发明申请
- 专利标题： ELECTRIC RESISTANCE WELDED STEEL PIPE EXCELLENT IN WELD ZONE AND METHOD OF PRODUCTION OF SAME
- 专利标题（中）： 焊接电阻优良的焊接钢管及其生产方法
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申请号： US14911601申请日： 2014-08-07
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公开(公告)号： US20160193641A1公开(公告)日： 2016-07-07
- 发明人: Hideki HAMATANI , Kenichi YAMAMOTO , Masafumi MIYAZAKI , Masaki INA , Takaaki Fukushi
- 申请人： NIPPON STEEL & SUMITOMO METAL CORPORATION
- 优先权： JP2013-169138 20130816; JP2013-262555 20131219
- 国际申请： PCT/JP2014/070872 WO 20140807
- 主分类号： B21C37/08
- IPC分类号： B21C37/08 ; C22C38/26 ; C22C38/24 ; C22C38/16 ; C22C38/14 ; C22C38/12 ; C22C38/08 ; C22C38/06 ; C22C38/04 ; C22C38/02 ; C22C38/00 ; C21D9/14 ; C21D8/10 ; B22D11/00 ; B23K11/087 ; B23K11/34 ; C22C33/04 ; C22C38/28
摘要：
Electric resistance welded steel pipe excellent in weld zone quality suitable for oil country tubular goods and line pipe wherein steel plate forming the base metal of the electric resistance welded steel pipe has a predetermined chemical composition, the contents of Ca, O, S, Ce, La, and Al satisfy XCASO = ( Ca O + Ca S + 0.285 Ce + La O + 0.285 Ce + La S ) × ( Al Ca ) > 78 the oxide-based inclusions in the weld zone of the electric resistance welded steel pipe contains one or both of Ce and La, and the long axis/short axis of the oxide-based inclusions is 2.5 or less.
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