Steel Shot and Steel Grit Main Technical Index of the Products Name Steel Shot Steel Grit External firm Round or similar round Polygon Chemical Analysis（%） C Mn Si P S 0.85-1.20 0.60-1.20 0.40-1.00 ≤0.05 ≤0.05 Hardness Common40-52HRC/Special53-60HRC 40-52HRC 53-58HRC 59-65HRC Microstructure Tempered Martensite Density ≥7.4g/cm? ≥7.6g/cm?