通过拉伸试验测定了X70大变形管线钢管的屈服强度Rt0.5、抗拉强度Rm、屈强比Rt0.5/Rm、应力比、均匀变形伸长率,并对比了系列温度下的冲击韧性,分析了管体的显微组织以及-100℃冲击断口的形貌.结果表明:管体纵向具有优异的拉伸性能,最小的Rt0.5为478 MPa,Rt0.5/Rm低于0.69,均匀变形伸长率大于11％;-100℃时的横向冲击吸收能为120 J,剪切断面率为90％;断口呈韧性断裂特征,管材具有良好的低温韧性,韧脆转变温度低于-100℃;该管线钢是以铁素体、粒状贝氏体为主的双相组织,管体中心存在显著的粒状贝氏体带.
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