将铸铁钢锭模使用前后的化学成分及显微组织变化做了对比研究。结果表明,钢锭模经反复使用后,其化学成分及组织发生了明显变化。距内壁30mm 区的碳、硅、锰严重氧化,距内壁20mm 区的石墨片逐渐烧损,距外壁20～40mm 区珠光体逐渐球化、聚集、石墨化,向内形成相变区。 The cast iron ingot mold before and after the chemical composition and microstructure changes made a comparative study. The results showed that the chemical composition and microstructure of ingot mold changed obviously after repeated use. Carbon, silicon and manganese were seriously oxidized from the 30mm inner wall, and gradually burned from the 20mm inner graphite wall. The pearlite in the zone of 20 ~ 40mm from the outer wall was gradually nodular, aggregated and graphitized, forming a phase transformation zone inwardly.