1.Feature: 1) high hardness: surface hardness is to 60-68 hrc and volume hardness is to 60-63 hrc; 2) high impact toughness: 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 50-300g/ton.
