对X70管线钢的化学成分进行调整，研究了碳、铬、钼元素对该管线钢显微组织、力学性能和耐磨性能的影响。结果表明：不同成分试验钢的显微组织均为针状铁素体+准多边形铁素体+粒状贝氏体，力学性能均满足API SPEC 5L对X70管线钢的要求；适当增加碳元素或铬元素含量均可提高试验钢的抗拉强度和耐磨性能；钼元素对试验钢的抗拉强度没有显著的影响，当钼质量分数由0增至0.22%时，耐磨性能先降后升。

Chemical composition of X70 pipeline steel was adjusted, and the effects of C, Cr, Mo elements on the microstructure, mechanical properties and wear resistance of the pipeline steel were studied. The results show that the microstructures of the tested steels with different composition were composed of acicular ferrite, quasi-polygonal ferrite and granular bainite, and the mechanical properties all met the requirements of API SREC 5L specifications for X70 pipeline steel. Increasing the content of C or Cr element appropriately increased the tensile strength and wear resistance of the tested steel. Mo element had little effect on the tensile strength of the tested steel, and the wear resistance of the tested steel first decreased and then increased when the mass fraction of Mo increased from 0 to 0.22%.