Patents by Inventor Soshi Fujita

Soshi Fujita 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).

  • Publication number: 20210095368
    Abstract: 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: Application
    Filed: February 15, 2019
    Publication date: April 1, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Soshi FUJITA, Yuki SUZUKI, Masahiro FUDA, Jun MAKI, Hideaki IRIKAWA, Tatsuya KUBOTA
  • Publication number: 20200347489
    Abstract: An Al plated electric resistance welded steel pipe for hardening use suppressing the formation of scale to the inside of the plating layer while performing hot forming and an Al plated hollow member using that Al plated electric resistance welded steel pipe, wherein the Al plated electric resistance welded steel pipe for hardening use is comprised of a base material made of a tubular steel plate and having a predetermined chemical composition and an electric resistance welded zone provided at a seam portion of the steel plate and extending in a longitudinal direction of the steel plate, the base material is further provided with an intermetallic compound layer positioned on the surface of the steel plate and including an Al-Fe-Si-based intermetallic compound and an Al plating layer positioned on the surface of the intermetallic compound layer and containing Al and Si, and 70×X/D?Y/t?30 is satisfied, wherein X (?m) is a thickness of the intermetallic compound layer, Y (?m) is a thickness of the Al plating laye
    Type: Application
    Filed: November 20, 2017
    Publication date: November 5, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Jun MAKI, Soshi FUJITA, Toyomitsu NAKAMURA
  • Patent number: 10800933
    Abstract: A surface treatment solution for a plated steel sheet to be hot-pressed comprising a ZnO aqueous dispersion (A) and a water dispersible organic resin (B), wherein the ZnO aqueous dispersion (A) comprises water and ZnO particle size having 50 to 300 nm particles, the water dispersible organic resin (B) has a 5 to 45 mgKOH/g acid value and 5 to 300 nm emulsion particle size, and a mass ratio (WA/WB) of a mass of ZnO particles in the ZnO aqueous dispersion (WA) to a mass of solid content of the water dispersible organic resin (WB) is 30/70 to 95/5.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: October 13, 2020
    Assignee: NIHON PARKERIZING CO., LTD.
    Inventors: Soshi Fujita, Jun Maki, Shintaro Yamanaka, Masao Kurosaki, Tatsuya Suzuki, Kensuke Mizuno, Takumi Kozaki, Takahiro Kodama
  • Publication number: 20200271247
    Abstract: This steel sheet includes a first coated portion in which an intermetallic compound layer and an aluminum coating layer are provided on a surface of a base steel sheet in order from the base steel sheet, the first exposed portion in which the base steel sheet is exposed, and a second coated portion in which the intermetallic compound layer and the aluminum coating layer are provided on the surface of the base steel sheet in order from the base steel sheet, in which in a first direction which is perpendicular to a thickness direction of the steel sheet and is directed from the first coated portion to one end edge of the steel sheet, the first coated portion, the first exposed portion, the second coated portion, and the end edge of the steel sheet are disposed in this order on at least one surface of the base steel sheet, and wherein at least the first coated portion, the first exposed portion, and the end edge of the steel sheet are disposed in this order on the other surface of the base steel sheet in the fir
    Type: Application
    Filed: November 8, 2018
    Publication date: August 27, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Hiroki FUJIMOTO, Masanori YASUYAMA, Yujiro TATSUMI, Tasuku ZENIYA, Hiroshi FUKUCHI, Yuki SUZUKI, Soshi FUJITA, Shintaro KOBAYASHI
  • Publication number: 20200238357
    Abstract: 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: Application
    Filed: September 28, 2018
    Publication date: July 30, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Masahiro KUBO, Yoshiaki NAKAZAWA, Toshiya SUZUKI, Naruhiko NOMURA, Soshi FUJITA, Hideaki IRIKAWA, Masahiro FUDA
  • Publication number: 20200232077
    Abstract: A sheet includes: a base; an Al-plating layer on at least one of opposite surfaces of the base; an intermediate coating layer on a surface of the Al-plating layer; and a surface coating layer formed on a surface of the intermediate coating layer and containing ZnO particles with a mean particle size of 0.10 ?m or more and 5.00 ?m or less and an organic resin such that an amount of coating of the ZnO particles is 0.5 g/m2 or more and 10.0 g/m2 or less in terms of metallic zinc.
