Grinding balls :1)size:25mm-127mm 2)High hardness & low breakage 3) Good wear-resistance 4)High Cr:57 HRC ... :1) High hardness2) Good wear-resistance3) Low breakage4) Low wear rated) Chemical compositionHigh Cr: C:2.0-3.2, Si: ≤1.0, Mn:0 ... .5-2.5, Cr:10.0-28.0 ... :1.0, P: ≤0.1, S: ≤0.1Low Cr: C:2.2-3.6, Si: ≤1.5, Mn:0.5-1.5 ...