... 130 mm 2)Grinding endurable 3)Hardness: 52-65HRC 4)Material:50Mn,60Mn Forged Steel Ball:1.Material 50Mn ... of-round, Low percentage of damage, High total mill efficiency.4.Apply Realm: Cement plan, mine , Mill tailings ,Thermal ... 0.89 1124 70 +3.0, -2.0 1.4 714 80 +3.2, -2.0 2.1 ... .2, -2.0 3 333 100 +4.0,-3.0 4.1 244 110 +4.0,-3.0 5.47 283 120 ... +4.0,-3.0 7.1 141 130 +4.0 ...