    Type: Application
    Filed: March 23, 2018
    Publication date: July 23, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Shinichi YAMAGUCHI, Jun MAKI, Soshi FUJITA, Shintaro YAMANAKA, Michiko KONNO, Tetsuya TOBA
  • Patent number: 10711336
    Abstract: Provided is an alloyed hot-dip galvanized steel sheet including a base steel sheet, the base steel sheet containing a given amount of C, Si, Mn, and other elements. The alloyed hot-dip galvanized steel sheet is provided with an alloyed hot-dip galvanized layer on a surface of the base steel sheet, the alloyed hot-dip galvanized layer containing, in mass %, Fe: more than or equal to 5% and less than or equal to 15%, and having a thickness of more than or equal to 3 ?m and less than or equal to 30 ?m.
    Type: Grant
    Filed: November 8, 2018
    Date of Patent: July 14, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Soshi Fujita, Shintaro Yamanaka
  • Publication number: 20200189233
    Abstract: A hot stamped member has a steel, an Al—Fe intermetallic compound layer formed on the steel, and an oxide film layer formed on the Al—Fe intermetallic compound layer, in which the oxide film layer is made up of one or more A group elements selected from the group consisting of Be, Mg, Ca, Sr, Ba, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, and Zn, Al, oxygen, and impurities, a proportion of the A group element in the oxide film layer excluding the oxygen is 0.01 atom % or more and 80 atom % or less, a thickness t of the oxide film layer is 0.1 to 10.0 ?m, and, in the case of measuring the A group element in the oxide film layer in a thickness direction from a surface of the oxide film layer using a GDS, a maximum value of a detection intensity of the A group element in a range from the surface to one-third of the thickness t is 3.0 times or more an average value of detection intensities of the A group element in a range from two thirds of the thickness t to t.
    Type: Application
    Filed: June 1, 2018
    Publication date: June 18, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Yuki SUZUKI, Soshi FUJITA, Jun MAKI, Kazuhisa KUSUMI, Masahiro FUDA, Hideaki IRIKAWA
  • Publication number: 20200024748
    Abstract: Provided are a plated steel sheet for hot stamping including: a plated steel sheet body including a steel sheet and an aluminum plating layer provided on one side or both sides of the steel sheet; and a zinc-based metal soap film provided on a surface of the plated steel sheet body on a side of the aluminum plating layer and having an adhesion amount of from 7.1 to 19.8 g/m2 based on a Zn amount (when, in the plated steel sheet body, a zinc oxide film is on the surface of an aluminum plating layer, the total adhesion amount of the zinc oxide film and the zinc-based metal soap film is from 7.1 to 19.8 g/m2 based on a Zn amount.), and a method of manufacturing such a sheet. Also provided are a method of manufacturing a hot-stamped component using the plated steel sheet for hot stamping, and a method of manufacturing a vehicle using a stamped component manufactured by a method of manufacturing a hot-stamped component.
    Type: Application
    Filed: December 21, 2017
    Publication date: January 23, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Masahiro KUBO, Yoshiaki NAKAZAWA, Toshiya SUZUKI, Narihiko NOMURA, Soshi FUJITA, Hideaki IRIKAWA
  • Patent number: 10526690
    Abstract: A high-strength hot-dip galvanized steel sheet that is a steel sheet that includes major components and that contains at least 40 vol. % the sum of bainite and martensite, 8-60 vol. % retained austenite, and less than 40 vol. % ferrite, with the remainder comprising an incidental structure. The hot-dip galvanized steel sheet has, at the interface between the deposit layer formed by hot-dip galvanization and the base steel sheet, an intermetallic compound constituted of Fe, Al, Zn, and incidental impurities and having an average thickness of 0.1-2 ?m, the intermetallic compound having a crystal grain diameter of 0.01-1 ?m. After the deposit layer formed by hot-dip galvanization was removed, the surface of the base steel sheet has an arithmetic average roughness Ra of 0.1-2.0 ?m and gives a roughness curve in which the contour elements have an average length RSm of 5-300 ?m.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: January 7, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Shintaro Yamanaka, Soshi Fujita, Koichi Sato
  • Publication number: 20190366686
    Abstract: The present invention provides an alloyed Al plated steel sheet for hot stamping, which is a steel sheet having, on the surface, an Al—Fe alloyed layer that includes an A phase (Fe—Al-based alloy phase including 45% to 85% of Fe and 4% to 13% of Si) and has a thickness of 15 ?m or more, in which a proportion of a length occupied by the A phase in an uppermost surface of a cross section perpendicular to the surface of the steel sheet is 10% or more and 50% or less.
