... 2.WT:2mm*80mm 3.OD:18mm*813mm galvanized steel square tube Brand nameSeamless steel pipeConnectionButt-weldingOD18mm-813mm(3/8”-32”)Wall ... A179-CApplicationOil drilling,boiler,precision machines ,petroleum,Chemical,structure pipe,fluid pipe,linepipe etcPackagingExpor packaging :in bundles,Painting ,Beveled edges, ... ’sThe ThirdQality ControlSGS BV LGStandardASTM DIN JIS GB galvanized steel square tube