6063 is often called architectural Aluminium for two reasons - first, it has a surface finish that is far smoother than the other commercially available alloys, and second, its strength is significantly less (roughly half the strength of 6061), making it suited for applications where strength is not the foremost consideration. 6063 is rated as "Good" for forming and cold working operations, "Excellent" for anodizing, and "Fair" for machining.

General Information
Principal Design Features
This is generally considered to be an extrusion alloy that is heat treatable for strengthening.

Commonly used in the manufacture of furniture, windows, stair rails, and in pipe railing. Commonly used in architectural extrusions.

Machinability is considered to be average for this alloy.

Forming ability, either hot or cold, is good.

The alloy is readily welded by all of the conventional methods. Filler rod should be of the same alloy or AL 4043 alloy.

Heat Treatment
Solution heat treat at 970°F for 1 hour followed by water quench. This produces T 4 temper. Other tempers are accomplished by aging.

Hot forging may be done in the range of 500°F to 950°F.

Hot Working
Hot working, as with forging, may be done at temperatures above 500°F up to maximum of 950°F.

Cold Working
Cold working characteristics are good for all conventional forming methods.

Anneal at 775°F for 3 hours and use controlled cooling at rate of 50°F per hour down to 500°F. Then air cool.

Aging is done at a temperature of 350°F for 8 hours for T 6 and T 62 tempers. Age at 360°F for 3 hours to get T5 temper.

Hardens due to aging heat treatment and cold working. See "Aging".

Other Physical Props
Electrical conductivity 50% of copper.

Other Mechanical Props
Shear strength for various tempers is: O temper 10, ksi . T 5 temper 17 ksi. T 83 temper 22 ksi


6063 Aluminium
Minimum PropertiesUltimate Tensile Strength, psi27,000
Yield Strength, psi21,000
Brinell Hardness60
Chemical CompositionAluminium (Al)97.5% max
Chromium (Cr)0.1% max
Copper (Cu)0.1% max
Iron (Fe)0.35% max
Magnesium (Mg)0.45 - 0.90%
Manganese (Mn)0.1% max
Silicon (Si)0.2 - 0.6%


Aluminium 6063
Chemical Composition
Chromium0.1 max
Copper0.1 max
Iron0.35 max
Magnesium0.45 - 0.9
Manganese0.1 max
Remainder Each0.05 max
Remainder Total0.15 max
Silicon0.2 - 0.6
Titanium0.1 max
Zinc0.1 max
Physical Data
Density (lb /in.³)0.097
Specific Gravity (kg/m³)2.70
Melting Point (°F)1150
Modulus of Elasticity Tension10
Modulus of Elasticity Torsion3