生产球墨铸铁需要进行球化处理和孕育处理。可是,经过这样的处理之后,如果铁水放置的时间过长,球状石墨就要产生球化衰退现象。其原因究竟是球化剂残留量不足呢?还是孕育作用消失了?还难于弄清。从前,讨论石墨 The production of ductile iron need to deal with the ball and birth treatment. However, after this treatment, if the molten iron is placed too long, spherical graphite will have a ballistic recession. The reason is the nodulizer residue is not enough? Or is the role of birth disappear? It is difficult to find out. Once upon a time, graphite was discussed