（Product Name）：mill steel ball

   1)Diameter: Φ 20 - Φ 150mm
   2) Hardness: HRC55-63
    3) Characteristics:
    a) High hardness and resistance
    b) Good even wear
    c) No breaking
d)Uniformity of hardness from surface to core
4) Applied fields
    a) Mines
    b) Cement plants
    c) Power stations
    d) Chemical industry
Chemical composition and hardness
Chemical composition(%) 
C 0.52-0.65 Si 0.15-0.37
Mn 0.60-1.20 P<=0.04 S <=0.04
Cr <=0.25 HRC 55-63