目前，我国有近百家铸造厂（车间）生产高强度珠光体球墨铸铁，且大部分厂家是采用正火处理的。所生产的球光体球墨铸铁虽有比较稳定的力学性能和金相组织，但工艺上则存在生产周期长、铸件氧化严重、变形大以及能耗高等问题。据统计，每吨正火球铁件需耗原煤o．8一1．0吨（耗 At present, nearly 100 foundries (workshops) in our country produce high-strength pearlite ductile iron, and most of them are made by normalizing. The spheroidal graphite iron produced by the spheroidal graphite has relatively stable mechanical properties and microstructure, but there are problems in the process such as long production cycle, serious oxidation of castings, large deformation and high energy consumption. According to statistics, each ton of normal-fire ductile iron need to consume raw coal o. 8 a 1.0 tons (consumption