Thickness: 0.6- 25 mm Section Shape:Square Usage:for transport liquid,transport pipe line,machinery ... part Specifications: 1,Galvanized steel square tube 2,usage:transport liquid,decoration3,Thickness: 0.6- 25mm 4,Competitive ... price and good qualityBrief inroduction: 1 Commodity name Square section steel tube 2 StandardASTM-554,ASTM-249,ASTM-270 SUS3043 Outer Diameter20 ...