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发明授权
CN101448967B 抗应变时效性优异的高强度管线管用钢管和高强度管线管用钢板以及它们的制造方法 有权

抗应变时效性优异的高强度管线管用钢管和高强度管线管用钢板以及它们的制造方法
摘要：
本发明提供抑制了经扩管的钢管的纵向屈服强度的由耐腐蚀涂装时的加热所引起的上升，并且抗应变时效性优异的高强度管线管用钢管和作为其坯材的钢板。本发明的抗应变时效性优异的管线管用高强度钢管，其特征在于，母材的成分组成以质量％计含有Mo：超过0％但不到0.15％、Mn：1.7～2.5％，Mo/Mn满足超过0但在0.08以下，含有C、Si、P、S、Al、Ti、N、B，还含有Ni、Cu、Cr中的一种或两种以上，其余部分由铁以及不可避免的杂质组成，P值在2.5～4.0的范围内，金属组织包含贝氏体和马氏体，P值＝2.7C+0.4Si+Mn+0.8Cr+0.45(Ni+Cu)+2Mo。进而，还可以含有Nb、V、Ca、REM、Mg中的一种或两种以上。
摘要（英）：

The present invention provides a high-strength steel pipe for line pipings which has excellent unsusceptibility to strain aging and gives an expanded pipe whose lengthwise-direction yield strength is inhibited from increasing upon heating for corrosion-resistant coating; and a steel plate which is a raw material. The high-strength steel pipe for line pipings which has excellent unsusceptibility to strain aging is characterized in that the composition of the base contains, in terms of mass%, 0-0.15%, excluding 0% and 0.15%, Mo and 1.7-2.5% Mn, provided that Mo/Mn is 0-0.08, excluding 0, contains C, Si, P, S, Al, Ti, N, and B, and further contains one or more of Ni, Cu, and Cr, with the remainder being iron and unavoidable impurities, and that the value of P is 2.5-4.0 and the metal structure comprises bainite and martensite. P=2.7C+0.4Si+Mn+0.8Cr+0.45(Ni+Cu)+2Mo The composition may further contain one or more of Nb, V, Ca, REM, and Mg.

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