在生产球墨铸铁时,铸铁中的石墨形态常常发生变化。尤其是在浇铸大断面球墨铸铁件时,铸件中心的石墨经常出现球化衰退现象。通过分析球化衰退的原因,提出了严格控制铁液成分、合理使用球化剂等改进措施,有效地提高了大断面球墨铸件的质量。 Graphite morphology in cast iron often changes when producing ductile iron. Especially in the casting of large sections of ductile iron castings, the center of the casting graphite often spherical degeneration phenomenon. By analyzing the reasons for the decline of spheroidization, we put forward the improvement measures such as strictly controlling the composition of molten iron, using nodularizing agent reasonably, and effectively improving the quality of large-section ductile castings.