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    WELDED JOINT
    1.
    发明申请
    WELDED JOINT 有权

    公开(公告)号：US20250075291A1

    公开(公告)日：2025-03-06

    申请号：US18727020

    申请日：2022-12-21

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Takuya MITSUNOBU ,  Hiroshi TAKEBAYASHI

    IPC: C22C18/04 ,  B32B7/05 ,  B32B15/01 ,  F16B5/08

    Abstract: Provided is a welded joint comprising a plurality of steel sheets stacked together, a spot weld having a nugget joining the plurality of steel sheets, and a pressure weld and heat affected zone formed around the nugget, and a separation part positioned around the pressure weld, wherein one or more of the plurality of steel sheets is a plated steel sheet comprising a base steel sheet and a plating layer formed on at least a surface corresponding to a stacking surface of the plurality of steel sheets of surfaces of the base steel sheet, the plating layer at the separation part at an outside of the heat affected zone has a predetermined chemical composition, and at the plating layer of the separation part of a region up to 500 m from an end of the pressure weld, a ratio of an area ratio of an η phase with respect to a total of area ratios of the η phase and Γ phase is 10 to 100%.

    STEEL SHEET AND PLATED STEEL SHEET
    3.
    发明公开
    STEEL SHEET AND PLATED STEEL SHEET 审中-公开

    公开(公告)号：US20240117476A1

    公开(公告)日：2024-04-11

    申请号：US18274970

    申请日：2022-03-14

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Masaaki URANAKA ,  Takuya MITSUNOBU ,  Keitaro MATSUDA ,  Hiroshi TAKEBAYASHI ,  Jun MAKI

    IPC: C22C38/06 ,  C22C38/02 ,  C22C38/04 ,  C23C2/06

    CPC classification number: C22C38/06 ,  C22C38/02 ,  C22C38/04 ,  C23C2/06

    Abstract: High strength steel sheet and plated steel sheet having high plateability, LME resistance, and hydrogen embrittlement resistance, that is, steel sheet containing C: 0.05 to 0.40%, Si: 0.2 to 3.0%, Mn: 0.1 to 5.0%, and sol. Al: 0.4 to 1.50%, having an internal oxidation layer including fine granular oxides in a surface layer of the steel sheet, a number density of fine granular oxides in the internal oxidation layer being 4.0/μm2 or more, and including a surface depleted layer with a steel composition not including oxides which satisfies, by mass %, Si≤0.6% and Al≥0.05% at a depth of ½ of the average depth of the internal oxidation layer calculated from the cross-sectional SEM image of the steel sheet, and a plated steel sheet using the same.

    COATED STEEL PRODUCT
    4.
    发明申请
    COATED STEEL PRODUCT 有权

    公开(公告)号：US20220356547A1

    公开(公告)日：2022-11-10

    申请号：US17619268

    申请日：2020-04-16

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Kohei TOKUDA ,  Mamoru SAITO ,  Jun MAKI ,  Takuya MITSUNOBU ,  Yasuto GOTO

    IPC: C22C18/04 ,  B32B15/01 ,  C23C2/06 ,  C23C2/40

    Abstract: A hot-dip coated steel product including: 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 includes a Zn phase, an Al phase, and a MgZn2 phase, and contains a Mg—Sn intermetallic compound phase in the Zn phase, and the coating layer has a chemical composition satisfying a predetermined average composition, a total area proportion of the Al phase and the MgZn2 phase is 70% or more, an area proportion of the Zn phase is 30% or less, an average value of cumulative circumferential lengths of the Al phase is less than 88 mm/mm2, and a total frequency in number of the Al phase having a circumferential length of 50 μm or more is less than 100.

    PLATED STEEL SHEET
    6.
    发明申请
    PLATED STEEL SHEET 有权

    公开(公告)号：US20220119921A1

    公开(公告)日：2022-04-21

    申请号：US17427544

    申请日：2020-04-16

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Takuya MITSUNOBU ,  Jun MAKI ,  Hiroshi TAKEBAYASHI ,  Takehiro TAKAHASHI ,  Kohei TOKUDA

    IPC: C22C18/04 ,  C22C38/02 ,  C23C2/28 ,  C23C2/06 ,  B32B15/01 ,  C22C38/04 ,  C23C2/40

    Abstract: A plated steel sheet having excellent chemical convertibility includes: a steel; and a plating layer that is provided on a surface of the steel, in which the plating layer includes, by mass %, Al: 5.00% to 35.00%, Mg: 2.50% to 13.00%, Fe: 5.00% to 35.00%, Si: 0% to 2.00%, Ca: 0.03% to 2.00%, and a remainder consisting of Zn and impurities, and in a surface of the plating layer, the area fraction of a Fe—Al phase is 0% to 30%, the area fraction of a rod-like lamellar structure of Zn and MgZn2 is 5% to 90%, the area fraction of a massive MgZn2 phase is 10% to 70%, and the area fraction of a remainder is 10% or less.

    WELDED JOINT
    7.
    发明申请
    WELDED JOINT 有权

    公开(公告)号：US20250035139A1

    公开(公告)日：2025-01-30

    申请号：US18716435

    申请日：2023-01-26

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Masaaki URANAKA ,  Takuya MITSUNOBU ,  Masahiro MATSUBA ,  Toyomitsu NAKAMURA

    IPC: F16B5/08

    Abstract: To further improve corrosion resistance in the vicinity of a toe.
    A welded joint according to the present invention includes: a first steel sheet and a second steel sheet; and a weld bead zone formed by arc welding or laser welding, wherein at least one of the first steel sheet or the second steel sheet has a plating layer formed by a predetermined component and an oxide layer located on the plating layer in a non-heat-affected zone, and in a region from a position orthogonal to an extension direction of the weld bead zone from the toe and 1 mm in a direction separating from the toe to a position orthogonal to the extension direction from the toe and 2 mm in the direction separating from the toe, the plating layer has at least one of a η-Zn phase, MgZn2 phase, Mg2Zn3 phase, or MgZn phase as a metal Zn-containing phase having a circle-equivalent diameter of 0.5 μm or more, and when each of the metal Zn-containing phases is projected onto an interface between a base iron and the plating layer, a total sum of lengths of the metal Zn-containing phases in the direction orthogonal to the extension direction, Lt, is 10% or more of a length of the interface, Le.

    WELDED JOINT AND AUTOMOBILE MEMBER
    9.
    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.

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