What is the 3A21 aluminum sheet?

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The 3A21 aluminum sheet is a kind of widely used anti rust aluminum, the intensity is not high (only slightly higher than that of pure aluminum), can be strengthened by heat treatment, so we often use cold processing methods to improve its mechanical properties; in the annealed state have high plasticity, in the semi cold hardening plastic is good, when the low plasticity of cold hardening, good corrosion resistance, good weld ability, poor machine ability. The 3A21 aluminum sheet has many advantages, first, 3A21 aluminum sheet is a typical antirust aluminum, with excellent corrosion resistance, can adapt to the humid environment; Second, it has good weld ability, good tensile strength, elongation is better than 3003 aluminum plate 25%; Third, it has smooth surface, good plasticity, pressure resistance。