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A high-strength hard aluminum, heat treatment can be strengthened, in the annealed, just quenched and hot state plasticity is medium, spot welding weldability is good, with gas welding and argon arc welding aluminum tube has the tendency to form intergranular cracks; aluminum tube in the quenching and cold hardening machinability is still good, in the annealed state bad. Corrosion resistance is not high, often using anodic oxidation treatment and painting methods or surface cladding aluminum layer to improve corrosion resistance. It can also be used as mold material.