Hot dip galvanized square tube *Dimensions:10x20-400x600/ 10x10-400x400 *Hot sale rice *Fast delivery time Hot dip galvanized square tube 1.Materia ... 3.Zinc coated: 60-120 g/m2ASTM A500 Galvanized square tubeStandardASTM , GB , BS , JISMaterialQ195 , Q215 , ... Q235 , Q345Section shapeRound , Square, RectangularOuter diameter20 * 20 – 300 * 300mmThickness0.7-2 ...