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Chrome steel ball Chemical Composition C% Si% Mn% Cr% Cu% S% P% 0.90~1.05 0.15~0.35 0.25~0.45 1.35~1.65 0.3max 0.03 max 0.03max Density: 7.84 g/cm3 Hardness: through hardened, HRC 60 Min Grade: 5...