Aluminum Square Tube, is an extruded aluminum that is widely used for all types of fabrication projects where lightweight and corrosion resistance is a primary concern - frame work, support columns, gates, fencing, handrails, etc. Aluminum Square Tube has square corners inside and outside, with no weld seam. In particular, it has no tendency to stress corrosion cracking, and has excellent weldability, corrosion resistance and cold workability. It is a promising alloy with a wide range of applications. It can be anodized and colored, or painted with enamel, which is suitable for building decoration materials.