Aluminum tube is a kind of non-ferrous metal tube. It is a kind of high-strength hard aluminum, which can be strengthened by heat treatment. It has medium plasticity in annealing, rigid quenching and hot state, and good spot welding. When gas welding and argon arc welding are used, the aluminum tube has the tendency to form intergranular cracks; The machinability of aluminum tubes after quenching and cold work hardening is good, but it is poor in the annealed state. The corrosion resistance is not high. Anodic oxidation treatment and painting methods or aluminum coating on the surface are often used to improve the corrosion resistance. It can also be used as mold material.