belongs to Al-Mg-Si alloy with medium strength, good plasticity and excellent corrosion resistance. Especially, it has no stress corrosion cracking tendency. It has good weldability, corrosion resistance and cold workability. It is a promising alloy with a wide range of applications. It can be colored by anodic oxidation or painted with enamel, which is suitable for building decoration materials. It contains a small amount of copper, so its strength is higher than , but its quenching sensitivity is also higher than 6063. After extrusion, it can not be quenched by air. It needs re-solution treatment and quenching aging to obtain higher strength.
