grinding steel ball 1.SIZE:20-150MM 2.HARDNESS:55-65 3.APPLIED FIELD: MINES, CEMENT PLANTS, POWER STATIONS,CHEMICAL INDUSTRIE Grinding steel ball1.FORGING STEEL GRINDING BALLSA.SIZE:20-150MMB.HARDNESS:55-65C.APPLIED FIELD: MINES, CEMENT PLANTS, POWER STATIONS,CHEMICAL INDUSTRIE...2.RCAB-1 NEW MATERIALS FORGED STEEL BALLSA.SIZE:40-150MMB.HARDNESS:55-65C.APPLIED FIELD: MINES, CEMENT PLANTS, POWER ...