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Forged Grinding Steel Ball Size from dia 25mm to dia 160mm . Chemical Composition(%): C: 0.52-0.65 Si: 0.15-0.37 Mn: 0.60-1.20 Cr: ≤ 0.25 S: ≤0.04 P: ≤0.04 Hardness: HRC60-65 Packing: by...