Patents by Inventor Takuya MITSUNOBU

Takuya MITSUNOBU 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: 10982303
    Abstract: There is provided a coated steel product having a steel product and a coating layer including a Zn—Al—Mg alloy layer disposed on a surface of the steel product, in which the Zn—Al—Mg alloy layer has a Zn phase, the Zn phase contains a Mg—Sn intermetallic compound phase, and the coating layer consists of Zn: more than 65.0%, Al: from more than 5.0% to less than 25.0%, Mg: from more than 3.0% to less than 12.5%, Sn: 0.1% to 20.0% in terms of percent (%) by mass, given amounts of optional elements, and impurities, and has a chemical composition that satisfies the following Formulas 1 to 5: Bi+In<Sn??Formula 1: Y+La+Ce?Ca??Formula 2: Si<Sn??Formula 3: 0?Cr+Ti+Ni+Co+V+Nb+Cu+Mn<0.25??Formula 4: 0?Sr+Sb+Pb+B<0.5.
    Type: Grant
    Filed: January 26, 2018
    Date of Patent: April 20, 2021
    Assignee: NIPPON STEEL CORPORATION
    Inventors: Kohei Tokuda, Jun Maki, Yasuto Goto, Takuya Mitsunobu
  • Publication number: 20210079498
    Abstract: A coated steel sheet including a steel sheet and a coating layer provided on at least part of the surface of the steel sheet, in which the coating layer has a predetermined chemical composition in terms of % by mass, and the coating layer has a granular Mg2Sn phase-containing structure in an area fraction of from 5 to 65%, and a structure containing a solid solution of Zn and Al, and the granular Mg2Sn phase-containing structure is a structure constituted with a Zn phase and a granular Mg2Sn phase having a crystal grain size of less than 1 ?m dispersed in the Zn phase.
    Type: Application
    Filed: March 16, 2018
    Publication date: March 18, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventor: Takuya MITSUNOBU
  • Publication number: 20210039354
    Abstract: There is provided a hot-stamped body including: a steel base metal; and a metallic layer formed on a surface of the steel base metal, wherein the metallic layer includes: an interface layer that contains, in mass %, Al: 30.0 to 36.0%, has a thickness of 100 nm to 5 ?m, and is located in an interface between the metallic layer and the steel base metal; and a principal layer that includes coexisting MgZn2 phases and insular FeAl2 phases, is located on the interface layer, and has a thickness of 3 ?m to 40 ?m.
    Type: Application
    Filed: March 20, 2018
    Publication date: February 11, 2021
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Kohei TOKUDA, Takuya MITSUNOBU, Akihiro SENGOKU, Kenichiro MATSUMURA
  • Publication number: 20210039355
    Abstract: There is provided a hot-stamped body including: a steel base metal; and a metallic layer formed on a surface of the steel base metal, wherein the metallic layer includes: an interface layer that contains, in mass %, Al: 30.0 to 36.0%, has a thickness of 100 nm to 15 ?m, and is located in an interface between the metallic layer and the steel base metal; and a principal layer that includes coexisting Zn phases and insular FeAl2 phases, is located on the interface layer, and has a thickness of 1 ?m to 40 ?m. This hot-stamped body is excellent in fatigue properties, corrosion resistance, and chipping resistance.
    Type: Application
    Filed: March 20, 2018
    Publication date: February 11, 2021
    Applicant: Nippon Steel Corporation
    Inventors: Takuya MITSUNOBU, Kohei TOKUDA, Akihiro SENGOKU, Kenichiro MATSUMURA
  • Patent number: 10844463
    Abstract: A coated steel sheet including a steel sheet and a coating layer provided on at least part of the surface of the steel sheet, in which the coating layer has a predetermined chemical composition in terms of % by mass; in which the coating layer has a laminar Mg2Sn phase-containing structure in an area fraction of from 5 to 65%, and a structure containing a solid solution of Zn and Al; and the laminar Mg2Sn phase-containing structure is a structure constituted with a Zn phase and a laminar Mg2Sn phase having a thickness of less than 1 ?m, and in which the laminar Mg2Sn phase exists dividing the Zn phase into plural regions.
