我厂从1970年开始采用球墨铸铁代钢。几年来,尤其是对S195柴油机曲轴(包括高磷球铁曲轴)的热处理采用正火处理,经过不断实践,取得了一些成果。为把球铁曲轴的质量与生产工艺进一步提高,加速农业机械化的发展还要认真的研究。同样成份的铸态球铁件,采用不同的热处理工艺会得到不同的金相组织,因此机械 I plant from 1970 on behalf of the ductile iron steel. In recent years, especially the heat treatment of S195 diesel engine crankshaft (including high phosphorus ductile iron crankshaft), the use of normalizing treatment, after continuous practice, and achieved some results. In order to further improve the quality and production technology of the ductile iron crankshaft, we must seriously study the acceleration of the development of agricultural mechanization. The same composition cast ductile iron pieces, using different heat treatment process will be different from the microstructure, so the machinery