... ,XXS sch5s, sch20s, sch40s, sch80s,SGP.LengthSample 6~12m or as the clients' requirementSurface Galvanized or black paintingStandardsASTM A53 , ASTM A106 ... Some of you need also can as the clients' requirement ApplicationFluid, gas, transport, drill,hydraulic, oil Structural , boiler, heat exchanger, super heater