HM3 Forged Alloy Steel Balls(90-150mm) Hardness: HRC55-65(Surface and Volumetric) Characteristics: High hardness, good wear resistance, no breakage. We use the special steel materials to produce the SAG and Ball mill balls to ensure the good performance of high hardness, high impact and wear resistance applicable in SAG mills and ball mill. For any interest or new enquiry, please don't hesitate to contact us.