稀土和镁同样是球墨铸铁的一种优良球化剂。但稀土元素的熔点高,比重大。当加入铁水之后,如果没有充分的搅拌,往往不能充分发挥其作用。目前传统采用的是以压入或冲入法向铁水中加入稀土,由于动力学条件差,稀土元素与铁水不能充分熔合,导致球化效果不佳,并使加入稀土量增加, Rare earth and magnesium are also an excellent nodulizer for ductile iron. However, the melting point of rare earth elements, a large proportion. When added to hot metal, it can not be fully utilized without sufficient agitation. At present, the traditional method is to add rare earth into molten iron by pressing or rushing into the normal hot metal. Due to poor kinetics conditions, rare earth elements and hot metal can not be fully fused, resulting in poor spheroidization effect and the addition of rare earth,