破碎矿石用的钢球一般都用普通的碳素钢来锻造,我厂生产的钢球是采用t5圆钢锻造。最近我厂进行了试用球墨铸铁锻造钢球的试验。经一段时期摸索终于获得成功,为更广泛使用球墨铸铁代替钢件开辟了一条新的道路。试验的结果及有关情况简介如下:(一)验测所用材料:为因焖火后延伸率低于7% Balls used in the crushing of ore are usually forged by ordinary carbon steel. The steel balls produced by our factory are forged by t5 round bar. Recently I plant trial ductile iron forged steel ball test. After a period of groping finally achieved success, for a wider use of ductile iron instead of steel has opened up a new road. The results of the test and the relevant briefings are as follows: (a) test the material used: as the fire after the elongation of less than 7%