... , oil pipe, fluid p Cheap supply carbon steel pipes Our raw materials are all from the largest ... steel factories in China and are of excellent ... professional and strictly producing control system on carbon steel pipe as below:1.Commodity: 3PE Coating L245 ... A53, SS400, Q195-235, Q345(A, B, C), 16Mn, J55, K55, N80, L80, C90, C95, P110, Q1254.Surface treatment ...