球墨铸铁是近代机械工业中新出现的材料,由于它的石墨成球状,因而机械性能比普通铸铁好得多,如强度近似于钢或等于钢;耐磨性、抗震性甚至于优于钢,只有延伸率和冲击韧性较钢为低。因此,如何提高球墨铸铁的冲击韧性和延伸率,使它能得到更广泛的应用,便成为一个重要任务。我厂在1956年就开始利用球墨铸铁代替45号钢铸造 Ductile iron is a new material in the modern machinery industry. Because of its graphite into a spherical shape, the mechanical properties are much better than ordinary cast iron, such as the strength of steel is equal to or equal to steel; wear resistance, shock resistance and even better than steel, Only elongation and impact toughness are lower than steel. Therefore, how to improve the ductile iron ductile toughness and elongation, so that it can be more widely used, it has become an important task. I plant in 1956 began to use ductile iron instead of 45 steel casting