... ,2)High Hardness &Low Breakage.3)Good wear-Resistance,4)high Cr balls Hardness:58HRC Min. Our main products:High& low chrome cast grinding ... 58-65Low Cr : Surface HRC 45-52Forged ball: HRC 50~60C). Characteristics: 1) High hardness 2) Good wear-Resistance 3) No breaking4) ... 3.0,Si≤1.2,Mn≤1.5, Cr: 1.0~2.2, Mo ≤1.0, P≤0.10, S≤0.10.Forged ... 74,Si:0.15~0.37, Mn:0.45~1.2,S:0.04max. P:0.04Max.Cr :0.60max.F). ...