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).
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Patent number: 10227674Abstract: Provided is a ferritic stainless steel foil having an excellent ability to form whiskers is obtained by its composition containing, by mass, C: 0.050% or less, Si: 2.00% or less, Mn: 0.50% or less, S: 0.010% or less, P: 0.050% or less, Cr: 15.0% or more and 30.0% or less, Al: 2.5% or more and 6.5% or less, N: 0.050% or less, one or more elements selected from Ti: 0.01% or more and 0.50% or less, Nb: 0.01% or more and 0.20% or less, V: 0.01% or more and 0.20% or less, Zr: 0.005% or more and 0.200% or less, and Hf: 0.005% or more and 0.200% or less, and the balance being Fe and inevitable impurities, the proportion of a {111} crystal grain (a crystal grain such that the difference between the {111} plane of the crystal grain and a direction perpendicular to the surface of the foil falls within ±15°) on the surface of the foil being 50% by area or more, and the thickness of an oxide layer formed on the surface of the foil being 0.1 ?m or less.Type: GrantFiled: February 24, 2015Date of Patent: March 12, 2019Assignee: JFE STEEL CORPORATIONInventors: Akito Mizutani, Mitsuyuki Fujisawa
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Publication number: 20190055634Abstract: Provided is a ferritic stainless steel sheet excellent in terms of corrosion resistance with which a decrease in the quantity of surface defects and an improvement in toughness are realized at the same time. The ferritic stainless steel sheet has a chemical composition containing, by mass %, C: 0.020% or less, Si: 0.05% to 0.40%, Mn: 0.05% to 1.00%, P: 0.040% or less, S: 0.030% or less, Al: 0.001% to 0.15%, Cr: 20.0% to 23.0%, Ni: 0.01% to 0.80%, Cu: 0.30% to 0.80%, Ti: 0.10% to 0.50%, Nb: 0.010% to 0.150%, Zr: 0.005% to 0.150%, N: 0.020% or less, and the balance being Fe and inevitable impurities, in which relational expression (1) below is satisfied. Zr?Nb?Ti??(1) (Here, each of Zr, Nb, and Ti in relational expression (1) denotes the content (mass %) of the corresponding chemical element.Type: ApplicationFiled: September 26, 2016Publication date: February 21, 2019Applicant: JFE STEEL CORPORATIONInventors: Shuji Nishida, Tomohiro Ishii, Mitsuyuki Fujisawa, Chikara Kami
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Patent number: 10151020Abstract: The ferritic stainless steel foil has a composition containing, by mass %, C: 0.050% or less, Si: 0.20% or less, Mn: 0.20% or less, P: 0.050% or less, S: 0.0050% or less, Cr: 10.5% or more and 20.0% or less, Ni: 0.01% or more and 1.00% or less, Al: more than 1.5% and less than 3.0%, Cu: 0.01% or more and 1.00% or less, N: 0.10% or less, and further contains one or more elements selected from Ti: 0.01% or more and 1.00% or less, Zr: 0.01% or more and 0.20% or less, and Hf: 0.01% or more and 0.20% or less, and the balance being Fe and inevitable impurities. This enables a composite layer of an Al oxide layer and a Cr oxide layer to be formed on the surface of the ferritic stainless steel foil in a high-temperature oxidizing atmosphere at 800° C. or more.Type: GrantFiled: July 16, 2014Date of Patent: December 11, 2018Assignee: JFE Steel CorporationInventors: Akito Mizutani, Mitsuyuki Fujisawa, Hiroyuki Ogata
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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
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Publication number: 20180202023Abstract: Provided are a hot rolled ferritic stainless steel sheet and a hot rolled and annealed ferritic stainless steel sheet and methods for manufacturing these steel sheets. A hot rolled ferritic stainless steel sheet having a chemical composition containing, by mass %, C: 0.005% to 0.060%, Si: 0.02% to 0.50%, Mn: 0.01% to 1.00%, P: 0.04% or less, S: 0.01% or less, Cr: 15.5% to 18.0%, Al: 0.001% to 0.10%, N: 0.005% to 0.100%, Ni: 0.1% to 1.0%, and the balance being Fe and inevitable impurities and an absolute value of planar anisotropy in terms of modulus of longitudinal elasticity below of 35 GPa or less.Type: ApplicationFiled: July 11, 2016Publication date: July 19, 2018Applicant: JFE STEEL CORPORATIONInventors: Masataka Yoshino, Mitsuyuki Fujisawa, Chikara Kami
