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    MEMBER FOR AUTOMOBILE STRUCTURE
    4.
    发明申请
    MEMBER FOR AUTOMOBILE STRUCTURE 有权

    公开(公告)号：US20230128371A1

    公开(公告)日：2023-04-27

    申请号：US18077040

    申请日：2022-12-07

    Applicant: Hyundai Steel Company

    Inventor： Hye Jin Kim ,  Kyu Yeon Hwang ,  Jin Ho Lee ,  Hyun Yeong Jung ,  Seung Pill Jung

    IPC: C22C38/28 ,  C23C2/40 ,  C23C2/12 ,  C23C2/28 ,  C22C38/04 ,  C22C38/32 ,  C22C38/00 ,  C22C38/02 ,  C22C38/24 ,  C22C38/26

    Abstract: One embodiment of the present invention discloses a member for automobile structure including a base steel sheet and a plating layer covering at least one surface of the base steel sheet, wherein the member for automobile structure has a tensile strength of 1350 MPa or greater and a yield strength of 900 MPa or greater, wherein the base steel sheet includes a martensite phase having an area fraction of 80% or greater, an iron-based carbide located inside the martensite phase and having an area fraction of less than 5% based on the martensite phase, and precipitates distributed inside the base steel sheet, wherein a mismatch dislocation exists at the interface between iron and the precipitates of the base steel sheet, and a difference between lattice constants of the iron and the precipitates is less than 25% of the lattice constants of the iron.

    High-strength cold-rolled steel sheet with excellent workability and manufacturing method therefor
    7.
    发明授权
    High-strength cold-rolled steel sheet with excellent workability and manufacturing method therefor 有权

    公开(公告)号：US10968498B2

    公开(公告)日：2021-04-06

    申请号：US16311610

    申请日：2017-04-21

    Applicant: Hyundai Steel Company

    Inventor： Hyo Dong Shin ,  Hyun Yeong Jung ,  Sung Yul Huh

    IPC: C21D8/02 ,  C22C38/02 ,  C22C38/06 ,  C22C38/22 ,  C22C38/38 ,  C22C38/60 ,  C22C38/04 ,  C21D9/46

    Abstract: A method for manufacturing a high-strength cold-rolled steel sheet according to an embodiment includes the steps of: reheating a steel slab, which includes 0.10 wt % to 0.13 wt % carbon (C), 0.9 wt % to 1.1 wt % silicon (Si), 2.2 wt % to 2.3 wt % manganese (Mn), 0.35 wt % to 0.45 wt % chromium (Cr), 0.04 wt % to 0.07 wt % molybdenum (Mo), 0.02 wt % to 0.05 wt % antimony (Sb), and the remainder being iron (Fe) and inevitable impurities, at a temperature of 1150° C. to 1250° C.; hot-rolling the reheated slab in such a manner as to reach a finishing mill delivery temperature of 800° C. to 900° C.; cooling the hot-rolled slab to a temperature of 600° C. to 700° C. and coiling the cooled slab, thereby obtaining a hot-rolled steel sheet; pickling the hot-rolled steel sheet, followed by cold rolling; annealing the cold-rolled steel sheet in a two-phase region of α and γ phases; and cooling the annealed steel sheet to the martensite temperature range, followed by overaging.

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