Spheroidal graphite cast iron is made from 100% Longyan pig iron by using magnesium ferro silicon as nodulizing agent and adding 0 00%,0 01%,0 02%,0 03%,0 04%,0 05%,0 07% RE Si Fe alloy respectively.

• 全部采用龙岩生铁，制取球墨铸铁。球化剂为镁硅铁合金，同时分别添加0．00%25、0．01%25、0．02%25、0．03%25、0．04%25、0．05%25、0．07%25稀土硅铁合金进行球化处理。