ALUMINUM 6061

PRINCIPAL DESIGN FEATURES
Probably the most commonly available, heat-treatable aluminum alloy.

APPLICATIONS
Commonly used in the manufacture of heavy-duty structures requiring good corrosion resistance, truck and marine components, railroad cars, furniture, tank fittings, general structural and high-pressure applications, wire products, and pipelines.

MACHINABILITY
The machinability in the harder T4 and T6 tempers is good. It is notably less easy to machine in the annealed temper.

FORMING
Easily cold worked and formed in the annealed condition. Stamping, bending, spinning, and deep drawing are all readily accomplished using standard methods.

WELDING
The alloy has very good welding characteristics and may be welded by all of the common welding techniques. Gas tungsten arc welding is generally used for thin sections (less than 0.032″) and gas metal arc welding is used for heavier sections. Use alloy 4043 filler wire for best results, although a decrease in T 6 properties will result.

HEAT TREATMENT
Solution heat treated at 990 F for adequate time to allow for thorough heating and then water quench. Precipitation hardening is done at 320 F for 18 hours and air cooling, followed by 350 F for 8 hours and air cooling.

FORGING
The alloy is capable of being hot forged at temperatures in the range of 900 F to 750 F.

HOT WORKING
Hot working may be done in the temperature range of 700 F to 500 F.

COLD WORKING
Cold working in the O-temper condition is readily performed. The alloy is notably less easy to cold form in the T 4 and T 6 tempers.

ANNEALING
Annealing should be done at 775 F for 2 to 3 hours followed by controlled cooling at 50 f per hour down to 500 F, then air cooling.

AGING
The aging precipitation heat treatment is done at 350 F for 8 hours followed by air cooling. This produces the T6 temper.

TEMPERING
Not applicable.

HARDENING
See “Aging”.

OTHER PHYSICAL PROPERTIES
Electrical conductivity 40% of copper.

OTHER MECHANICAL PROPERTIES
Shear strength for O temper is 12 ksi and for T6 temper it is 30, ksi
Density: 0.098
Specific Gravity: 2.7
Melting Point: 1090
MoETensile: 10
MoETorsion: 3.8

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