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发明公开
CN105102654A 厚壁钢管用钢板、其制造方法以及厚壁高强度钢管 有权

厚壁钢管用钢板、其制造方法以及厚壁高强度钢管
摘要：
本发明提供环缝焊接热影响部的CTOD特性优异的厚壁钢管用钢板及其制造方法以及厚壁钢管。一种钢板，含有C：0.03～0.10％、Si：0.05～0.50％、Mn：1.00～2.00％、P：0.015％以下、S：0.005％以下、Mo：0.20％以下(包含0％)、Nb：0.01～0.05％、根据需要的Al：0.005～0.1％、Cu：1.00％以下、Ni：1.00％以下、Cr：0.50％以下、V：0.05％以下中的1种或2种以上、Pcm*(％)(＝C+Si/30+(Mn+Cu+Cr)/20+Ni/60+Mo/2+V/10)≤0.20，其余部分由Fe和不可避免的杂质构成，母材的贝氏体分率为50％以上且二相域再加热粗粒区域的岛状马氏体(MA)分率为5.0％以下。将上述成分组成的连续铸造钢坯再加热至特定温度后，进行热轧，其后，实施加速冷却至550～250℃。
摘要（英）：

Provided are a steel plate for thick steel pipe having superior CTOD characteristics in parts thermally affected by circumferential welds, a manufacturing method for the same, and a thick steel pipe. A steel plate is formed from 0.03 - 0.10% C, 0.05 - 0.50% Si, 1.00 - 2.00% Mn, 0.015% or less P, 0.005% or less S, 0.20% or less (including 0%) Mo, 0.01 - 0.05% Nb, and if necessary, one or two or more of 0.005 - 0.1% Al, 1.00% or less Cu, 1.00% or less Ni, 0.50% or less Cr, and 0.05% or less V, Pcm* (%) (= C + Si/30 + (Mn + Cu + Cr)/20 + Ni/60 + Mo/2 + V/10) <= 0.20, with the remainder being Fe and inevitable impurities. The bainite fraction of the parent material is 50% or greater and the island shaped martensite (MA) fraction in a two-phase reheated granular region is 5.0% or less. After a continuous cast slab of the component system above is reheated to a specific temperature, the same is hot rolled and thereafter undergoes accelerated cooling to 550 - 250 DEG C.

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