... surface preparation applications(2)≥53-60HRC:With this hardness,Newly made bearing steel grit is angularity , ... of surface or reinforcement.(3) ≥60HRC:High hardness, sharp edges remain during operation, mainly used for ... steel grit is of good metallographic structure, uniform hardness, long anti-fatigue life, and high impact ... cleaning and polishing etc, skype:qt.1131 QQ:1742625742 Tel:008615966055683