1)carbon steel seamless pipes 2)grade:304,304L.316.316L,321 ... ConditionAnnaeled&Pickling,Polished,BA, etc.Applicationpressure vessels, petrochemical industry, boiler,heat exchanger, auto parts, hydraulic system, pharmaceutial machinery, ships, air-conditioning ... refrigeration, electric heating appliance, electronic instrument pipeline,etc. carbon seamless steel pipe