Product: cost steel shot Type: S780/SS2.5 S660/SS2.0 S550/SS1.7 S460/SS1.4 S390/SS1.2 S330/SS1.0 S280/SS0.8 S230/SS0.6 S170/SS0.5 S110/SS0.3 S70/SS0.2 Chemical composition: C:0.70-1.20% Mn:0.35-1.20% Si:>=0.40 S:<=0.05% P:<=0.05% Hardness: conventional:40-50HRC special:52-56HRC 56-60HRC Durability: 2000-2800times Microstructure: Tempered martensite or sorbite Density: 7.4g/cm3 Bulk density: 4.4g/cm3