EN755 Aluminium Alloy 6061 flange fitting.pdf

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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 Aluminium
6061 Aluminium is, by most any measure, the most commonly used Aluminium 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 Aluminium are magnesium and silicon.

Principal Design Features
Probably the most commonly available, heat treatable Aluminium 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 Aluminium
Physical and Mechanical PropertiesUltimate Tensile Strength, psi45,000
Yield Strength, psi40,000
Brinell Hardness95
Rockwell HardnessB60
ChemistryAluminium (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%


Aluminium 6061
Chemistry Data
Chromium0.04 - 0.35
Copper0.15 - 0.4
Iron0 - 0.7
Magnesium0.8 - 1.2
Manganese0.15 max
Other0.15 max
Remainder Each0.05 max
Silicon0.4 - 0.8
Titanium0.15 max
Zinc0.25 max
Physical Data
Density (lb / cu. in.)0.098
Specific Gravity (kg/m3)2.70
Melting Point (Deg F)1090
Modulus of Elasticity Tension10
Modulus of Elasticity Torsion3.8


Some of 6061 products


aluminum 6061 coupling


aluminum 6061 cross


aluminum 6061 stub end


aluminum 6061 cap


aluminum 6061 elbow


aluminum 6061 reducer

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