一、前言铸铁的机械性能和物理性能与石墨的形状有很大的关系。目前,石墨形状是根据球化率来测定的,球化率在80%以上(或70%以上)者,称球墨铸铁。按理说,片状石墨铸铁的球化率应是0%,但是,以前把球化率在70%以下的石墨铸铁都作为球化不良而报废。显然, First, the preface Cast iron mechanical properties and physical properties and the shape of graphite has a great relationship. At present, the graphite shape is determined according to the spheroidization rate, and the spheroidization rate is over 80% (or over 70%), and is called ductile iron. It is reasonable to say that the nodular graphite cast iron should have a nodulizing rate of 0%. However, graphite nodular castings having a nodulizing rate of 70% or less have been discarded as spheroidization. Obviously,