... AND FORGING CO.,LTD is one of the largest factory specialized in producing forged steel grinding ball and cast grinding ball ... meter. Our annual product of grinding balls is about 50000 ton. We mainly export our steel balls to Japan, Korea, Malaysia, ... The hardness and chemical composition of our grinding balls as follows: 1.Forged grinding ballSize: 20mm-180mmHardness:HRC55-65Chemical elements:C ...