Patents by Inventor Masahiro Fuda
Masahiro Fuda 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: 20240091842Abstract: A plated steel sheet for hot stamping according to one aspect of the present invention includes a steel sheet, a plating layer formed on either surface or both surfaces of the steel sheet and having an Al content of 60 mass % or more, and a surface film layer formed on the plating layer. A thickness t of the plating layer is 10 to 60 ?m. An average crystal grain diameter of the plating layer in a thickness range from an interface between the plating layer and the surface film layer to a position at ? of the thickness t is 2t/3 or less and 15.0 ?m or less. A surface film layer contains particles containing one or more elements selected from A group elements consisting of Sc, V, Mn, Fe, Co, Ce, Nb, Mo, and W. A total content of the A group elements is 0.01 to 10.0 g/m2. An average grain diameter of the particles containing the A group elements is 0.05 to 3.0 ?m.Type: ApplicationFiled: November 29, 2019Publication date: March 21, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Yuki SUZUKI, Soshi FUJITA, Jun MAKI, Kazuhisa KUSUMI, Masahiro FUDA
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Patent number: 11932104Abstract: A fuel tank (10) includes: a lower panel (12) made of steel and an upper panel (11) made of steel; and at least one pillar (100) made of steel which is disposed in an interior space (V) formed by the lower panel (12) and the upper panel (11) facing each other and of which a first end portion is fixed to the lower panel (12) and a second end portion is fixed to the upper panel (11) in a state where the second end portion is disposed in a hole formed in the upper panel (11).Type: GrantFiled: June 12, 2020Date of Patent: March 19, 2024Assignee: NIPPON STEEL CORPORATIONInventors: Toshinori Mizuguchi, Masahiro Fuda, Akiyoshi Inoue, Junji Nakano, Yasuaki Naito
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Publication number: 20240068080Abstract: A hot-stamped product with improved delayed-fracture resistance is provided. The hot-stamped product 1 includes: a steel substrate 10; and an Al film 20 formed on the steel substrate 10, the Al film 20 including: an interface layer 21 located at the interface with the steel substrate 10 and with part of the ?Fe substituted by Al and Si; an intermediate layer 22 formed on the interface layer 21; and an oxide layer formed on the intermediate layer, the intermediate layer 22 including an Fe—Al—Si phase 22a with part of the ?Fe substituted by Al and Si, the Fe—Al—Si phase 22a including one or more elements selected from the group consisting of Zr, Ce, Y, Ta, Ni, Cu, Nb, Cr, Co, V and Ti, the oxide layer 23 including one or more elements selected from the group consisting of Be, Mg, Ca, Sr, Ba, Sc and Zn.Type: ApplicationFiled: March 14, 2022Publication date: February 29, 2024Inventors: Takashi DOI, Kenji KOBAYASHI, Naomi INATOMI, Yuki SUZUKI, Soshi FUJITA, Masahiro FUDA
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Publication number: 20240044012Abstract: To provide a steel sheet for hot stamping suitable for manufacturing, through hot-stamping working, a component having portions with different strengths, and a hot-stamped member having portions with different strengths. A steel sheet for hot stamping according to the present invention includes, on a surface of the steel sheet: a site having a surface-treated film whose emissivity at a wavelength of 8.0 ?m at 25° C. is 60% or more; and a site at which the surface-treated film is not provided, in which the surface-treated film contains carbon black, and one or more of oxides selected from a group consisting of a Zr oxide, a Zn oxide, and a Ti oxide, in which the carbon black and the oxides exist while being dispersed over the entire surface-treated film, the surface-treated film has a silica content of 0 to 0.3 g/m2, and when an adhesion amount of the carbon black and an adhesion amount of the oxides are set to XCB (g/m2) and XOxide (g/m2), respectively, an equation (1) below is satisfied.Type: ApplicationFiled: April 8, 2021Publication date: February 8, 2024Applicant: NIPPON STEEL CORPORATIONInventors: Yuki SUZUKI, Kenta UENISHI, Soshi FUJITA, Masahiro FUDA
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Publication number: 20230166314Abstract: This manufacturing method of a hot press-formed article includes a heating step of heating an Al-plated steel sheet and a forming step of obtaining a hot press-formed article using a die after the heating step, the Al-plated steel sheet has a base steel sheet, an Al plating layer, and a coating layer, the coating layer is a metal layer containing at least one metal of Mg, Ca, V, Ti, and Zn, a metal oxide layer containing an oxide of one or more of Mg, Ca, V, Ti, and Zn, or a mixed layer including the metal layer and the metal oxide layer, the die has a hard layer on a surface, HVDie that is a surface hardness of the die at a position of the hard layer is HV1500 or more and HV3800 or less, and a temperature Tm of the Al-plated steel sheet at a start of forming and an average movement velocity V of the die in the forming step satisfy 800?(HVDie/40)?Tm?850?(V/4)?(HVDie/100).Type: ApplicationFiled: April 20, 2021Publication date: June 1, 2023Applicant: NIPPON STEEL CORPORATIONInventors: Soshi FUJITA, Yuki SUZUKI, Masahiro FUDA, Hideaki IRIKAWA, Masahiro KUBO, Naruhiko NOMURA
