... , 20G, Q345, Q390, 10MoVNb, 12CrMo, 15CrMo and 12Cr2Mo; Pipes for oil cracking GB9948-86 of 10, 20, 12CrMo, 15CrMo, 1Cr2Mo and ... GB/T8163-1999 of 10, 20, Q295, Q345Oil pipes for oil well and hoop pipe API SPEC 5CT of J55 and N80 ... deputize dealing in valves, angle-steel, groove-steel and other well-known profiles, and will provide swift and high-quality service ...