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Data Sheets

Aluminium Alloy


2L77 T6

High strength structural components: aircraft (e.g. fittings and wheels), military vehicles and bridges, forgings for trucks and machinery (hydraulic etc.). Weapons manufacture, structural applications.

Characteristic Properties:
Heat treatable alloy. High mechanical strength slightly higher than 2011 and 2017A.

Chemical Composition

BS 2L77(1971)
Alloy 2L77
Chemical Element % Present
Manganese (Mn) 0.40 - 1.20
Chromium (Cr) 0.0 - 0.10
Iron (Fe) 0.0 - 0.50
Tin (Sn) 0.0 - 0.05
Zinc (Zn) 0.0 - 0.20
Magnesium (Mg) 0.20 - 0.80
Copper (Cu) 3.90 - 5.00
Titanium + Zirconium (Ti+Zr) 0.0 - 0.20
Silicon (Si) 0.50 - 0.90
Nickel (Ni) 0.0 - 0.20
Lead (Pb) 0.0 - 0.05
Aluminium (Al) Balance

Alloy Designations

Aluminium alloy 2L77 - 2014A is covered by standard BS EN 4L77 (1971)

Generic Physical Properties

Physical Property Value
Density 2.80 g/cm³
Melting Point 640 °C
Thermal Expansion 22.8 x10^-6 /K
Modulus of Elasticity 73 GPa
Thermal Conductivity 134-155 W/m.K
Solution treat by heating at a temp of 500C +/- 5C and quenching in water at a temperature not less than 40C nor more than 70C, unless otherwise agreed by the parent design firm and the manufacturer. If a water quenching temperature below 40 C is used, high residual stress and cracking may result, particularly in large and / or complicated forgings. For this reason it is desirable to quench in water at as high a temperature as is practible.

Mechanical Properties

BS 2L77(1971)
Mechanical Property Value
Elongation A50 mm 6 Min %
Hardness Brinell 134 Min HB
Proof Stress 395 Min MPa
Tensile Strength 450 Min MPa


This Data is indicative only and as such is not to be relied upon in place of the full specification. In particular, mechanical property requirements vary widely with temper, product and product dimensions. All information is based on our present knowledge and is given in good faith. No liability will be accepted by the Company in respect of any action taken by any third party in reliance thereon.

Please note that the 'Datasheet Update' date shown above is no guarantee of accuracy or whether the datasheet is up to date.

The information provided in this datasheet has been drawn from various recognised sources, including EN Standards, recognised industry references (printed & online) and manufacturers’ data. No guarantee is given that the information is from the latest issue of those sources or about the accuracy of those sources.

Material supplied by the Company may vary significantly from this data, but will conform to all relevant and applicable standards.

As the products detailed may be used for a wide variety of purposes and as the Company has no control over their use; the Company specifically excludes all conditions or warranties expressed or implied by statute or otherwise as to dimensions, properties and/or fitness for any particular purpose, whether expressed or implied.

Advice given by the Company to any third party is given for that party’s assistance only and without liability on the part of the Company. All transactions are subject to the Company’s current Conditions of Sale. The extent of the Company’s liabilities to any customer is clearly set out in those Conditions; a copy of which is available on request.