... liquid,transport pipe line,machinery part Specifications: 1,Galvanized steel square tube 2,usage:transport liquid,decoration3,Thickness: 0.6- 25mm ... good qualityBrief inroduction: 1 Commodity name Square section steel tube 2 StandardASTM-554,ASTM-249,ASTM-270 SUS3043 Outer Diameter20-457,DN15-DN4504 Wall ... Canada , Chile, Colombia,12 CertificatesSGS,ISO ,CEPRODUCT PHOTO: Square section steel tube