Standard: GB/T 8162 Grade: 10, 20, 35, 45, Q345, 40Mn2,45Mn2,27SiMn, 20CrMo, 35CrMo. OD: 6-660 mm Length:39.34'/12M.max Standard: GB/T 8162Grade: 10, 20, 35, 45, Q345, 40Mn2, 45Mn2,27SiMn, 40MnB, 45MnB, 20Mn2B,20Cr, 30Cr, 35Cr, 40Cr, 45Cr, 50Cr,38CrSi, 12CrMo, 15CrMo, 20CrMo,35CrMo, 42CrMo, 12CrMoV,12Cr1MoV, 38CrMoAl, 50CrVA,20CrMn, 20CrMnSi, 30CrMnSi, 35CrMnSiA, 20CrMnTi, 30CrMnTi,12CrNi2, ...