... , Q345, 20#, A53(A,B), 10#, 16Mn, A106(B,C), 45#, API J55, API K55, St52, Q215, API N80, St37, API ... .Surface Treatment3PE, 3PP,EP and Black PaintingApplicationFluid Pipe, Boiler Pipe, Drill Pipe, Hydraulic Pipe, Gas Pipe, Chemical Fertilizer Pipe, Structure PipePackaging Detailin wooden cases, nylon bags ...