1.Chemical Composition of the products: C 0.70-1.20% Mn 0.60-1.20%, Si 0.40-1.20%, Sí_ 0.05%, Pí_ 0.05% 2. Hardness: Normal: 40-50HRC Special: 52-56HRC , 56-60HRC Density: 7.4/cucm 3. Microstructure: Tempered Martensite High strength,durable,Ervin life:Cast steel grit:2500-3000 cycles. 25kg/bag,40bags/ton.