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    METHOD AND APPARATUS FOR PRODUCING OUTER PANEL HAVING CHARACTER LINE
    3.
    发明申请
    METHOD AND APPARATUS FOR PRODUCING OUTER PANEL HAVING CHARACTER LINE 有权

    公开(公告)号：US20210220897A1

    公开(公告)日：2021-07-22

    申请号：US16755504

    申请日：2017-12-25

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Yasunori SAWA ,  Masahiro SAITO ,  Shigeru YONEMURA ,  Akira EGAMI ,  Kohki NAKAMURA

    IPC: B21D28/26 ,  B21D53/88

    Abstract: In a method for producing an outer panel having a character line, a punch includes a projecting portion for forming a bent surface of the character line at a punch top portion, and a punch shoulder R portion. A contact pressure applied to a blank by at least one of the projecting portion and the punch shoulder R portion is higher than a contact pressure applied to the blank by a remaining portion of the punch which excludes the projecting portion and the punch shoulder R portion. A static friction coefficient of a first portion of the punch which includes at least one of the projecting portion and the punch shoulder R portion with respect to the blank is larger than a static friction coefficient of a second portion of the punch which excludes the first portion with respect to the blank.

    PANEL
    5.
    发明申请
    PANEL 有权

    公开(公告)号：US20230050487A1

    公开(公告)日：2023-02-16

    申请号：US17791424

    申请日：2021-01-22

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Mai NAGANO ,  Yasunori SAWA ,  Shigeru YONEMURA

    IPC: C22C38/00 ,  C21D9/46 ,  C21D8/02

    Abstract: A panel that is excellent in both appearance and dent resistance after being formed from a starting material is provided. The panel has a steel sheet including martensite, and a surface roughness parameter (Sa) at a flat part of a center-side portion of the panel is Sa≤0.500 μm. In laths of the martensite, the panel has precipitates having a major axis of 0.05 μm to 1.00 μm and an aspect ratio of 3 or more in an amount of 15 precipitates/μm2 or more. A ratio YS1/YS2 between a yield stress YS1 measured in a tensile test specimen cut out from the flat part of the center-side portion of the panel and a yield stress YS2 measured in a tensile test specimen cut out from an end part of the panel is 0.90 to 1.10.

    HOT ROLLED STEEL SHEET, STEEL FORGED PART AND PRODUCTION METHOD THEREFOR
    6.
    发明申请
    HOT ROLLED STEEL SHEET, STEEL FORGED PART AND PRODUCTION METHOD THEREFOR 有权

    公开(公告)号：US20210095363A1

    公开(公告)日：2021-04-01

    申请号：US16499706

    申请日：2017-03-31

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Tatsuo YOKOI ,  Nobuo YOSHIKAWA ,  Shigeru YONEMURA ,  Kazuya OOTSUKA

    IPC: C22C38/58 ,  C22C38/44 ,  C22C38/42 ,  C22C38/54 ,  C22C38/46 ,  C22C38/48 ,  C22C38/50 ,  C21D8/02 ,  C21D8/00 ,  C22C38/00

    Abstract: A hot rolled steel sheet having a chemical composition consisting of, in mass %, C: 0.020-0.070%, Si: 0.05-1.70%, Mn: 0.60-2.50%, Al: 0.010-1.000%, N: >0-0.0030%, P≤0.050%, S≤0.005%, Ti: 0.015-0.170%, Nb: 0-0.100%, V: 0-0.300%, Cu: 0-2.00%, Ni: 0-2.00%, Cr: 0-2.00%, Mo: 0-1.00%, B: 0-0.0100%, Mg: 0-0.0100%, Ca: 0-0.0100%, REM: 0-0.1000%, Zr: 0-1.000%, Co: 0-1.000%, Zn: 0-1.000%, W: 0-1.000%, Sn: 0-0.050%, the balance: Fe and impurities, a metal microstructure includes, in area %, ferrite: 5-70%, bainite: 30-95%, retained γ≤2%, martensite≤2%, pearlite≤1%, ferrite+bainite≥95%, a number density of the precipitates in ferrite grains is 1.0×1016−50.0×1016/cm3, an average circle-equivalent diameter of the TiN precipitates in the steel sheet is 1.0-10.0 μm, an average of minimum distances between adjacent TiN precipitates is 10.0 μm or more, and a standard deviation of nano hardness is 1.00 GPa or less.

    SHEARING METHOD, SHEARING DEVICE, AND SHEARING FACILITY
    7.
    发明申请
    SHEARING METHOD, SHEARING DEVICE, AND SHEARING FACILITY 审中-公开

    公开(公告)号：US20200030868A1

    公开(公告)日：2020-01-30

    申请号：US16498364

    申请日：2018-03-20

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Takashi YASUTOMI ,  Shigeru YONEMURA ,  Tohru YOSHIDA

    IPC: B21D28/34

    Abstract: A shearing method of a plate-shaped workpiece for applying a shear force in a thickness direction of the plate-shaped workpiece includes: a step for starting applying the shear force on the workpiece with a clearance between action points in a surface direction orthogonal to the thickness direction of the workpiece; a step for applying the shear force after the start of applying the shear force until a fractured surface is created in the workpiece; and a step for increasing the clearance depending on a deformation of the workpiece in the thickness direction after starting applying the shear force until the fractured surface is created in the workpiece.

