发明公开
- 专利标题： HIGH-STRENGTH STEEL PIPE WITH EXCELLENT UNSUSCEPTIBILITY TO STRAIN AGING FOR LINE PIPING, HIGH-STRENGTH STEEL PLATE FOR LINE PIPING, AND PROCESSES FOR PRODUCING THESE
- 专利标题（中）： 具有优异的抗抗衰老作用绵延PIPES，高强度钢板管道和工艺生产高强度钢管
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申请号： EP07743726.7申请日： 2007-05-14
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公开(公告)号： EP2039793A1公开(公告)日： 2009-03-25
- 发明人: ASAHI, Hitoshi , HARA, Takuya , DOI, Naoki , TERADA, Yoshio
- 申请人： Nippon Steel Corporation
- 申请人地址： 6-3, Otemachi 2-chome Chiyoda-ku Tokyo 100-8071 JP
- 专利权人： Nippon Steel Corporation
- 当前专利权人： Nippon Steel Corporation
- 当前专利权人地址： 6-3, Otemachi 2-chome Chiyoda-ku Tokyo 100-8071 JP
- 代理机构： Vossius & Partner
- 优先权： JP2006144147 20060524
- 国际公布： WO2007136019 20071129
- 主分类号： C22C38/00
- IPC分类号： C22C38/00 ; B21B1/26 ; B21B3/00 ; B21C37/08 ; B23K9/18 ; C21D8/02 ; C22C38/58 ; B23K101/06
摘要：
The present invention provides steel plate for high strength line pipe suppressing the rise in yield strength in the longitudinal direction of expanded steel pipe due to the heating at the time of coating to prevent corrosion and superior in strain aging resistance and steel pipe for the material for the same, that is, high strength steel pipe for line pipe superior in strain aging resistance characterized in that a base material having a composition of chemical elements containing, by mass%, Mo: over 0% to less than 0.15% and Mn: 1.7 to 2.5%, satisfying Mo/Mn: over 0 to 0.08, containing C, Si, P, S, Al, Ti, N, and B, furthermore containing one or more of Ni, Cu, and Cr, having a balance of iron and unavoidable impurities, having a P value of 2.5 to 4.0 in range, and having a metallurgical structure comprised of bainite and martensite: P - value = 2.7 C + 0.4 Si + Mn + 0.8 Cr + 0.45 ( Ni + Cu ) + 2 Mo .
Furthermore, it may contain one or more of Nb, V, Ca, REM, and Mg.
Furthermore, it may contain one or more of Nb, V, Ca, REM, and Mg.
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