.Type: ApplicationFiled: May 8, 2023Publication date: August 31, 2023Applicant: JFE STEEL CORPORATIONInventors: Akito MIZUTANI, Mitsuyuki FUJISAWA
-
Publication number: 20230193474Abstract: In an Al coating layer-equipped stainless steel sheet, a base steel sheet has a predetermined chemical composition, and a total content of Fe and Cr at a first depth of an Al coating layer is 20 mass % to 70 mass %.Type: ApplicationFiled: April 20, 2021Publication date: June 22, 2023Applicant: JFE STEEL CORPORATIONInventors: Akito MIZUTANI, Mitsuyuki FUJISAWA
-
Patent number: 11560604Abstract: Provided is a ferritic stainless steel in which cracking is unlikely to be caused in the vicinity of a weld zone by the stress due to expansion, contraction, and deformation due to the thermal effect of welding in the case of performing welding after deep drawing and which is excellent in corrosion resistance in the vicinity of the weld zone. The ferritic stainless steel has a composition containing C: 0.001% to 0.020%, Si: 0.01% to 0.30%, Mn: 0.01% to 0.50%, P: 0.04% or less, S: 0.01% or less, Cr: 18.0% to 24.0%, Ni: 0.01% to 0.40%, Mo: 0.30% to 3.0%, Al: 0.01% to 0.15%, Ti: 0.01% to 0.50%, Nb: 0.01% to 0.50%, V: 0.01% to 0.50%, Co: 0.01% to 6.00%, B: 0.0002% to 0.0050%, and N: 0.001% to 0.020% on a mass basis, the remainder being Fe and inevitable impurities. The composition satisfies 0.30%?Ti+Nb+V?0.60%.Type: GrantFiled: May 25, 2017Date of Patent: January 24, 2023Assignee: JFE STEEL CORPORATIONInventors: Tomohiro Ishii, Mitsuyuki Fujisawa, Reiko Sugihara, Chikara Kami
-
Patent number: 11497085Abstract: A Fe—Cr alloy having a chemical composition with increased Si and Al contents, in which the chemical composition satisfies the following formula (1) in terms of the Si content, Al content, and Cr content: 14.0?% Si+1.15×% Al+0.35×% Cr ??(1).Type: GrantFiled: December 5, 2018Date of Patent: November 8, 2022Assignee: JFE STEEL CORPORATIONInventors: Akito Mizutani, Tatsuhiko Hiratani, Mitsuyuki Fujisawa
-
Publication number: 20220267883Abstract: A predetermined chemical composition is contained, and a predetermined relationship of the contents of Ag, B and REM is satisfied.Type: ApplicationFiled: June 4, 2020Publication date: August 25, 2022Applicant: JFE STEEL CORPORATIONInventors: Akito MIZUTANI, Mitsuyuki FUJISAWA
-
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
-
Patent number: 11377702Abstract: A ferritic stainless steel sheet comprises: a predetermined chemical composition, wherein a difference between a maximum value and a minimum value of Vickers hardness in a thickness direction is HV 50 or less.Type: GrantFiled: April 22, 2019Date of Patent: July 5, 2022Assignee: JFE STEEL CORPORATIONInventors: Hidetaka Kawabe, Mitsuyuki Fujisawa, Hiroshi Shimizu, Tomohiko Uchino
-
Publication number: 20220170144Abstract: Provided is an Al or Al alloy-coated stainless steel sheet having a coating substrate and a hot-dip Al or Al alloy coated layer provided on a surface of the coating substrate, the coating substrate having a predetermined chemical composition, the Mo content and W content of the chemical composition of the coating substrate, the thickness of the coating substrate, and the thickness of the hot-dip Al or Al alloy coated layer satisfying predetermined relations.Type: ApplicationFiled: April 24, 2020Publication date: June 2, 2022Applicant: JFE STEEL CORPORATIONInventors: Akito MIZUTANI, Mitsuyuki FUJISAWA
-
