球墨铸铁生产中常发生孕育作用随时间延续而衰退的现象。延续的时间越长,孕育作用越弱,机械性能越坏,甚至达不到技术要求。特别是我厂生产的球墨铸铁均为铸态球墨铸铁,加之又是用电弧炉熔化铁水,过热温度高,白口倾向大,而且一 Nodular cast iron often occurs in the production of inoculation over time and the phenomenon of recession. The longer the duration, the weaker the inoculation, the worse the mechanical properties, or even fail to meet the technical requirements. In particular, the production of ductile iron castings are cast ductile iron, combined with the arc furnace is molten iron, overheating temperature is high, the white mouth tends to be large, and a