Piston Rod:1.Material:CK45,ST52,20MnV6,42CrMo4,40Cr 2.Ground and chrome plated 3.Diameter:6~1000mm 4.length:1000~8000m Detailed Description1.CHEMICAL COMPOSITION MaterialC%Mn%Si%S%P%V%Cr%Ck450.42-0.500.50-0.800.040.0350.035ST520.221.60.550.0350.0420MnV60.16-0.221.30-1.700.10-0.500.0350.0350.10-0.2042CrMo40.38-0.450.60-0.900.15-0.400.030.030.90-1.2040Cr0.37-0.450.50-0.800.17-0.370.80-1.102. ...