    Type: Application
    Filed: February 2, 2017
    Publication date: December 5, 2019
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Masahiro FUDA, Jun MAKI, Soshi FUJITA, Kazuhisa KUSUMI, Shinichiro TABATA
  • Patent number: 10351936
    Abstract: A high-strength hot-dip galvanized steel sheet containing a main component, the steel sheet having at least 40 wt. % of ferrite as a main phase in terms of the volumetric ratio, and 8-60% inclusive of residual austenite, the remaining structure comprising one or more of bainite, martensite, or pearlite. Austenite particles within a range where the average residual stress (sigmaR) thereof satisfies the expression ?400 MPa<=sigmaR<=200 MPa (formula (1)) are present in an amount of 50% or more in the hot-dip galvanized steel sheet. The surface of the steel sheet has a hot-dip galvanized layer containing less than 7 wt. % of Fe, the remainder comprising Zn, Al and inevitable impurities.
    Type: Grant
    Filed: December 12, 2016
    Date of Patent: July 16, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Koichi Sato, Shintaro Yamanaka, Soshi Fujita
  • Publication number: 20190078190
    Abstract: Provided is an alloyed hot-dip galvanized steel sheet including a base steel sheet, the base steel sheet containing a given amount of C, Si, Mn, and other elements. The alloyed hot-dip galvanized steel sheet is provided with an alloyed hot-dip galvanized layer on a surface of the base steel sheet, the alloyed hot-dip galvanized layer containing, in mass %, Fe: more than or equal to 5% and less than or equal to 15%, and having a thickness of more than or equal to 3 ?m and less than or equal to 30 ?m.
    Type: Application
    Filed: November 8, 2018
    Publication date: March 14, 2019
    Applicant: Nippon Steel & Sumitomo Metal Corporation
    Inventors: Soshi Fujita, Shintaro Yamanaka
  • Patent number: 10167541
    Abstract: Provided is an alloyed hot-dip galvanized steel sheet including a base steel sheet, the base steel sheet containing a given amount of C, Si, Mn, and other elements. The alloyed hot-dip galvanized steel sheet is provided with an alloyed hot-dip galvanized layer on a surface of the base steel sheet, the alloyed hot-dip galvanized layer containing, in mass %, Fe: more than or equal to 5% and less than or equal to 15%, and having a thickness of more than or equal to 3 ?m and less than or equal to 30 ?m.
    Type: Grant
    Filed: November 5, 2013
    Date of Patent: January 1, 2019
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Soshi Fujita, Shintaro Yamanaka
  • Patent number: 10131981
    Abstract: The present invention provides a hot-dip galvanized steel sheet that is excellent in plating wettability and plating adhesiveness even when a base steel sheet contains Si and Mn, and a manufacturing method of the same. The hot-dip galvanized steel sheet according to the present invention includes a base steel sheet containing Si, Mn, and other predetermined components, and a hot-dip galvanizing layer formed on at least one surface of the base steel sheet. In the base steel sheet, a value of HA representing average hardness in a surface layer ranging from an interface between the base steel sheet and the hot-dip galvanizing layer to 50 ?m in depth and a value of HB representing average hardness in a deep portion ranging from the interface to greater than 50 ?m in depth satisfy all the following three relational expressions. 50?HA?500??(1) 50?HB?500??(2) 0.5?HA/HB?0.
    Type: Grant
    Filed: August 2, 2013
    Date of Patent: November 20, 2018
    Assignee: NIPPON STEEL AND SUMITOMO METAL CORPORATION
    Inventors: Soshi Fujita, Shintaro Yamanaka
  • Publication number: 20180171164
    Abstract: A surface treatment solution excellent in stability during storage forming a coating for treatment excellent in waterproofness, solvent resistance, and adhesion with a plated steel sheet and able to provide a surface treated steel sheet with hot-pressing lubricity, chemical convertability after hot-pressing, corrosion resistance after coating, and spot weldability, that is, a surface treatment solution for a plated steel sheet to be hot-pressed comprising a ZnO aqueous dispersion (A) and a water dispersible organic resin (B), wherein the ZnO aqueous dispersion (A) comprises water and ZnO particle size having 50 to 300 nm particles, the water dispersible organic resin (B) has a 5 to 45 mgKOH/g acid value and 5 to 300 nm emulsion particle size, and a mass ratio (WA/WB) of a mass of ZnO particles in the ZnO aqueous dispersion (WA) to a mass of solid content of the water dispersible organic resin (WB) is 30/70 to 95/5.
