发明授权
- 专利标题: High strength hot rolled steel sheet and method for manufacturing the same
- 专利标题(中): 高强度热轧钢板及其制造方法
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申请号: US10543489申请日: 2004-04-21
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公开(公告)号: US07527700B2公开(公告)日: 2009-05-05
- 发明人: Nobusuke Kariya , Shusaku Takagi , Tetsuo Shimizu , Tetsuya Mega , Kei Sakata , Hiroshi Takahashi
- 申请人: Nobusuke Kariya , Shusaku Takagi , Tetsuo Shimizu , Tetsuya Mega , Kei Sakata , Hiroshi Takahashi
- 申请人地址: JP Tokyo
- 专利权人: JFE Steel Corporation
- 当前专利权人: JFE Steel Corporation
- 当前专利权人地址: JP Tokyo
- 代理机构: Oliff & Berridge, PLC
- 优先权: JP2003-115852 20030421; JP2004-124154 20040420
- 国际申请: PCT/JP2004/005743 WO 20040421
- 国际公布: WO2004/094681 WO 20041104
- 主分类号: C22C38/00
- IPC分类号: C22C38/00
摘要:
The present invention relates to a high strength hot rolled steel sheet consisting of 0.04 to 0.15% C, 1.5% or less Si, 0.5 to 1.6% Mn, 0.04% or less P, 0.005% or less S, 0.04% or less Al, 0.03 to 0.15% Ti, 0.03 to 0.5% Mo, by mass, and balance of Fe and inevitable impurities, and having a microstructure consisting of ferrite containing precipitates, second phase of bainite and/or martensite, and other phase, wherein the percentage of the ferrite containing precipitates is 40 to 95%, and the percentage of the other phase is 5% or less. For example, the high strength hot rolled steel sheet having a thickness of 1.4 mm shows a tensile strength of 780 MPa or higher, an elongation of 22% or higher elongation, and a hole expansion ratio of 60% or higher, thus the steel sheet is suitable for reinforcing members automobile cabin and crash worthiness members of automobile.
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