3A21 aluminum bar is al-mn alloy, 3A21 aluminum bar is the most widely used anti-rust aluminum, the strength is not high (only slightly higher than the industrial pure aluminum), can not be strengthened by heat treatment, so cold processing method is often used to improve its mechanical properties;High plasticity in annealing, good plasticity in semi-cold hardening, low plasticity in cold hardening, good corrosion resistance, good weldability, poor machinability.

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3A21 aluminum bar is mainly used for high plasticity and good weldability, such as aerospace, military equipment, jig, automobile, transportation, production of propellant storage tank, welding of the skin, end frame, bracket and other welding parts of the structural cabin, as well as working in corrosive media of the conduit.