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Publication number: 20180171430Abstract: Provided are a ferritic stainless steel sheet and a method for manufacturing the steel sheet. The ferritic stainless steel sheet according to the present invention has a chemical composition containing, by mass %, C: 0.005% to 0.025%, Si: 0.02% to 0.50%, Mn: 0.55% to 1.00%, P: 0.04% or less, S: 0.01% or less, Al: 0.001% to 0.10%, Cr: 15.5% to 18.0%, Ni: 0.1% to 1.0%, N: 0.005% to 0.025%, and the balance being Fe and inevitable impurities, an elongation after fracture of 28% or more, an average r-value of 0.75 or more, and a minimum value of maximum logarithmic strain at the forming limit, which is, determined on the basis of a forming limit diagram (FLD), of 0.15 or more.Type: ApplicationFiled: July 2, 2015Publication date: June 21, 2018Applicant: JFE STEEL CORPORATIONInventors: Masataka Yoshino, Akito Mizutani, Mitsuyuki Fujisawa, Chikara Kami
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Patent number: 10000824Abstract: A material for stainless steel cold rolling suitable for producing a cold-rolled stainless steel sheet that has sufficient corrosion resistance and ridging resistance as well as excellent formability and surface properties is provided. The material for stainless steel cold rolling according to the present invention contains, in terms of % by mass, C: 0.007% to 0.05%, Si: 0.02% to 0.50%, Mn: 0.05% to 1.0%, P: 0.04% or less, S: 0.01% or less, Cr: 15.5% to 18.0%, Al: 0.001% to 0.10%, N: 0.01% to 0.06%, and the balance being Fe and unavoidable impurities, wherein the material has a microstructure that includes 10% to 60% of a martensite phase in terms of area fraction, with the remainder being a ferrite phase, and the martensite phase has a hardness of HV500 or less.Type: GrantFiled: January 20, 2015Date of Patent: June 19, 2018Assignee: JFE STEEL CORPORATIONInventors: Masataka Yoshino, Hiroki Ota, Ayako Ta, Yukihiro Matsubara, Akito Mizutani, Mitsuyuki Fujisawa
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Publication number: 20180112285Abstract: The disclosure is to provide a martensitic stainless steel excellent in strength, workability and corrosion resistance. The martensitic stainless steel comprises a chemical composition containing, in mass %: C: 0.020% or more and less than 0.10%, Si: 0.01% or more and 2.0% or less, Mn: 0.01% or more and 3.0% or less, P: 0.050% or less, S: 0.050% or less, Cr: 10.0% or more and 16.0% or less, Ni: 0.01% or more and 0.80% or less, Al: 0.001% or more and 0.50% or less, and N: more than 0.050% and 0.20% or less, satisfying N %?C %, and the balance containing Fe and incidental impurities, where C % and N % indicate respectively the contents of C and N (mass %) in the steel.Type: ApplicationFiled: April 15, 2016Publication date: April 26, 2018Applicant: JFE STEEL CORPORATIONInventors: Tetsuyuki NAKAMURA, Takashi SAMUKAWA, Mitsuyuki FUJISAWA, Chikara KAMI
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Patent number: 9920409Abstract: Provided is stainless steel foil that is suitably used for forming a catalyst carrier for an exhaust gas purifying facility, the catalyst carrier being installed in a vehicle that discharges exhaust gas having a temperature lower than the temperature of exhaust gas of a gasoline-powered automobile. The ferritic stainless steel foil contains, by mass %, C: 0.05% or less, Si: 2.0% or less, Mn: 1.0% or less, S: 0.005% or less, P: 0.05% or less, Cr: 11.0% to 25.0%, Ni: 0.05% to 0.30%, Al: 0.01% to 1.5%, Cu: 0.01% to 2.0%, N: 0.10% or less, and the balance being Fe and inevitable impurities.Type: GrantFiled: January 24, 2013Date of Patent: March 20, 2018Assignee: JFE Steel CorporationInventors: Akito Mizutani, Mitsuyuki Fujisawa, Hiroki Ota, Hiroyuki Ogata
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Publication number: 20170349984Abstract: 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: ApplicationFiled: July 2, 2015Publication date: December 7, 2017Applicant: JFE STEEL CORPORATIONInventors: Akito MIZUTANI, Masataka YOSHINO, Mitsuyuki FUJISAWA, Ayako TA
