Square Pipe and Tubing Square Tube is most commonly used for ornamental fence, gates, greenhouses, OEM projects and more. Our tubing meets ASTM specifications on the wall thickness and outside diameters. Operating 5 tube mills, there is no job to small or large to complete. We can also color-coat or galvanize any size pipe. Outer Diameter 20*10-400*600mm Name Galvanized Steel GI Pipe Wall thickness 0.8-12mm Length 1-12m ,according to customers'requirements, stock is 6m Material Q195, Q215 ,Q235 ,Q345, Q195-Q235 Standard ASTM A500,GBT 6728,GB T 3094 Packing 1)Big OD :in bulk 2)Small OD:packed by steel strips into bundles 3)According to the requirement of the customers. Zinc Coating Pre-:60-150g/m2 Hot Dip Galvanzied:>200g/m2 Ce…