30-100mm Steel Grinding Balls for Ball Mill Type Forged or rolled steel grinding balls with proper heat treatment Application fields:gold mines,iron ore,copper ore ,etc for mineral grinding Hardness: HRC60-65(Surface and Volumetric) Characteristics: High hardness, good wear resistance, no breakage. We use the special high carbon steel materials to produce the mill balls to ensure the good performance of high hardness and wear resistance applicable in ball mills. For any interest or new enquiry, please don't hesitate to contact us.