... *10,10*12,12*14,14*16,16*18,18*20,20*25,25*30,30*35,35*40,35*45B). HardnessHigh Cr ... industryE).Chemical Composition.High Cr balls: C:2.0~3.2,Si≤1.0, Mn≤1.5, Cr: 10~28, Mo ≤1.0 ... , P≤0.10, S≤0.08.Low Cr balls: C:2.0~3 ... .0,Si≤1.2,Mn≤1.5, Cr: 1.0 ... ~2.2, Mo ≤1.0, P≤0.10, S≤0.10.Forged balls: C:0 ...