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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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Publication number: 20170327921Abstract: 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: ApplicationFiled: July 2, 2015Publication date: November 16, 2017Applicant: JFE STEEL CORPORATIONInventors: Akito MIZUTANI, Masataka YOSHINO, Mitsuyuki FUJISAWA, Ayako TA
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Patent number: 9777357Abstract: According to aspects of the invention, provided are an Fe—Cr—Al-based stainless steel sheet which has improved manufacturability by improving the toughness of a hot-rolled steel sheet and a cold-rolled steel sheet without deteriorating oxidation resistance at a high temperature and shape stability when used at a high temperature, and a stainless steel foil which is manufactured by rolling the stainless steel sheet. V and B are added in combination to Fe—Cr—Al-based stainless steel in amounts within specified ranges. Specifically, V content is controlled to be 0.010% or more and 0.050% or less and B content is controlled to be 0.0001% or more and 0.0050% or less, in which the relationship {V content (V %)}/{B content (B %)}>10 is satisfied.Type: GrantFiled: December 5, 2013Date of Patent: October 3, 2017Assignee: JFE Steel CorporationInventors: Akito Mizutani, Mitsuyuki Fujisawa, Hiroki Ota, Hiroyuki Ogata
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Publication number: 20170275725Abstract: Provided are a ferritic stainless steel foil excellent in terms of corrugating workability, shape change resistance at a high temperature, and manufacturability and a method for manufacturing the steel foil. A ferritic stainless steel foil having a chemical composition containing, by mass % , C: 0.020% or less, Si: 2.0% or less, Mn: 1.0% or less, S: 0.010% or less, P: 0.050% or less, Cr: 10.0% or more and 25.0% or less, Ni: 0.05% or more and 0.50% or less, Ti: 0.14% or more and 0.25% or less, Al: 0.001% or more and 0.10% or less, V: 0.02% or more and 0.10% or less, N: 0.020% or less, and the balance being Fe and inevitable impurities, and a Vickers hardness of higher than 200 and lower than 350.Type: ApplicationFiled: August 20, 2015Publication date: September 28, 2017Applicant: JFE Steel CorporationInventors: Akito Mizutani, Mitsuyuki Fujisawa
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Publication number: 20170275722Abstract: Provided is a ferritic stainless steel sheet having excellent corrosion resistance and workability equal to or better than SUH409L. The ferritic stainless steel sheet contains 0.025% or less C, 0.01% to 1.00% Si, 0.05% to 1.00% Mn, 0.020% to 0.040% P, 0.030% or less S, 0.001% to 0.100% Al, 12.5% to 14.4% Cr, 0.01% to 0.80% Ni, 0.11% to 0.40% Ti, 0.010% to 0.100% Nb, and 0.020% or less N by mass %, the remainder being Fe and inevitable impurities.Type: ApplicationFiled: February 27, 2015Publication date: September 28, 2017Applicant: JFE STEEL CORPORATIONInventors: Shuji NISHIDA, Tomohiro ISHII, Tetsuyuki NAKAMURA, Mitsuyuki FUJISAWA, Chikara KAMI
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Publication number: 20170183752Abstract: Provided is a ferritic stainless steel that has excellent corrosion resistance and displays good brazing properties when brazing is carried out at high temperature using a Ni-containing brazing metal. These effects are obtained as a result of the steel having a chemical composition containing, in mass %: 0.003%-0.020% of C; 0.05%-1.00% of Si; 0.10%-0.50% of Mn, 0.04% or less of P; 0.01% or less of S; 16.0%-25.0% of Cr; 0.05%-0.60% of Ni; 0.25%-0.45% of Nb; 0.005%-0.15% of Al; 0.005%-0.030% of N; and at least one selected from 0.50%-2.50% of Mo and 0.05%-0.80% of Cu, the balance being Fe and incidental impurities, and as a result of a nitrogen-enriched layer being created that has a nitrogen concentration peak value of 0.03 to 0.30 mass % at a depth of within 0.05 ?m of a surface of the steel.Type: ApplicationFiled: July 23, 2015Publication date: June 29, 2017Applicant: JFE STEEL CORPORATIONInventors: Kunio FUKUDA, Mitsuyuki FUJISAWA, Tomohiro ISHII, Shin ISHIKAWA, Chikara KAMI
