以300-520铸钢力学性能为指标,对300-520铸钢基本成分进行优化研究。通过金相组织观察、拉伸试验和冲击试验对试样的组织和力学性能进行了表征,确定C、Si和Mn元素含量范围。试验结果表明,在C为0.20%～0.25%,Si为0.29%～0.50%,Mn为0.82%～1.10%范围内,所有试样的拉伸性能和冲击性能均能达到300-520铸钢的性能指标。 Based on the mechanical properties of 300-520 cast steel, the basic composition of 300-520 cast steel was optimized. The microstructure and mechanical properties of the samples were characterized by microstructure observation, tensile test and impact test to determine the content of C, Si and Mn. The results show that the tensile and impact properties of all the samples can reach 300-520 cast steel in the range of 0.20% ~ 0.25% of C, 0.29% ~ 0.50% of Si and 0.82% ~ 1.10% of Mn Performance.