介绍了球墨铸铁的合金成分设计,阐述了高强高塑性球墨铸铁的制备方法。通过添加合金元素与痕量元素,改进球化孕育工艺,可提高球墨铸铁的球化率,细化石墨,使珠光体和铁素体得到合理搭配,在强度提高的同时得到高塑性,远高于对应的国家标准。该球墨铸铁在常温条件下抗拉强度达到750 MPa,屈服强度达到560 MPa,伸长率达到7.5%以上。 The alloy composition design of ductile iron is introduced, and the preparation method of high strength and ductile ductile iron is expounded. By adding alloying elements and trace elements, to improve the gelatinization process can increase the nodular cast iron nodular rate, refine graphite, pearlite and ferrite get a reasonable match, the strength increased at the same time by the high plasticity, far higher In the corresponding national standards. The nodular cast iron has a tensile strength of 750 MPa at room temperature, a yield strength of 560 MPa and an elongation of 7.5% or more.