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Impact Resistance Hot Rolled Hot Forged Steel Mini Mill Grinding Ball. Low Breakage Rate: Breakage rate is extremely low, consistently below 1%. High Impact Toughness: Impact toughness exceeds 12j/cm2 with high resistance to spalling. Customizable Size: Diameter range is customizable from 20mm to 152.4mm. Uniform Hardness: Surface hardness reaches 57-65hrc with consistent gradient to core. Advanced Manufacturing: Forged and hot rolled process ensures compact structure and high density. Wear Resistance: Anti-crushing properties are 10 times that of common casted steel balls. OEM/ODM Support: Supports logo, color, and appearance size customization. International Standards: Conforms to international quality standards and enterprise specs.