1, Chemical Compositions: C: 0.70-1.20% Mn: 0.60-1.20% Si: 0.40-1.20% S less than 0.05% P less than 0.05% 2, Average hardness ( 500g loading ) Normal: 40-50HRC (377-509HV) Special: 52-56HRC (543-620HV) Special: 56-60HRC (620-713HV) 3, Hardness deviation: Max deviation3.0HRC (40HV) 4, Metallography structure: Even tempered martensite and dispersed carbon 5, Min density ( Alcohol replace testing) :7.4g/cm3 6, High strength, long lasting Ervin life: Cast steel shot: 2200 cycles