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Chinese Supplier High-Strength Customized Design Forged Steel Grinding Ball for Metallurgy Industry DESCRIPTION 1. Grade 45 ,50Mn,60Mn,65Mn,B2,B3,BL,BG 2. Diameter 15mm-150mm 3. Hardness HRC 55-65 4. Breakage Rate 1 5. Impact Value 12j Cm^2 6. Falling ball times ≥20000s. Forged(Rolling) Steel Ball Classification and Chemical Composition.We have than 1, 000 employees so far, and already set up trading company in China, United States, Hong Kong, Korea and Virgin Islands. Our annual turnover is closed to $300 million USD. Our head office is in Liaoning. With geographical advantages of Liaoning,.