发明授权
- 专利标题: Highly anticorrosive high strength stainless steel pipe for linepipe and method for manufacturing same
- 专利标题(中): 用于线管的高防腐高强度不锈钢管及其制造方法
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申请号: US10576885申请日: 2004-10-22
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公开(公告)号: US07862666B2公开(公告)日: 2011-01-04
- 发明人: Mitsuo Kimura , Takanori Tamari , Yoshio Yamazaki , Ryosuke Mochizuki
- 申请人: Mitsuo Kimura , Takanori Tamari , Yoshio Yamazaki , Ryosuke Mochizuki
- 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: JP2003-373404 20031031; JP2004-038854 20040216; JP2004-117445 20040413; JP2004-135973 20040430
- 国际申请: PCT/JP2004/016075 WO 20041022
- 国际公布: WO2005/042793 WO 20050512
- 主分类号: C22C38/00
- IPC分类号: C22C38/00 ; C22C38/18 ; C22C38/22 ; C22C38/24 ; C22C38/26 ; C21D9/08
摘要:
A highly corrosion resistant high strength stainless steel pipe for linepipe, having a composition containing about 0.001 to about 0.015% C, about 0.01 to about 0.5% Si, about 0.1 to about 1.8% Mn, about 0.03% or less P, about 0.005% or less S, about 15 to about 18% Cr, about 0.5% or more and less than about 5.5% Ni, about 0.5 to about 3.5% Mo, about 0.02 to about 0.2% V, about 0.001 to about 0.015% N, and about 0.006% or less O, by mass, so as to satisfy (Cr+0.65 Ni +0.6Mo+0.55Cu−20C≧18.5), (Cr+Mo+0.3Si−43.5C−0.4Mn−Ni−0.3Cu−9 N≧11.5) and (C+N≦0.025). Preferably quenching and tempering treatment is applied to the pipe. The composition may further contain about 0.002 to about 0.05% Al, and may further contain one or more of Nb, Ti, Zr, B, and W, and/or Cu and Ca. The microstructure preferably contains martensite, ferrite, and residual γ.
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