- 专利标题: HIGH STRENGTH HOT-ROLLED STEEL & METHOD FOR MANUFACTURING HIGH STRENGTH HOT-ROLLED STEEL
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申请号: PCT/EP2018/082620申请日: 2018-11-27
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公开(公告)号: WO2019110359A1公开(公告)日: 2019-06-13
- 发明人: NYMAN, Erik
- 申请人: SSAB TECHNOLOGY AB
- 申请人地址: P.O. Box 70 101 21 Stockholm SE
- 专利权人: SSAB TECHNOLOGY AB
- 当前专利权人: SSAB TECHNOLOGY AB
- 当前专利权人地址: P.O. Box 70 101 21 Stockholm SE
- 代理机构: VALEA AB
- 优先权: EP17205153.4 20171204
- 主分类号: C22C38/00
- IPC分类号: C22C38/00 ; C21D8/02 ; C21D1/20 ; C22C38/02 ; C22C38/04 ; C22C38/06 ; C22C38/42 ; C22C38/44 ; C22C38/46 ; C22C38/48 ; C22C38/50
摘要:
Hot-rolled steel having a tensile strength of at least 950MPa and a microstructure comprising bainite at an area ratio of 70% or more; the balance being: martensite at an area ratio of 30%or less, and optionally ferrite at an area ratio of 20% or less. The hot- rolled steel has a chemical containing (in mass-%):C: 0.07-0.10, Si: 0.01-0.25, Mn: 1.5- 2.0, Cr: 0.5-1.0, Ni: 0.1-0.5, Cu: 0.1-0.3, Mo: 0.01 -0.2, Al: 0.01 -0.05, Nb: 0.015-0.04, V: 0-0.1, i.e. optionally up to 0.1 mass-% Vanadium, Ti: 0-0.1, whereby the balance is Fe and unavoidable impurities.