    HOT ROLLED STEEL SHEET, STEEL FORGED PART AND PRODUCTION METHOD THEREFOR
    8.
    发明申请
    HOT ROLLED STEEL SHEET, STEEL FORGED PART AND PRODUCTION METHOD THEREFOR 审中-公开

    公开(公告)号：US20200024679A1

    公开(公告)日：2020-01-23

    申请号：US16485360

    申请日：2017-03-31

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Tatsuo YOKOI ,  Nobuo YOSHIKAWA ,  Shigeru YONEMURA ,  Kazuya OOTSUKA

    IPC: C21D1/02 ,  C22C38/00 ,  C22C38/04 ,  C22C38/02 ,  C22C38/06 ,  C22C38/08 ,  C22C38/12 ,  C22C38/14 ,  C22C38/16 ,  C22C38/32 ,  C21D8/00 ,  C21D8/02

    Abstract: A hot rolled steel sheet having a chemical composition consisting of, in mass %, C: 0.020-0.070%, Si: 0.05-1.70%, Mn: 0.60-2.50%, Al: 0.005-0.020%, N: >0.0030-0.0060%, P≤0.050%, S≤0.005%, Ti: 0.015-0.170%, Nb: 0-0.100%, V: 0-0.300%, Cu: 0-2.00%, Ni: 0-2.00%, Cr: 0-2.00%, Mo: 0-1.00%, B: 0-0.0100%, Ca: 0-0.0100%, Mg: 0-0.0100%, REM: 0-0.1000%, Zr: 0-1.000%, Co: 0-1.000%, Zn: 0-1.000%, W: 0-1.000%, Sn: 0-0.050%, the balance: Fe and impurities, wherein Ca+Mg+REM≥0.0005, a metal microstructure includes, in area %, ferrite: 5-70%, bainite: 30-95%, retained γ≤2%, martensite ≤2%, pearlite ≤1%, ferrite+bainite≥95%, a number density of the precipitates in ferrite grains is 1.0×1016-50.0×1016/cm3, an average circle-equivalent diameter of the TiN precipitates in the steel sheet is 1.0-10.0 μm, an average of minimum distances between adjacent TiN precipitates is 10.0 μm or more, and a standard deviation of nano hardness is 1.00 GPa or less.

    STRUCTURAL MEMBER, STRUCTURAL MEMBER MANUFACTURING METHOD, AND STRUCTURAL MEMBER MANUFACTURING DEVICE
    9.
    发明申请
    STRUCTURAL MEMBER, STRUCTURAL MEMBER MANUFACTURING METHOD, AND STRUCTURAL MEMBER MANUFACTURING DEVICE 有权

    公开(公告)号：US20220331855A1

    公开(公告)日：2022-10-20

    申请号：US17762806

    申请日：2020-09-25

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Satoshi SHIRAKAMI ,  Yasuharu TANAKA ,  Koichi SATO ,  Shigeru YONEMURA ,  Tohru YOSHIDA

    IPC: B21D47/00 ,  B21D22/26 ,  B21D37/08 ,  B21D22/22

    Abstract: This structural member (W1) is manufactured using a structural member manufacturing device including: a first clamping part (10) having a first lower clamping member (11) and a second upper clamping member (12) disposed to face each other and capable of being opened and closed; a second clamping part (20) having a third lower clamping member (21) and a fourth upper clamping member (22) disposed to face each other corresponding to the first lower clamping member (11) and the second upper clamping member (12) and capable of being opened and closed; and clamping part driving means for allowing the first clamping part (10) and the second clamping part (20) to be relatively separated from each other while causing a position in an X-axis direction and a position in a Z-axis direction to correspond to each other. That is, the structural member (W1) is manufactured by a structural member manufacturing method in which the first clamping part (10) and the second clamping part (20) are relatively separated from each other by the clamping part driving means.

    HOT ROLLED STEEL SHEET
    10.
    发明申请
    HOT ROLLED STEEL SHEET 审中-公开

    公开(公告)号：US20200024683A1

    公开(公告)日：2020-01-23

    申请号：US16499181

    申请日：2017-03-31

    Applicant: NIPPON STEEL CORPORATION

    Inventor： Tatsuo YOKOI ,  Nobuo YOSHIKAWA ,  Shigeru YONEMURA ,  Kazuya OOTSUKA

    IPC: C21D9/46 ,  C22C38/18 ,  C22C38/16 ,  C22C38/14 ,  C22C38/12 ,  C22C38/10 ,  C22C38/08 ,  C22C38/06 ,  C22C38/04 ,  C22C38/02 ,  C22C38/00 ,  C21D8/02 ,  C21D6/00

    Abstract: A hot rolled steel sheet including a chemical composition consisting of, in mass %, C: 0.07-0.22%, Si: 1.00-3.20%, Mn: 0.80-2.20%, Al: 0.010-1.000%, N≤0.0060%, P≤0.050%, S≤0.005%, Ti: 0-0.150%, Nb: 0-0.100%, V: 0-0.300%, Cu: 0-2.00%, Ni: 0-2.00%, Cr: 0-2.00%, Mo: 0-1.00%, B: 0-0.0100%, Mg: 0-0.0100%, Ca: 0-0.0100%, REM: 0-0.1000%, Zr: 0-1.000%, Co: 0-1.000%, Zn: 0-1.000%, W: 0-1.000%, Sn: 0-0.050%, the balance: Fe and impurities, wherein a metal microstructure includes, in area %, at a position ¼ W or ¾ W from an end face of the steel sheet and ¼ t or ¾ t from a surface, retained austenite: more than 2%-10%, martensite ≤2%, bainite: 10-70%, pearlite ≤2%, the balance: ferrite, an average circle-equivalent diameter of a metallic phase constituted of retained austenite/martensite is 1.0 to 5.0 μm, an average of minimum distances between adjacent metallic phases is 3 μm or more, and a standard deviation of nano hardness is 2.5 GPa or less.

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