发明授权
- 专利标题: Seamless steel tubes and method for producing the same
- 专利标题(中): 无缝钢管及其制造方法
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申请号: US11592782申请日: 2006-11-03
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公开(公告)号: US07316143B2公开(公告)日: 2008-01-08
- 发明人: Kunio Kondo , Yuji Arai
- 申请人: Kunio Kondo , Yuji Arai
- 申请人地址: JP Osaka
- 专利权人: Sumitomo Metal Industries, Ltd.
- 当前专利权人: Sumitomo Metal Industries, Ltd.
- 当前专利权人地址: JP Osaka
- 代理机构: Marshall, Gerstein & Borun LLP
- 优先权: JP2004-138825 20040507
- 主分类号: B21B19/04
- IPC分类号: B21B19/04
摘要:
A seamless steel tube comprising, in mass %, C: 0.30 to 0.50%, Si: 0.5% or less, Mn: 0.3 to 2.0%, P: 0.025% or less, S: 0.005% or less, Cr: 0.15 to 1.0%, Al: 0.001 to 0.05%, Ti: 0.005 to 0.05%, N: 0.02% or less, B: 0.0005 to 0.01% and O (oxygen): 0.0050% or less, wherein Beff defined in following equation (a) or (b) takes a value of 0.0001 or more, where Beff=B−10.8×(N−14×Ti/47.9)/14—(a) when Neff=N−14×Ti/47.9≧0, and Beff=B—(b) when Neff=N−14×Ti/47.9
公开/授权文献
- US20070101789A1 Seamless steel tubes and method for producing the same 公开/授权日:2007-05-10