Galvanized Steel Tube Shape: hot-dipping galvanized square and rectangular galvanized steel tube, pre-galvanized square and rectangular galvanized steel tube Standard: ASTM A500, ASTM A53, EN10219, BS1387-1985 Material: Q195, Q215, Q235, Q345 Specification: OD:10mm×10mm—-400mm×200mm Wall thickness: 0.6mm-12mm Surface treatment: Hot-dipping galvanized (zinc coated), pre-galvanized, oil coating, lacquering Zinc Coating: 240~600g/m2