Publication number: 20220118740Abstract: A ferritic stainless steel sheet comprises a chemical composition containing, in mass %, C: 0.030% or less, Si: 1.0% or less, Mn: 1.0% or less, P: 0.040% or less, S: 0.010% or less, Cr: 11.0% to 30.0%, Al: 8.0% to 20.0%, Ni: 0.05% to 0.50%, Mo: 0.01% to 6.0%, N: 0.020% or less, and at least one selected from the group consisting of Zr: 0.01% to 0.20% and Hf: 0.01% to 0.20%, with a balance consisting of Fe and inevitable impurities.Type: ApplicationFiled: January 8, 2020Publication date: April 21, 2022Applicant: JFE STEEL CORPORATIONInventors: Akito MIZUTANI, Mitsuyuki FUJISAWA
-
Publication number: 20220056547Abstract: A ferritic stainless steel sheet comprises a chemical composition containing, in mass %, C: 0.030% or less, Si: 3.0% or less, Mn: 1.0% or less, P: 0.040% or less, S: 0.010% or less, Cr: 11.0% to 30.0%, Al: 8.0% to 20.0%, Ni: 0.05% to 0.50%, N: 0.020% or less, and at least one selected from the group consisting of Zr: 0.01% to 0.20% and Hf: 0.01% to 0.20%, with a balance consisting of Fe and inevitable impurities.Type: ApplicationFiled: August 26, 2019Publication date: February 24, 2022Applicant: JFE STEEL CORPORATIONInventors: Akito MIZUTANI, Rinta SATO, Mitsuyuki FUJISAWA
-
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
-
Publication number: 20220015196Abstract: A method for producing a Fe—Cr alloy comprises: rolling a slab having a chemical composition containing, by mass %, C: 0.020% or less, Si: 0.01% to 1.5%, Mn: 1.0% or less, P: 0.040% or less, S: 0.010% or less, Cr: 16.0% to 30.0%, Al: 2.0% to 6.5%, N: 0.020% or less, and Ni: 0.50% or less, with the balance being Fe and inevitable impurities to obtain a sheet material; subjecting the sheet material to siliconizing treatment by a thermal CVD method to obtain a Fe—Cr alloy having a Si content of more than 1.5 mass % and 10.0 mass % or less and satisfying: 14.0%?Si+1.15×% Al+0.35×% Cr??(1) where % Si, % Al, and % Cr indicate Si, Al, and Cr contents, by mass %, respectively in the chemical composition of the Fe—Cr alloy.Type: ApplicationFiled: September 28, 2021Publication date: January 13, 2022Applicant: JFE STEEL CORPORATIONInventors: Akito Mizutani, Tatsuhiko Hiratani, Mitsuyuki Fujisawa
-
Patent number: 11220732Abstract: Provided is a ferritic stainless steel sheet excellent in shape of weld zone and corrosion resistance of a weld zone with a material of a different kind formed by performing welding with austenitic stainless steel. A ferritic stainless steel sheet having a chemical composition containing, by mass %, C: 0.003% to 0.020%, Si: 0.01% to 1.00%, Mn: 0.01% to 0.50%, P: 0.040% or less, S: 0.010% or less, Cr: 20.0% to 24.0%, Cu: 0.20% to 0.80%, Ni: 0.01% to 0.60%, Al: 0.01% to 0.08%, N: 0.003% to 0.020%, Nb: 0.40% to 0.80%, Ti: 0.01% to 0.10%, Zr: 0.01% to 0.10%, and the balance being Fe and inevitable impurities, in which relational expression (1) below is satisfied: 3.0?Nb/(2Ti+Zr+0.5Si+5Al)?1.5??(1), here, in relational expression (1), each of the atomic symbols denotes the content (mass %) of the corresponding chemical element.Type: GrantFiled: June 15, 2017Date of Patent: January 11, 2022Assignee: JFE STEEL CORPORATIONInventors: Hidetaka Kawabe, Shuji Nishida, Mitsuyuki Fujisawa, Chikara Kami
-
Patent number: 11174540Abstract: Provided is a hot-rolled and annealed ferritic stainless steel sheet excellent in surface quality after bending work has been performed. A hot-rolled and annealed ferritic stainless steel sheet has a thickness of 5.0 mm or more and a chemical composition containing, by mass %, C: 0.001% to 0.025%, Si: 0.05% to 0.70%, Mn: 0.05% to 0.50%, P: 0.050% or less, S: 0.01% or less, Cr: 10.0% to 18.0%, Ni: 0.01% to 1.00%, Al: 0.001% to 0.10%, N: 0.001% to 0.025%, Ti: 0.01% to 0.40%, and a balance of Fe and inevitable impurities, in which a difference between maximum and minimum values of an average crystal grain diameter determined by using measuring method 1 is 50 ?m or less, and in which a difference between maximum and minimum values of a crystal grain elongation rate determined by using measuring method 2 is 5.0 or less.Type: GrantFiled: September 21, 2018Date of Patent: November 16, 2021Assignee: JFE Steel CorporationInventors: Hidetaka Kawabe, Mitsuyuki Fujisawa, Hiroshi Shimizu, Tomohiko Uchino
