aluminium 6061 is a precipitation hardened aluminium alloy, containing magnesium and silicon as its major alloying elements.  It has good mechanical properties, exhibits good weldability, and is very commonly extruded (second in popularity only to 6063). It is one of the most common alloys of aluminium for general-purpose use.

It is commonly available in pre-tempered grades such as 6061-O (annealed), tempered grades such as 6061-T6 (solutionized and artificially aged) and 6061-T651 (solutionized, stress-relieved stretched and artificially aged).

aluminum 6061  can be processed into varieties of tempers, such as O, T4, T6, T651, etc. Among them, T4 and T6 are the most common ones for their good machanicability and weldability. Therefore, it is generally used industrial structure frame, which requires high anti-correction, such as truck, construction, ships, trolley bus, railway transit, etc.