... .Spec.:A500,Q195,Q235,Q345 (16Mn) Galvanized square tube Size 10*10-600*600mm W.T0.6-20mm ... Technique Welded, Cold drawn, Hot rolled, Necking. Packing 1.Big OD: in bulk.2.Small OD: In bundles by ... ", wall thickness from 0.6mm to 12mm;Square steel tube: 10x10-600x600mm, wall thickness from 0.6mm to 20mm ... ; Rectangular tube: 10x20-350x400mm, wall thickness from 0.6mm to ...