- 专利标题: Cold-rolled steel plate for hot forming, having excellent corrosion-resistance and spot-weldability, hot-formed member, and method for manufacturing same
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申请号: US17885860申请日: 2022-08-11
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公开(公告)号: US11624100B2公开(公告)日: 2023-04-11
- 发明人: Jin-Keun Oh , Yeol-Rae Cho , A-Ra Cho , Jin-Ho Cha , Si-Myoung Heo , Jeong-Won Seo , Seong-Woo Kim
- 申请人: POSCO
- 申请人地址: KR Pohang-si
- 专利权人: POSCO
- 当前专利权人: POSCO
- 当前专利权人地址: KR Pohang-si
- 代理机构: Morgan, Lewis & Bockius LLP
- 优先权: KR10-2016-0123273 20160926
- 主分类号: C21D9/46
- IPC分类号: C21D9/46 ; B21B3/02 ; B21D22/02 ; C21D6/00 ; C21D8/02 ; C22C38/00 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/20 ; C22C38/22 ; C22C38/24 ; C22C38/26 ; C22C38/50 ; C22C38/54
摘要:
An aspect of the present invention relates to a cold-rolled steel plate for hot forming, which is excellent in corrosion-resistance and spot-weldability, contains, by weight %, C: 0.1-0.4%, Si: 0.5-2.0%, Mn: 0.01-4.0%, Al: 0.001-0.4%, P: 0.001-0.05%, S: 0.0001-0.02%, Cr: 0.5% to less than 3.0%, N: 0.001-0.02%, and a balance of Fe and inevitable impurities, satisfying formula (1) below, and includes an Si amorphous oxidation layer continuously or discontinuously formed at a thickness of 1 nm-100 nm on the surface thereof. Formula (1): 1.4≤0.4*Cr+Si≤3.2 (wherein element symbols denote measurements of respective element contents by weight %).