发明授权
- 专利标题： High-tensile strength welded steel tube for structural parts of automobiles and method of producing the same
- 专利标题（中）： 汽车结构件高强度焊接钢管及其制造方法
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申请号： US12307439申请日： 2007-06-19
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公开(公告)号： US07887649B2公开(公告)日： 2011-02-15
- 发明人: Shunsuke Toyoda , Masatoshi Aratani , Yoshikazu Kawabata , Yuji Hashimoto , Koji Suzuki , Kei Sakata , Makio Gunji , Akio Sato , Tetsuro Sawaki
- 申请人： Shunsuke Toyoda , Masatoshi Aratani , Yoshikazu Kawabata , Yuji Hashimoto , Koji Suzuki , Kei Sakata , Makio Gunji , Akio Sato , Tetsuro Sawaki
- 申请人地址： JP
- 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
- 代理机构： DLA Piper LLP (US)
- 优先权： JP2006-185810 20060705
- 国际申请： PCT/JP2007/062651 WO 20070619
- 国际公布： WO2008/004453 WO 20080110
- 主分类号： C21D9/08
- IPC分类号： C21D9/08 ; C22C38/00 ; C21D8/02
摘要：
A high-tensile strength welded steel tube has excellent formability and torsional fatigue endurance after being formed into cross-sectional shape and then stress-relief annealed. A steel material used has a composition which contains C, Si, Al, 1.01% to 1.99% Mn, 0.041% to 0.150% Ti, 0.017% to 0.150% Nb, P, S, N, and O such that the sum of the content of Ti and that of Nb is 0.08% or more, the content of each of C, Si, and Al being within an appropriate range, the content of each of P, S, N, and O being adjusted to a predetermined value or less.
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