Material:steel Surface Hardness:HRC60-65 Impact toughness:>12j/cm2 Endurance impact testï¼?>13000 Chemical elementsï¼?C Si Mn P S Cr 1.Feature: 1) High Hardness: The surface hardness of forged and rolling balls is to 60-65 HRC and volume hardness is to 60-63 HRC 2) High Impact Toughness: The impact toughness is more than 12 J/cm2; 3) Low Broken Rate: The actual broken rate is not higher than 1%; 4) Even Wear-resistance: The loss of ball round rate is 50-300 g/ton.