    Type: Application
    Filed: June 3, 2016
    Publication date: June 21, 2018
    Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION, NIHON PARKERIZING CO., LTD.
    Inventors: Soshi FUJITA, Jun MAKI, Shintaro YAMANAKA, Masao KUROSAKI, Tatsuya SUZUKI, Kensuke MIZUNO, Takumi KOZAKI, Takahiro KODAMA
  • Patent number: 9970116
    Abstract: Provided is an Al-plated steel sheet used for hot pressing that has excellent lubricity in hot state, corrosion resistance after paint coating, and spot weldability. An Al-plated steel sheet used for hot pressing includes: a steel sheet; an Al plating layer formed on one surface or both surfaces of the steel sheet; and a surface coating layer formed on the Al plating layer. The surface coating layer contains a zinc compound, and the zinc compound is deposited on the Al-plated steel sheet in an amount of equal to or greater than 0.3 g/m2 and equal to or less than 1.5 g/m2 as an amount of metallic zinc per one surface, and a zinc deposition amount in any continuous 1 mm2 region is 1.5 g/m2 or less.
    Type: Grant
    Filed: December 10, 2014
    Date of Patent: May 15, 2018
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Soshi Fujita, Shintaro Yamanaka, Jun Maki, Hiroki Fujimoto, Hatsuhiko Oikawa, Hideaki Irikawa
  • Patent number: 9752221
    Abstract: A steel sheet which uses steel sheet which contains the easily oxidizable elements Si and Mn as a base material and which is provided with a hot dip galvanized layer which is excellent in plating wettability and plating adhesion and a method of production of the same are provided. A hot dip galvanized steel sheet which is comprised of a steel sheet having a hot dip galvanized layer A on the surface of the steel sheet, characterized by having the following B layer right under the steel sheet surface and in the steel sheet: B layer: Layer which has thickness of 0.001 ?m to 0.5 ?m, which contains, based on mass of the B layer, one or more of Fe, Si, Mn, P, S, and Al oxides in a total of less than 50 mass %, which contains C, Si, Mn, P, S, and Al not in oxides in C: less than 0.05 mass %, Si: less than 0.1 mass %, Mn: less than 0.5 mass %, P: less than 0.001 mass %, S: less than 0.001 mass %, and Al: less than 0.005 mass % and which contains Fe not in oxides in 50 mass % or more.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: September 5, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Soshi Fujita, Shintaro Yamanaka, Koichi Sato
  • Publication number: 20170088922
    Abstract: A high-strength hot-dip galvanized steel sheet containing a main component, the steel sheet having at least 40 wt. % of ferrite as a main phase in terms of the volumetric ratio, and 8-60% inclusive of residual austenite, the remaining structure comprising one or more of bainite, martensite, or pearlite. Austenite particles within a range where the average residual stress (sigmaR) thereof satisfies the expression ?400 MPa<=sigmaR<=200 MPa (formula (1)) are present in an amount of 50% or more in the hot-dip galvanized steel sheet. The surface of the steel sheet has a hot-dip galvanized layer containing less than 7 wt. % of Fe, the remainder comprising Zn, Al and inevitable impurities.
    Type: Application
    Filed: December 12, 2016
    Publication date: March 30, 2017
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Koichi SATO, Shintaro YAMANAKA, Soshi FUJITA
  • Patent number: 9551055
    Abstract: A high-strength hot-dip galvanized steel sheet containing a main component, the steel sheet having at least 40 wt. % of ferrite as a main phase in terms of the volumetric ratio, and 8-60% inclusive of residual austenite, the remaining structure comprising one or more of bainite, martensite, or pearlite. Austenite particles within a range where the average residual stress (sigmaR) thereof satisfies the expression ?400 MPa<=sigmaR<=200 MPa (formula (1)) are present in an amount of 50% or more in the hot-dip galvanized steel sheet. The surface of the steel sheet has a hot-dip galvanized layer containing less than 7 wt. % of Fe, the remainder comprising Zn, Al and inevitable impurities.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: January 24, 2017
    Assignee: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventors: Koichi Sato, Shintaro Yamanaka, Soshi Fujita