Aluminum square pipe, especially without stress corrosion cracking tendency, has excellent weldability, corrosion resistance and cold working property, which is a kind of widely used pipe A promising alloy. It can be anodized and colored, or painted with enamel, which is suitable for building decoration materials. It contains a small amount of Cu, so its strength is higher than that of 6063, but its quenching sensitivity is also higher than that of 6063. After extrusion, it cannot be air quenched. It needs to be re solution treated and quenched and aged to obtain higher strength.
