... used for surface preparation applications(2)≥53-60HRC:With this hardness,Newly made bearing steel grit is angularity , the grit ... , pre-treatment of surface or reinforcement.(3) ≥60HRC:High hardness, sharp edges remain during operation, mainly used for marble cutting ... alloy angular steel grit is of good metallographic structure, uniform hardness, long anti-fatigue life, and high impact and wearing ...