1. High Hardness Surface hardness of steel ball is to 60-68 HRC and volume hardness of grinding media is to 60-65 HRC 2. High Impact Toughness The impact toughness is higher than 15 Jcm2 3. Low Broken Rate The actual broken rate is not higher than 1 4. Even Wear-resistance The wear rate of cast ball is 50-700 gton.
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