... ,C), 45#, API J55, API K55, St52, Q215, API N80, St37, API L80, API P110, St42, St45, St52.4API 5L A, B, X42, X46, X52, X56 ... .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 ...