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Patent number: 9624563Abstract: Provided are a stainless steel foil and a catalyst carrier for an exhaust gas purifying device which uses the foil. Specifically, a stainless steel foil contains, in percent by mass, 0.05% or less of C, 2.0% or less of Si, 1.0% or less of Mn, 0.003% or less of S, 0.05% or less of P, more than 15.0% and less than 25.0% of Cr, 0.30% or less of Ni, 3.0% to 10.0% of Al, 0.03% to 1.0% of Cu, 0.10% or less of N, 0.02% or less of Ti, 0.02% or less of Nb, 0.02% or less of Ta, 0.005% to 0.20% of Zr, 0.03% to 0.20% of REM excluding Ce, 0.02% or less of Ce, 2.0% to 6.0% in total of at least one of Mo and W, and the balance being Fe and incidental impurities.Type: GrantFiled: March 28, 2012Date of Patent: April 18, 2017Assignee: JFE Steel CorporationInventors: Akito Mizutani, Mitsuyuki Fujisawa, Hiroki Ota, Yasushi Kato
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Publication number: 20170088912Abstract: Provided is a ferritic stainless steel that has excellent corrosion resistance and displays good brazing properties when brazing is carried out at high temperature using a Ni-containing brazing metal. These effects are obtained as a result of the steel having a chemical composition containing, in mass %: 0.003% to 0.020% of C; 0.05% to 1.00% of Si; 0.10% to 0.50% of Mn, 0.05% or less of P; 0.01% or less of S; 16.0% to 25.0% of Cr; 0.05% to 0.35% of Ti; 0.005% to 0.05% of Al; and 0.005% to 0.025% of N, the balance being Fe and incidental impurities, and as a result of a nitrogen-enriched layer being created that has a nitrogen concentration peak value of 0.05 mass % to 0.30 mass % at a depth of within 0.05 ?m of a surface of the steel.Type: ApplicationFiled: February 25, 2015Publication date: March 30, 2017Applicant: JFE STEEL CORPORATIONInventors: Kunio Fukuda, Mitsuyuki Fujisawa, Akito Mizutani, Tomohiro Ishii, Chikara Kami
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Publication number: 20170029916Abstract: Provided is a ferritic stainless steel foil having an excellent ability to form whiskers is obtained by its composition containing, by mass, C: 0.050% or less, Si: 2.00% or less, Mn: 0.50% or less, S: 0.010% or less, P: 0.050% or less, Cr: 15.0% or more and 30.0% or less, Al: 2.5% or more and 6.5% or less, N: 0.050% or less, one or more elements selected from Ti: 0.01% or more and 0.50% or less, Nb: 0.01% or more and 0.20% or less, V: 0.01% or more and 0.20% or less, Zr: 0.005% or more and 0.200% or less, and Hf: 0.005% or more and 0.200% or less, and the balance being Fe and inevitable impurities, the proportion of a {111} crystal grain (a crystal grain such that the difference between the {111} plane of the crystal grain and a direction perpendicular to the surface of the foil falls within ±15°) on the surface of the foil being 50% by area or more, and the thickness of an oxide layer formed on the surface of the foil being 0.1 ?m or less.Type: ApplicationFiled: February 24, 2015Publication date: February 2, 2017Applicant: JFE STEEL CORPORATIONInventors: Akito Mizutani, Mitsuyuki Fujisawa
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Publication number: 20160369368Abstract: A material for stainless steel cold rolling suitable for producing a cold-rolled stainless steel sheet that has sufficient corrosion resistance and ridging resistance as well as excellent formability and surface properties is provided. The material for stainless steel cold rolling according to the present invention contains, in terms of % by mass, C: 0.007% to 0.05%, Si: 0.02% to 0.50%, Mn: 0.05% to 1.0%, P: 0.04% or less, S: 0.01% or less, Cr: 15.5% to 18.0%, Al: 0.001% to 0.10%, N: 0.01% to 0.06%, and the balance being Fe and unavoidable impurities, wherein the material has a microstructure that includes 10% to 60% of a martensite phase in terms of area fraction, with the remainder being a ferrite phase, and the martensite phase has a hardness of HV500 or less.Type: ApplicationFiled: January 20, 2015Publication date: December 22, 2016Applicant: JFE STEEL CORPORATIONInventors: Masataka Yoshino, Hiroki Ota, Ayako Ta, Yukihiro Matsubara, Akito Mizutani, Mitsuyuki Fujisawa