... steel, quenched treatment:HRC70°±2°, with excellent wear resistance and impact resistance. Comparing with HSSE\HSS-AL and HSS-Co, ... happen.VRA201: Imported ultra micro-grain diamond tungsten steel, with excellent impact-resistance and general wear-resistance. Generally applied in ... times lifetime, it has higher performance/price ration. Comparing with SKH51, it has 15-25 times lifetime and durability ...