... 3. Shot peening 4. Sand blasting 5. Pre-treatment 6.marble cutting Hardness: (1)>40-50HRC: With this hardness, bearing steel ... High hardness, sharp edges remain during operation, mainly used for marble cutting,characters: stable and reliable performance,even size , good abrasion ... and workers’ health. Angular bearing steel grit used for marble cutting , skype:qt.1131 QQ:1742625742 Tel:008615966055683