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6061 Aluminum Specification

6061 - alloyed with 1.0% magnesium and 0.6% silicon. Good formability, weldability and corrosion resistance. Very good machine-ability Yield between 7,000 to 39,000 psi

6061 Aluminum
6061 Aluminum is, by most any measure, the most commonly used aluminum alloy. It is specified in most any application due to its strength, heat treatability, comparatively easy machining, and weldability. If that were not enough, it is also capable of being anodized, adding a layer of protection for finished parts. The main alloy ingredients of 6061 aluminum are magnesium and silicon.

Principal Design Features
Probably the most commonly available, heat treatable aluminum alloy.

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 in pipelines.

Machinability in the harder T 4 and T6 tempers is good. It is notably less easy to machine in the annealed temper.

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

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 treat 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 cool, followed by 350 F for 8 hours and air cooling.

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 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 cool.

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

Other Physical Props
Electrical conductivity 40% of copper.

Other Mechanical Props
Shear strength for O temper is 12 ksi and for T 6 temper it is 30, ksi

6061-T6 Aluminum
Physical and Mechanical Properties Ultimate Tensile Strength, psi 45,000
Yield Strength, psi 40,000
Brinell Hardness 95
Rockwell Hardness B60
Chemistry Aluminum (Al) 95.8 - 98.6%
Chromium (Cr) 0.04 - 0.35%
Copper (Cu) 0.15 - 0.40%
Iron (Fe) 0.70%
Magnesium (Mg) 0.8 - 1.2%
Manganese (Mn) 0.15% max
Silicon (Si) 0.4 - 0.8%
Zinc (Zn) 0.25%

Aluminum 6061
Chemistry Data
Aluminum Balance
Chromium 0.04 - 0.35
Copper 0.15 - 0.4
Iron 0 - 0.7
Magnesium 0.8 - 1.2
Manganese 0.15 max
Other 0.15 max
Remainder Each 0.05 max
Silicon 0.4 - 0.8
Titanium 0.15 max
Zinc 0.25 max
Physical Data
Density (lb / cu. in.) 0.098
Specific Gravity 2.7
Melting Point (Deg F) 1090
Modulus of Elasticity Tension 10
Modulus of Elasticity Torsion 3.8

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UNS N10276 C-276 2.4819 Nickel Alloy Seamless Tubing
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