采用一种新的HOP(Heat on-line partitioning)技术使X80管线钢得到了(B+M/A)复相组织.与普通X80管线钢相比,(B+M/A) X80管线钢在满足强度要求的基础上,有更优良的变形能力,其屈强比为0.80,均匀伸长率为10.3%,形变强化指数为0.14,满足了大变形管线钢的技术要求,适合应用于地震带、冻土等大位移的油气管线服役环境.显微组织分析表明,在(B+M/A) X80管线钢中,回火态贝氏体和细微化M/A间的复合作用,赋予材料高的强、塑特性.其中贝氏体基体中碳化物的析出和马氏体的形成,保证了材料具有较高的强度.贝氏体基体回火软化、位错恢复和薄片状或块状残留奥氏体的形成,使得材料具有良好的塑性变形能力.
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