What the skew rolling mill advantage:
1. Hot skew forged grinding ball has high hardness: surface hardness to 58-65HRC, volume hardness of 57-64HRC
2. Impact toughness high: impact toughness more than 12J-35J / cm2.
3. Broken rate is low: the actual broken rate is not higher than 0.5%.
4. Loss of forged grinding ball round rate is low.
5. Dropping test in 8m high tester for more than 20,000 times.