本文研究了新型铸铁——球墨可锻铸铁的化学成分范围、热处理工艺、机械性能、铸造性能特点。实验证明:可银铸铁经变质处理能使退火碳球墨化,获得具有典型球墨结构的球状石墨;提高可锻铸铁的碳当量,使热处理工艺的高温保温温度降低,保温时间缩短,节省能源,提高生产率。球墨可锻铸铁的机械性能优于可锻铸铁,能与相同基体的球墨铸铁相当,而铸造性能较可锻铸铁有明显改善。 This paper studies the chemical composition of new cast iron - ductile malleable iron, heat treatment process, mechanical properties, casting properties. The experiment proves that the degenerative treatment of silver cast iron can make the annealed carbon nodular graphite obtain the spherical graphite with the typical nodular structure; increase the carbon equivalent of the malleable iron, lower the high temperature holding temperature of the heat treatment process, shorten the holding time, save energy and increase the productivity. Ductile malleable cast iron has better mechanical properties than malleable cast iron, comparable with ductile iron with the same matrix, and significantly improves castability over malleable cast iron.