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Patent number: 11535916Abstract: An aluminum-based plated steel sheet according to an aspect of the present invention includes: a base material; an aluminum-based plating layer located above the base material; and an intermetallic compound layer that is located between the base material and the aluminum-based plating layer and contains an intermetallic compound of Al and Fe, in which the base material has a chemical component within a predetermined range, the aluminum-based plating layer contains, on average, 80 mass % or more and 97 mass % or less of Al, 3 mass % or more and 15 mass % or less of Si, 0 mass % or more and 5 mass % or less of Zn, 0 mass % or more and 5 mass % or less of Fe, 0 mass % or more and 3 mass % or less in total of one or more selected from the group consisting of Mg and Ca, and impurities so that a total amount thereof is 100 mass %, an average value of a thickness of the intermetallic compound layer is 2 ?m or more and 10 ?m or less, a maximum value of the thickness of the intermetallic compound layer is 10 ?m or morType: GrantFiled: December 5, 2018Date of Patent: December 27, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Soshi Fujita, Yuki Suzuki, Masahiro Fuda, Jun Maki, Hideaki Irikawa, Takashi Aramaki, Tatsuya Kubota
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Publication number: 20220402015Abstract: To solve a problem about warpage of a steel sheet due to a difference in temperature raising rate between an overlapped part and a one-sheet part. This manufacturing method includes: a step of heating an overlapped blank; a step of transferring the heated overlapped blank; and a step of performing presswork on the heated overlapped blank by using a die, in which in the heating step, when sheet thicknesses of the first and second steel sheets are set to t1 and t2, respectively, and an average heating rate at a sheet temperature from 20 to 800° C. of a portion with a total sheet thickness (t1+t2) of an overlapped portion, and that of a non-overlapped portion are set to V and v1, respectively, the total sheet thickness (t1+t2) is 2.5 to 5.Type: ApplicationFiled: February 24, 2021Publication date: December 22, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Soshi FUJITA, Yuki SUZUKI, Masahiro FUDA, Hideaki IRIKAWA, Jun MAKI, Nobuo YOSHIKAWA, Naruhiko NOMURA
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Patent number: 11530474Abstract: Fe-Al-based plated hot-stamped member exhibiting excellent formed part corrosion resistance and post-coating corrosion resistance and manufacturing method. The hot-stamping member includes Fe-Al-based plated layer on one or both surfaces of a base material, the base material has a predetermined steel component, Fe-Al-based plated layer has a thickness of 10 ?m or more and 60 ?m or less, formed by A, B, C and D layers sequentially from a surface toward the base material, and each of the four layers is a Fe-Al-based intermetallic compound containing Al, Fe, Si, Mn and Cr for predetermined contents with the balance made up of impurities, the D layer further contains Kirkendall voids each of which cross-sectional area is 3 ?m2-30 ?m2 for 10 pieces/6000 ?m2 or more and 40 pieces/6000 ?m2 or less.Type: GrantFiled: February 15, 2019Date of Patent: December 20, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Soshi Fujita, Yuki Suzuki, Masahiro Fuda, Jun Maki, Hideaki Irikawa, Tatsuya Kubota
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Publication number: 20220332184Abstract: A fuel tank (10) includes: a lower panel (12) made of steel and an upper panel (11) made of steel; and at least one pillar (100) made of steel which is disposed in an interior space (V) formed by the lower panel (12) and the upper panel (11) facing each other and of which a first end portion is fixed to the lower panel (12) and a second end portion is fixed to the upper panel (11) in a state where the second end portion is disposed in a hole formed in the upper panel (11).Type: ApplicationFiled: June 12, 2020Publication date: October 20, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Toshinori MIZUGUCHI, Masahiro FUDA, Akiyoshi INOUE, Junji NAKANO, Yasuaki NAITO
