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Alloy series are represented by 4 digits. The most commonly used series start with 2XXX includes copper, 4XXX includes silicon, and 6XXX includes magnesium and silicon. Besides having different material composition, they also have different characteristics. Mechanical properties include density, ductility, workability, corrosion resistance, tensile strength, weldability and density. When the mechanical properties increase, the ability to extrude and surface appearance quality decreases.