一、前言华东建筑机械厂铸工车间规模较小,在批林批孔运动推动下,产量大幅度增长,为此要求本厂能生产具有较高塑性、韧性的球墨铸铁件,以代替可锻铸铁件和碳钢件。因场地小而不能建造热处理工部,在车间党支部领导下, I. Introduction Huadong Construction Machinery Factory is a small-scale foundry workshop. Driven by the approval of Lin and Kong Kong holes, the output has increased substantially. Therefore, it is required that the factory can produce ductile iron castings with high ductility and toughness to replace ductile iron castings and Carbon steel parts. Because of the small site and can not build heat treatment department, under the leadership of the party branch in the workshop,