1)grinding ball 2)Diameter: 20mm - 150mm.3) Hardness:HRC55-65; High Cr : HRC 60-64. Low Cr: HRC 45-50. 4)Breakage rate:1.0%Max;dropping test:10,000 times minimum with 7.5 meter dropping test machine. 5)Impact fatigue life test: AK.=12 J/cm² Minimum 6)Characteristics: 1) High hardness.2)Good wear resistance.3) Good even wear. 4) No breaking.7)Applied fields:1)Mines.2)Cement plants.3)Water coal slurry.3) Power stations.4) Chemical industry. 8)packing: container bag/jumbo sacks(1000kg/bag), steel drum(850kgs-1000kgs/drum). 9)chemical Elements (%): C:2.1~3.20 Mn: 0.50-1.50; Cr: 5.0-10.0; Si: 1.2 Max; P: 0.08 Max, S:0.06Max; tons,1500tons/month 20-150mm