-
Patent number: 11142814Abstract: Provided is a ferritic-austenitic duplex stainless steel sheet in which no blowholes are formed during welding and which has excellent strength. A chemical composition includes, in mass %, C: 0.10% or less, Si: 1.0% or less, Mn: 2.0 to 7.0%, P: 0.07% or less, S: 0.030% or less, Cr: 18.0 to 24.0%, Ni: 0.1 to 3.0%, Mo: 0.01 to 1.0%, Cu: 0.1 to 3.0%, Al: 0.003 to 0.10%, Zr: 0.01 to 0.50%, and N: 0.15 to 0.30%, with the balance being Fe and incidental impurities, the chemical composition satisfying formula (1) below and formula (2) below. N—Zr/6.5?0.15%??(1) N—Zr/6.5?0.23%??(2) Here, in formula (1) and formula (2), N represents a content (mass %) of the corresponding chemical element N and Zr represents a content (mass %) of the corresponding chemical element Zr.Type: GrantFiled: January 18, 2018Date of Patent: October 12, 2021Assignee: JFE STEEL CORPORATIONInventors: Akito Mizutani, Mitsuyuki Fujisawa
-
Publication number: 20210277494Abstract: Provided is a ferritic stainless steel in which cracking is unlikely to be caused in the vicinity of a weld zone by the stress due to expansion, contraction, and deformation due to the thermal effect of welding in the case of performing welding after deep drawing and which is excellent in corrosion resistance in the vicinity of the weld zone. The ferritic stainless steel has a composition containing C: 0.001% to 0.020%, Si: 0.01% to 0.30%, Mn: 0.01% to 0.50%, P: 0.04% or less, S: 0.01% or less, Cr: 18.0% to 24.0%, Ni: 0.01% to 0.40%, Mo: 0.30% to 3.0%, Al: 0.01% to 0.15%, Ti: 0.01% to 0.50%, Nb: 0.01% to 0.50%, V: 0.01% to 0.50%, Co: 0.01% to 6.00%, B: 0.0002% to 0.0050%, and N: 0.001% to 0.020% on a mass basis, the remainder being Fe and inevitable impurities. The composition satisfies 0.30%?Ti+Nb+V?0.60%.Type: ApplicationFiled: May 25, 2017Publication date: September 9, 2021Applicant: JFE Steel CorporationInventors: Tomohiro Ishii, Mitsuyuki Fujisawa, Reiko Sugihara, Chikara Kami
-
Publication number: 20210269890Abstract: A ferritic stainless steel sheet comprises: a predetermined chemical composition, wherein a difference between a maximum value and a minimum value of Vickers hardness in a thickness direction is HV 50 or less.Type: ApplicationFiled: April 22, 2019Publication date: September 2, 2021Applicant: JFE STEEL CORPORATIONInventors: Hidetaka KAWABE, Mitsuyuki FUJISAWA, Hiroshi SHIMIZU, Tomohiko UCHINO
-
Patent number: 11008636Abstract: A stainless steel foil having a chemical composition comprising, by mass %, C: 0.015% or less, Si: 0.50% or less, Mn: 0.50% or less, P: 0.040% or less, S: 0.010% or less, Cr: 10.0% or more and less than 16.0%, Al: 2.5 to 4.5%, N: 0.015% or less, Ni: 0.05 to 0.50%, Cu: 0.01 to 0.10%, Mo: 0.01 to 0.15%, at least one selected from the group consisting of Ti: 0.01 to 0.30%, Zr: 0.01 to 0.20%, Hf: 0.01 to 0.20%, and REM: 0.01 to 0.20%, where Ti+Zr+Hf+2REM?0.06 and 0.30?Ti+Zr+Hf are satisfied.Type: GrantFiled: October 16, 2017Date of Patent: May 18, 2021Assignee: JFE STEEL CORPORATIONInventors: Akito Mizutani, Mitsuyuki Fujisawa
-
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