(一)引言由于球墨铸铁具有良好的机械性能,在一定程度上可以代替可锻铸铁及部分的铸钢和锻钢,所以近年来引起国内很多工业企业的重视。1951年我国就试制成功了球墨铸铁,并取得了一定的成就,所生产的球墨铸铁在机械性能方面已达到相当的水平。目前国内已广泛的开展了对球墨铸铁浇铸,锻压以 (A) Introduction As the ductile iron has good mechanical properties, to a certain extent, can replace the malleable iron and some of the steel and forged steel, so in recent years caused many domestic industrial enterprises attention. In 1951, China successfully trialled the ductile iron and achieved some achievements. The ductile iron produced has reached a considerable level in terms of mechanical properties. At present, China has carried out a wide range of ductile iron casting, forging to