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Patent number: 11371130Abstract: A hot-dip Sn—Zn-based alloy-plated steel sheet according to an aspect of the present invention includes: a steel sheet having a predetermined chemical composition; a diffusion alloy layer provided on one surface or both surfaces of the steel sheet; and a Sn—Zn-plated layer provided on the diffusion alloy layer, in which the diffusion alloy layer contains Fe, Sn, Zn, Cr, and Ni, an area ratio of a Sn—Fe—Cr—Zn phase to a Sn—Fe—Ni—Zn phase in the diffusion alloy layer is 0.01 or more and less than 2.5, the diffusion alloy layer has a coverage of 98% or more with respect to the one surface, the Sn—Zn-plated layer contains 1% to 20% of Zn by mass % and a remainder consisting of Sn and impurities, and an adhesion amount of the Sn—Zn-plated layer is 10 to 80 g/m2 per one surface.Type: GrantFiled: April 26, 2019Date of Patent: June 28, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Masahiro Fuda, Toshinori Mizuguchi, Junji Nakano, Yoshiharu Inoue, Kazuhisa Kusumi, Yasuaki Naito
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Patent number: 11364707Abstract: To solve the problem about the difference in temperature increasing rate between an overlapped part and a one-sheet part so as to further improve the corrosion resistance of plating after hot stamping.Type: GrantFiled: April 5, 2019Date of Patent: June 21, 2022Assignee: NIPPON STEEL CORPORATIONInventors: Soshi Fujita, Yuki Suzuki, Masahiro Fuda, Jun Maki, Hideaki Irikawa, Masahiro Nakata
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Publication number: 20220025498Abstract: This aluminum-plated steel sheet has a steel sheet and a plating layer formed on a surface of the steel sheet, the plating layer contains one or more A group elements selected from a group consisting of Be, Mg, Ca, Sr, Ba, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn, a remainder of Al, Fe, and impurities, a thickness t of the plating layer is 10 to 60 ?m, and an average grain size is 2t/3 or less and 15 ?m or less in a thickness range from an outermost surface of the plating layer to a ? thickness t position.Type: ApplicationFiled: November 29, 2019Publication date: January 27, 2022Applicant: NIPPON STEEL CORPORATIONInventors: Yuki SUZUKI, Soshi FUJITA, Masahiro FUDA, Hideaki IRIKAWA, Takeshi IMAI, Fumio EIHARA
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Publication number: 20210197525Abstract: To solve the problem about the difference in temperature increasing rate between an overlapped part and a one-sheet part so as to further improve the corrosion resistance of plating after hot stamping.Type: ApplicationFiled: April 5, 2019Publication date: July 1, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Soshi FUJITA, Yuki SUZUKI, Masahiro FUDA, Jun MAKI, Hideaki IRIKAWA, Masahiro NAKATA
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Publication number: 20210164080Abstract: An aluminum-based plated steel sheet according to an aspect of the present invention includes: a base material; an aluminum-based plating layer located above the base material; and an intermetallic compound layer that is located between the base material and the aluminum-based plating layer and contains an intermetallic compound of Al and Fe, in which the base material has a chemical component within a predetermined range, the aluminum-based plating layer contains, on average, 80 mass % or more and 97 mass % or less of Al, 3 mass % or more and 15 mass % or less of Si, 0 mass % or more and 5 mass % or less of Zn, 0 mass % or more and 5 mass % or less of Fe, 0 mass % or more and 3 mass % or less in total of one or more selected from the group consisting of Mg and Ca, and impurities so that a total amount thereof is 100 mass %, an average value of a thickness of the intermetallic compound layer is 2 ?m or more and 10 ?m or less, a maximum value of the thickness of the intermetallic compound layer is 10 ?m or morType: ApplicationFiled: December 5, 2018Publication date: June 3, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Soshi FUJITA, Yuki SUZUKI, Masahiro FUDA, Jun MAKI, Hideaki IRIKAWA, Takashi ARAMAKI, Tatsuya KUBOTA
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Publication number: 20210156017Abstract: A hot-dip Sn—Zn-based alloy-plated steel sheet according to an aspect of the present invention includes: a steel sheet having a predetermined chemical composition; a diffusion alloy layer provided on one surface or both surfaces of the steel sheet; and a Sn—Zn-plated layer provided on the diffusion alloy layer, in which the diffusion alloy layer contains Fe, Sn, Zn, Cr, and Ni, an area ratio of a Sn—Fe—Cr—Zn phase to a Sn—Fe—Ni—Zn phase in the diffusion alloy layer is 0.01 or more and less than 2.5, the diffusion alloy layer has a coverage of 98% or more with respect to the one surface, the Sn—Zn-plated layer contains 1% to 20% of Zn by mass % and a remainder consisting of Sn and impurities, and an adhesion amount of the Sn—Zn-plated layer is 10 to 80 g/m2 per one surface.Type: ApplicationFiled: April 26, 2019Publication date: May 27, 2021Applicant: Nippon Steel CorporationInventors: Masahiro FUDA, Toshinori MIZUGUCHI, Junji NAKANO, Yoshiharu INOUE, Kazuhisa KUSUMI, Yasuaki NAITO