    Type: Grant
    Filed: March 16, 2018
    Date of Patent: November 24, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventor: Takuya Mitsunobu
  • Patent number: 10655203
    Abstract: An average chemical composition of a plating layer (10) and an intermetallic compound layer (30) is represented by, in terms of mass %, Al: 10% to 40%, Si: 0.05% to 4%, Mg: 0% to 5%, and the balance: Zn and impurities. The plating layer (10) includes a first structure (11) constituted from Al phases containing Zn in solid solution and Zn phases dispersed in the Al phases and having an average chemical composition represented by, in terms of mass %, Al: 25% to 50%, Zn: 50% to 75%, and impurities: less than 2%, and a eutectoid structure (14) constituted from Al phases and Zn phases and having an average chemical composition represented by, in terms of mass %, Al: 10% to 24%, Zn: 76% to 90%, and impurities: less than 2%.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: May 19, 2020
    Assignee: NIPPON STEEL CORPORATION
    Inventor: Takuya Mitsunobu
  • Publication number: 20200017937
    Abstract: A coated steel sheet including a steel sheet and a coating layer provided on at least part of the surface of the steel sheet, in which the coating layer has a predetermined chemical composition in terms of % by mass; in which the coating layer has a laminar Mg2Sn phase-containing structure in an area fraction of from 5 to 65%, and a structure containing a solid solution of Zn and Al; and the laminar Mg2Sn phase-containing structure is a structure constituted with a Zn phase and a laminar Mg2Sn phase having a thickness of less than 1 ?m, and in which the laminar Mg2Sn phase exists dividing the Zn phase into plural regions.
    Type: Application
    Filed: March 16, 2018
    Publication date: January 16, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventor: Takuya MITSUNOBU
  • Publication number: 20200002798
    Abstract: Provided is a metallic coated steel product which is less likely to experience LME and blowhole formation and is likely to exhibit an improved corrosion resistance at welding heat affected zones. The metallic coated steel product is a hot-dip metallic coated steel product including a steel product and a plating layer that is provided on a surface of the steel product and includes a Zn—Al—Mg alloy layer. In a cross-section of the Zn—Al—Mg alloy layer an area fraction of MgZn2 phase is from 45 to 75%, a total area fraction of MgZn2 and Al phases is not less than 70%, and an area fraction of Zn—Al—MgZn2 ternary eutectic structure is from 0 to 5%; and the plating layer has a predetermined chemical composition.
    Type: Application
    Filed: January 26, 2018
    Publication date: January 2, 2020
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Kohei TOKUDA, Yoshinari ISHIDA, Takuya MITSUNOBU, Nobuyuki SHIMODA
  • Publication number: 20190390303
    Abstract: There is provided a coated steel product having a steel product and a coating layer including a Zn—Al—Mg alloy layer disposed on a surface of the steel product, in which the Zn—Al—Mg alloy layer has a Zn phase, the Zn phase contains a Mg—Sn intermetallic compound phase, and the coating layer consists of Zn: more than 65.0%, Al: from more than 5.0% to less than 25.0%, Mg: from more than 3.0% to less than 12.5%, Sn: 0.1% to 20.0% in terms of percent (%) by mass, given amounts of optional elements, and impurities, and has a chemical composition that satisfies the following Formulas 1 to 5: Bi+In<Sn??Formula 1: Y+La+Ce?Ca??Formula 2: Si<Sn??Formula 3: 0?Cr+Ti+Ni+Co+V+Nb+Cu+Mn<0.25??Formula 4: 0?Sr+Sb+Pb+B<0.5.
    Type: Application
    Filed: January 26, 2018
    Publication date: December 26, 2019
    Applicant: NIPPON STEEL CORPORATION
    Inventors: Kohei TOKUDA, Jun MAKI, Yasuto GOTO, Takuya MITSUNOBU
  • Publication number: 20180245193
    Abstract: An average chemical composition of a plating layer (10) and an intermetallic compound layer (30) is represented by, in terms of mass %, Al: 10% to 40%, Si: 0.05% to 4%, Mg: 0% to 5%, and the balance: Zn and impurities. The plating layer (10) includes a first structure (11) constituted from Al phases containing Zn in solid solution and Zn phases dispersed in the Al phases and having an average chemical composition represented by, in terms of mass %, Al: 25% to 50%, Zn: 50% to 75%, and impurities: less than 2%, and a eutectoid structure (14) constituted from Al phases and Zn phases and having an average chemical composition represented by, in terms of mass %, Al: 10% to 24%, Zn: 76% to 90%, and impurities: less than 2%.
    Type: Application
    Filed: October 25, 2016
    Publication date: August 30, 2018
    Applicant: NIPPON STEEL & SUMITOMO METAL CORPORATION
    Inventor: Takuya MITSUNOBU