绪言孕育后的球铁铁水的孕育衰退现象是已经很熟悉的了。另外,孕育剂本身也显著地影响孕育效果。常用的75~＃硅铁价格便宜,但已发现孕育效果不够强烈,所需加入量也多,因此,研究高效的新孕育剂就显得很有意义。在硅铁的基础上加入少量强烈促使石墨化的元素,或能形成稳定结晶核心的微量元素的复合孕育剂,可以达到这一目的。为了使复合孕育剂在型内孕育时熔解均 INTRODUCTION The nurturing ductile iron after inoculation recession phenomenon is already very familiar. In addition, inoculants themselves also significantly affect the inoculation effect. Commonly used 75 ~ # ferrosilicon cheap, but it has been found that the incubation effect is not strong enough, the required amount is also more, therefore, the study of effective new inoculant is of great significance. This can be done by adding a small amount of a ferric compound that strongly promotes the graphitization to the ferrosilicon, or a trace element that forms a stable crystalline core. In order to make the compound inoculant in the type of inoculation when melting are