Invention Publication
- Patent Title: CLAD STEEL PLATE, MEMBER, AND PRODUCTION METHODS FOR SAME
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Application No.: US18549921Application Date: 2022-02-28
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Publication No.: US20240150876A1Publication Date: 2024-05-09
- Inventor: Yoshiyasu KAWASAKI , Yuki TOJI , Tatsuya NAKAGAITO , Shinya YAMAGUCHI , Masayasu UENO , Katsutoshi TAKASHIMA , Tomohiro ONO
- Applicant: JFE STEEL CORPORATION
- Applicant Address: JP Chiyoda-ku, Tokyo
- Assignee: JFE STEEL CORPORATION
- Current Assignee: JFE STEEL CORPORATION
- Current Assignee Address: JP Chiyoda-ku, Tokyo
- Priority: JP 21061923 2021.03.31
- International Application: PCT/JP2022/008472 2022.02.28
- Date entered country: 2023-09-11
- Main IPC: C22C38/04
- IPC: C22C38/04 ; C21D3/06 ; C21D6/00 ; C21D8/02 ; C21D9/46 ; C22C38/02 ; C22C38/06 ; C23C2/06 ; C23C2/28

Abstract:
A clad steel plate having tensile strength (TS) of 780 MPa or more, excellent bendability, collision resistance, and LME resistance. The clad steel plate having a base metal and a cladding metal on front and back surfaces of the base metal, and the chemical composition and microstructure of the base metal and the cladding metal being appropriately controlled so that the average Vickers hardness (HVL) of the cladding metal is 260 or less, the average Vickers hardness (HVL) of the cladding metal divided by the average Vickers hardness (HVB) of the base metal is 0.80 or less, the boundary roughness between the base metal and the cladding metal is 50 μm or less at the maximum height Ry, and the number of voids at the boundary between the base metal and the cladding metal is controlled to 20 or fewer per 10 mm length of the boundary.
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