1/4''-24'',13mm-610mm,carbon steel pipe welded pipe galvanized pipe, seamless steel pipe spiral steel pipe alloy pipe Typecarbon steel pipe welded pipe galvanized pipe, seamless steel pipe spiral steel pipe alloy pipe StandardASTM A106 GRB/API5LGRB/ASTMA53GRB ... wear-resisting ,aging resistant , service life is long, high security, highly pressurized, widely usedMin order3 tons galvanized steel pipe