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Publication number: 20210114074Abstract: A method of producing a hot press-formed product includes subjecting an Al-plated steel sheet having a zinc compound layer or a metallic zinc layer, as an outermost layer, provided on an Al plating layer to hot press forming using a die. The die includes a hard layer having a skewness (Rsk), as measured in a direction from the outside of a die hole toward the inside of the die hole, of 1.3 or less and a hardness Hv_Die of HV 2,000 or more, over the entirety of a region of a steel sheet contact surface that is adjacent to a die shoulder portion. The steel sheet contact surface is a surface located outside of the die hole and configured to contact the Al-plated steel sheet that is to be subjected to the hot press forming.Type: ApplicationFiled: April 9, 2019Publication date: April 22, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Masahiro KUBO, Soshi FUJITA, Yoshiaki NAKAZAWA, Hideaki IRIKAWA, Masahiro FUDA
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Publication number: 20210095368Abstract: Fe-Al-based plated hot-stamped member exhibiting excellent formed part corrosion resistance and post-coating corrosion resistance and manufacturing method. The hot-stamping member includes Fe-Al-based plated layer on one or both surfaces of a base material, the base material has a predetermined steel component, Fe-Al-based plated layer has a thickness of 10 ?m or more and 60 ?m or less, formed by A, B, C and D layers sequentially from a surface toward the base material, and each of the four layers is a Fe-Al-based intermetallic compound containing Al, Fe, Si, Mn and Cr for predetermined contents with the balance made up of impurities, the D layer further contains Kirkendall voids each of which cross-sectional area is 3 ?m2-30 ?m2 for 10 pieces/6000 ?m2 or more and 40 pieces/6000 ?m2 or less.Type: ApplicationFiled: February 15, 2019Publication date: April 1, 2021Applicant: NIPPON STEEL CORPORATIONInventors: Soshi FUJITA, Yuki SUZUKI, Masahiro FUDA, Jun MAKI, Hideaki IRIKAWA, Tatsuya KUBOTA
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Patent number: 10738384Abstract: A surface-treated steel sheet for fuel tanks, including a Zn—Ni alloy plating layer on one surface or both surfaces of a steel sheet; and a trivalent chromate covering layer or a chromate-free covering layer on the Zn—Ni alloy plating layer, wherein, in a surface outermost layer of the trivalent chromate covering layer or the chromate-free covering layer, concavities, of which a depth from an arithmetic average height of a cross-sectional curve of the surface outermost layer is more than or equal to 0.1 ?m, exist in a proportion of 50 to 1000 concavities/mm2 and at an area ratio of 20 to 80% to a surface area of the steel sheet.Type: GrantFiled: August 29, 2016Date of Patent: August 11, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Hiromasa Shoji, Taihei Kaneto, Masahiro Fuda, Hironori Sato, Natsuko Sugiura, Yuji Yamaguchi
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Publication number: 20200238357Abstract: Provided is a coated steel sheet including a steel sheet, a first aluminum coating layer provided on a first surface of the steel sheet, a zinc compound layer or a metallic zinc layer provided on a surface of the first aluminum coating layer, and a second aluminum coating layer provided on a second surface of the steel sheet, as an outermost surface of the steel sheet. Further provided are a coated steel sheet coil using this coated steel sheet, and a method of producing a hot-press formed article, as well as an automobile part using a press formed article produced by the method of producing a hot-press formed article.Type: ApplicationFiled: September 28, 2018Publication date: July 30, 2020Applicant: NIPPON STEEL CORPORATIONInventors: Masahiro KUBO, Yoshiaki NAKAZAWA, Toshiya SUZUKI, Naruhiko NOMURA, Soshi FUJITA, Hideaki IRIKAWA, Masahiro FUDA
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Patent number: 10697067Abstract: A steel sheet for a fuel tank according to the present invention includes: a Zn—Ni alloy plated layer placed on one surface or each of both surfaces of a base metal; and a chromate-free chemical conversion coating film which is placed over the Zn—Ni alloy plated layer. The Zn—Ni alloy plated layer has a crack starting from an interface with the chromate-free chemical conversion coating film and reaching an interface with the steel sheet, the chromate-free chemical conversion coating film consists of an organosilicon compound consisting of a condensation polymer of a silane coupling agent, a phosphoric acid compound and/or a phosphonic acid compound, a vanadium compound, and a titanium compound and/or a zirconium compound, and a concentration of a total of amounts in terms of metal, per surface, of the phosphoric acid compound and/or the phosphonic acid compound+the vanadium compound+the titanium compound and/or the zirconium compound, is 5 mass % to 20 mass %.Type: GrantFiled: February 1, 2016Date of Patent: June 30, 2020Assignee: NIPPON STEEL CORPORATIONInventors: Kiyokazu Ishizuka, Noriyuki Maekawa, Hiroaki Uramoto, Masahiro Fuda, Ikuro Yamaoka, Kenichiro Matsumura