- 专利标题: PLATED STEEL SHEET FOR HOT PRESS FORMING HAVING EXCELLENT IMPACT PROPERTIES AFTER HOT PRESS FORMING, HOT PRESS FORMED MEMBER, AND MANUFACTURING METHODS THEREOF
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申请号: US17311219申请日: 2019-12-19
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公开(公告)号: US20220025479A1公开(公告)日: 2022-01-27
- 发明人: Seong-Woo Kim , Jin-Keun Oh , Sang-Heon Kim , Yeol-Rae Cho
- 申请人: POSCO
- 申请人地址: KR Pohang-si, Gyeongsangbuk-do
- 专利权人: POSCO
- 当前专利权人: POSCO
- 当前专利权人地址: KR Pohang-si, Gyeongsangbuk-do
- 优先权: KR10-2018-0164822 20181219
- 国际申请: PCT/KR2019/018086 WO 20191219
- 主分类号: C21D9/46
- IPC分类号: C21D9/46 ; C21D8/02 ; C22C38/00 ; C22C38/28 ; C22C38/32 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C25D3/22 ; C25D3/44 ; B21D22/02
摘要:
The present invention provides: a plated steel sheet for hot press forming having excellent impact properties after hot press forming; a hot press formed member manufactured using the plated steel sheet for hot press forming; and manufacturing methods thereof. The plated steel sheet comprises: a base steel sheet containing, by weight, 0.15-0.4% of C, 0.1-1% of Si, 0.6-8% of Mn, 0.001-0.05% of P, 0.0001-0.02% of S, 0.01-0.1% of Al, 0.001-0.02% of N, and 0.01-0.5% of Cr, with the remainder comprising Fe and miscellaneous impurities; and a plating layer formed on the surface of the base steel sheet and composed of zinc, aluminum, or an alloy containing zinc and aluminum, wherein the ratio (C S/C B) of the content (C S) of C in a surface layer to the content (C B) of C in the base steel sheet is 0.6 or less, and the ratio ((Mn S+Cr S)/(Mn B+Cr B)) of the total content (Mn S+Cr S) of Mn and Cr in the surface layer to the total content (Mn B+Cr B) of Mn and Cr in the base steel sheet is 0.8 or more.