通过正交试验分析讨论了残余稀土、残余镁和原铁水含硫量对球墨铸铁组织和力学性能的影响，并得出在该试验条件下，能够获得在组织和性能最佳情况下的三者含量搭配关系。 The influence of residual sulfur content, residual magnesium content and original molten iron content on the microstructure and mechanical properties of ductile iron was analyzed by orthogonal test. The results show that under the test conditions, Content with the relationship.