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    HOT STAMPED MEMBER
    3.
    发明公开
    HOT STAMPED MEMBER 审中-公开

    公开(公告)号：US20240001423A1

    公开(公告)日：2024-01-04

    申请号：US18252541

    申请日：2022-01-14

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Takuya MITSUNOBU ,  Hiroshi TAKEBAYASHI ,  Takehiro TAKAHASHI

    IPC: B21D22/02 ,  C23C2/04 ,  C22C38/00 ,  C22C38/02 ,  C22C30/06

    CPC classification number: B21D22/022 ,  C23C2/04 ,  C22C38/002 ,  C22C38/02 ,  C22C30/06

    Abstract: This hot stamped member includes: a steel; and a plating layer formed on the steel, in which the plating layer has a predetermined chemical composition, the plating layer contains a Zn-based oxide including one or two of a Zn oxide and a Zn—Mg oxide having a size of 1.0 μm or more and 10.0 μm or less in a thickness direction of the plating layer and 0.1 μm or more in a direction perpendicular to the thickness direction, and in a cross section of the plating layer in the thickness direction, when a length of an interface between the plating layer and the steel is indicated as Le, a sum of lengths of the Zn-based oxide projected onto the interface from an upper surface of the plating layer is indicated as ΣLi, and a sum of lengths of portions of the Zn-based oxide in contact with the plating layer projected onto the interface from the upper surface of the plating layer is indicated as ΣLai, ΣLi/Le≥0.10 and ΣLai/ΣLi≥0.50 are satisfied.

    WELDED JOINT AND AUTOMOBILE MEMBER
    4.
    发明公开
    WELDED JOINT AND AUTOMOBILE MEMBER 审中-公开

    公开(公告)号：US20240084833A1

    公开(公告)日：2024-03-14

    申请号：US18271402

    申请日：2021-12-24

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Takuya MITSUNOBU ,  Hiroshi TAKEBAYASHI ,  Takehiro TAKAHASHI

    IPC: F16B5/08 ,  B23K11/11 ,  B62D27/02

    CPC classification number: F16B5/08 ,  B23K11/11 ,  B62D27/02 ,  B62D29/00

    Abstract: The present disclosure inhibits liquid metal embrittlement (LME) cracking and improves corrosion resistance in a welded joint obtained by spot welding a first steel sheet and a second steel sheet. In the welded joint of the present disclosure, a first plating layer is provided on a surface of the first steel sheet facing the second steel sheet, no plating layer is present on or a second plating layer is provided on a surface of the second steel sheet facing the first steel sheet, a boundary plating layer is provided between the first steel sheet and the second steel sheet in a range of 0.5 mm from an end part of the corona bond of the spot welded part toward an outside of the spot welded part, and a Zn penetrated part is present at least at one of the first steel sheet and the second steel sheet adjoining the boundary plating layer. The Zn penetrated part advances from the boundary plating layer along the steel grain boundary, an Mg concentration at a front end of the Zn penetrated part at a location where a Zn concentration is 0.1 mass % is 0.20 mass % or less, and the first plating layer and the second plating layer satisfy a predetermined Relation I.

    HOT STAMPED BODY
    7.
    发明申请
    HOT STAMPED BODY 有权

    公开(公告)号：US20220213607A1

    公开(公告)日：2022-07-07

    申请号：US17606974

    申请日：2020-05-29

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Akinobu KOBAYASHI ,  Takehiro TAKAHASHI ,  Yasuaki KAWAMURA

    IPC: C25D3/12 ,  B21D22/02 ,  C25D3/56 ,  C25D5/36

    Abstract: The present invention relates to a hot stamped body comprising a steel sheet and a plating layer formed on at least one surface of the steel sheet, wherein the plating layer is comprised of a. ZnO region present on a surface side of the plating layer and having an oxygen concentration of 10 mass % or more and an Ni—Fe—Zn alloy region present on a steel sheet side of the plating layer and having an oxygen concentration of less than 10 mass %, and an average concentration of a total of Fe, Mn and Si in the ZnO region is more than 0 mass % and less than 5 mass %.

    SURFACE-TREATED STEEL SHEET FOR BATTERY CONTAINERS AND MANUFACTURING METHOD OF SURFACE-TREATED STEEL SHEET FOR BATTERY CONTAINERS
    9.
    发明申请
    SURFACE-TREATED STEEL SHEET FOR BATTERY CONTAINERS AND MANUFACTURING METHOD OF SURFACE-TREATED STEEL SHEET FOR BATTERY CONTAINERS 有权

    公开(公告)号：US20210025071A1

    公开(公告)日：2021-01-28

    申请号：US16968087

    申请日：2019-02-06

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Mamoru SAITO ,  Takehiro TAKAHASHI ,  Kiyokazu ISHIZUKA

    IPC: C25D5/12 ,  B32B15/01 ,  C25D5/50 ,  C25D7/00 ,  H01M2/02 ,  C22C19/03

    Abstract: To provide a surface-treated steel sheet for battery containers excellent in workability while maintaining battery characteristics and liquid leakage resistance, and a manufacturing method thereof. A surface-treated steel sheet for battery containers according to the present invention includes a Ni—Co—Fe-based diffusion alloy plating layer on at least one surface of a base steel sheet, in which the diffusion alloy plating layer is consisted of a Ni—Fe alloy layer and a Ni—Co—Fe alloy layer, which are arranged sequentially from the base steel sheet side, the diffusion alloy plating layer has a Ni coating weight within a range of 3.0 g/m2 or more and less than 8.74 g/m2 and a Co coating weight within a range of 0.26 g/m2 or more and 1.6 g/m2 or less, with a total of the Ni coating weight and the Co coating weight being less than 9.0 g/m2, when a surface of the diffusion alloy plating layer is analyzed by an X-ray photoelectron spectroscopy, Co: 19.5 to 60%, Fe: 0.5 to 30%, and Co+Fe: 20 to 70% in atom % are satisfied, and a thickness of the Ni—Fe alloy layer is within a range of 0.3 to 1.3 μm.

    WELDED MEMBER
    10.
    发明公开
    WELDED MEMBER 审中-公开

    公开(公告)号：US20240326381A1

    公开(公告)日：2024-10-03

    申请号：US18702221

    申请日：2022-11-11

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Misaki ASADA ,  Hiroki FUJIMOTO ,  Takehiro TAKAHASHI

    IPC: B32B15/01 ,  B23K9/23 ,  B23K26/00 ,  B23K103/04 ,  B23K103/08 ,  C25D3/12

    CPC classification number: B32B15/015 ,  B23K9/23 ,  B23K26/0006 ,  B23K2103/04 ,  B23K2103/08 ,  C25D3/12

    Abstract: To obtain a welded member using a steel sheet less expensive than a pure Ni sheet as a raw material and excellent in corrosion resistance. A welded member according to the present invention is made by connecting a Ni plated steel sheet having a Ni plating layer and a Fe—Ni diffusion alloy layer and another steel sheet via a welded part, wherein: a Ni concentration is 70 mass % or more and a Fe concentration is 30 mass % or less in a surface layer of each of a toe, a toe near area, and the welded part; and a thickness of the Fe—Ni diffusion alloy layer is 0.5 to 1.5 μm and a total thickness of the Ni plating layer and the Fe—Ni diffusion alloy layer is 2.7 to 14.0 μm at a non-welded part, and a total concentration of S and C in the Ni plating layer at the non-welded part is less than 20 ppm.

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