3A21 aluminum plate is al-mn alloy, 3A21 aluminum plate is the most widely used a kind of antirust aluminum, the strength is not high (only slightly higher than the industrial pure aluminum), can not heat treatment enhancement, 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 plate is mainly used for demanding high plasticity and good weldability, such as aerospace, military equipment, jig, automobile, transportation, production of propellant storage tank, welding structure cabin body of the skin, end frame, support and other welding parts, and work in corrosive medium of the conduit.