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1.发明公开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 审中-公开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
公开(公告)号：EP2039793A1
公开(公告)日：2009-03-25
申请号：EP07743726.7
申请日：2007-05-14
发明人： ASAHI, Hitoshi , HARA, Takuya , DOI, Naoki , TERADA, Yoshio
CPC分类号： B21B3/00 , B21C37/08 , B23K9/18 , B23K2201/06 , B23K2203/04 , C21D6/005 , C21D8/0226 , C21D9/08 , C21D9/085 , C22C38/02 , C22C38/42 , C22C38/44 , C22C38/48 , C22C38/58 , F16L9/02
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.摘要翻译： 本发明提供了一种高强度干线用管抑制屈服强度的上升膨胀钢管的长度方向钢板由于在涂层的时间，以防止在应变腐蚀和卓越的加热老化性和钢管的材料 相同的，所做的是，高强度钢管的管线管用在特征的抗应变时效性优异的那样具有含化学元素的组合物的基体材料，以质量％以下，Mo：超过0％但不到0.15％至和Mn：1.7 ，此外更含有一种或多种镍，铜，大于0至12:08的，含有的C，Si，P，S，铝，钛，N和B和Cr，具有余量的铁：〜2.5％，满足沫/ Mn为 和不可避免的杂质，具有2.5至4.0范围中P值，并具有由贝氏体和马氏体的金属组织：P - 值= 2.7¢C + 0.4¢的Si +的Mn + 0.8¢的Cr + 12:45（镍 + Cu）的+ 2¢MO。 进一步，它可以含有一个以上的Nb，V，钙，REM，Mg中。
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公开(公告)号：EP4092149A1
公开(公告)日：2022-11-23
申请号：EP20914216.5
申请日：2020-01-17
摘要： This steel plate has a predetermined chemical composition, a metallographic structure in a thickness middle portion includes, by area%, 0% to 80% of polygonal ferrite and one or two selected from acicular ferrite and bainite, a remainder is an M-A phase, and an effective grain size is 15.0 µm or less, a metallographic structure in a surface layer that is a range of 1.0 mm in a thickness direction from a surface includes, by area%, a total of 95% or more of one or two selected from acicular ferrite and bainite, and a remainder is an M-A phase, and a maximum hardness in the surface layer is 250 HV0.1 or less.
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