在现代化装备制造业高速发展的同时，材料磨损所导致的资源消耗与经济损失日益显著。 耐磨铸钢的研究与进步，不仅有助于提高生产效率、减少资源浪费和降低经济损失，更在推动科技进步和装备制造业发展方面发挥着积极作用。 本文在 35Cr2Ni2Mo 铸钢中添加 Mg 元素，为新型高性能耐磨铸钢的推广应用提供了研究基础。 采用金相显微镜、扫描电镜、透射电镜观察了钢材的显微组织，利用显微硬度计和拉伸试验机分别测定了钢材的硬度和力学性能，利用摩擦磨损试验机测定了钢材的耐磨性能。 结果表明，添加 Mg 元素后，铸钢的组织依旧为板条状回火索氏体，碳化物尺寸更加细小。 非金属夹杂物中小尺寸夹杂比例更多。 强度、硬度上升，塑性下降，耐磨性能更佳。

With the rapid development of the modern equipment manufacturing industry, resource consumption and economic losses caused by material wear are becoming increasingly significant. The research and progress of the wear-resistant cast steel not only helps to improve production efficiency, reduce resource waste and reduce economic losses, but also plays a positive role in promoting scientific and technological progress and the development of equipment manufacturing industry. In this paper, Mg is added to 35Cr2Ni2Mo cast steel, which provides the research basis for the popularization and application of new high performance wear resistant cast steel. The microstructure of the steel was observed by optical microscope, scanning electron microscope and transmission electron microscope. The hardness and mechanical properties of the steel were measured by a microhardness tester and tensile testing machine, and the wear resistance of steel was measured by friction and wear testing machine. The results show that after the addition of Mg, the microstructure of the cast steel remains lath tempered sorbite, with a finer carbide size. The proportion of non-metallic inclusions with small size is greater. The strength and hardness increase, the toughness decreases, and the wear resistance is better.