我厂在制造球墨铸铁和铸铁中曾发生几次技术事故,反应出来的现象是老工友从来没有见过的,在理论上也不能给予充分的解释,请帮助解决。1.在球墨铸铁焖火时,由于事先没有交代清楚,因此温度烧得过高,结果小型铸件都熔化了。在未完全熔化的残体上,发现铸件外皮完整,而中间均已熔掉,甚至仅2公厘厚的铸件也发现中 I plant in the manufacture of ductile iron and cast iron have been several technical incidents, the reaction of the phenomenon is never seen by old workers, in theory can not give adequate explanation, please help solve. 1. When nodular cast iron is stewed in fire, the temperature burns too high as a result of the lack of clarification in advance, and as a result, the small castings are melted. Found in the incomplete melting of the remnants of the castings complete, and the middle have been melted, and even 2 cm thick castings are also found in