... ,Even wearing 4,Good wear resistance Huafu steel balls have the below characteristics: A. high hardness (surface hardness is 50-65 HRC ... steel balls, and factual break rate is lower than 1% when falling times is above 20,000 times from 10m high dropping ... IMPACT TEST≥8000APPLIED FIELDSMines,Power stations,Metallurgical industry,Cement plant Low chrome cast milling ball,grinding cylpebs