Aluminium alloy 6063 is a medium strength alloy commonly referred to as an architectural alloy. It is normally used in intricate extrusions.
It has a good surface finish, high corrosion resistance, is readily suited to welding and can be easily anodised. Most commonly available as T6 temper, in the T4 condition it has good formability.

Similar to aluminum 6061, 6063 aluminum alloy counts silicon and magnesium as its alloying elements. Aluminum 6063 is widely recognized for its weldability and heat treatability, as well as for its ability to resist corrosion. The uses of aluminum 6063 are not typically as general as 6061, with its primary uses falling within the interior and exterior architectural application fields. Another valuable characteristic of aluminum 6063 is its successful use for aluminum extrusion. This alloy makes possible the creation of complex shapes with smooth surfaces, that can be used for visible elements of premium casework, angles, corners, coves, out corners, bar & face nosing, and architectural trim. In addition to being used for window frames, door frames, roofs, and signage, aluminum 6063 is also used for the fabrication of pipes and tubing, as well as for furniture applications. The specific mechanical properties of aluminum 6063 vary depending on the temper.

Applications
6063 is typically used in:
Architectural applications
Extrusions
Window frames
Doors
Shop fittings
Irrigation tubing
In balustrading the rails and posts are normally in the T6 temper and formed elbows and bends are T4. T4 temper 6063 aluminium is also finding applications in hydroformed tube for chassis.

Aluminium Alloy 6063A
Aluminium alloy 6063A is a variation of 6063 with greater strength but retains the same good surface finish qualities and affinity for anodising.

Applications
6063A is used in the same applications as 6063. It is also used in:
Road transport
Rail transport
Extreme sports equipment