QQ-A-250/4 'T3' Sheet data sheet

Aluminium Alloy | ASTM & FED-QQ

QQ-A-250/4 'T3' Sheet

Commercial2024 BARE

A medium to high strength alloy with, dependent upon temper, minimum Proof Stress up to 57 ksi / 390 Mpa and minimum Tensile Strength up to 66 ksi / 455 MPa

Chemical Composition

SAE AMS QQ A 250/4 Alloy QQ A 250/4
Chemical Element	% Present
Aluminium (Al)	balance
Other (Each)	0.05 max
Chromium (Cr)	0.1 max
Titanium (Ti)	0.15 max
Others (Total)	0.15 max
Titanium + Zirconium (Ti+Zr)	0.2 max
Zinc (Zn)	0.25 max
Silicon (Si)	0.5 max
Iron (Fe)	0.5 max
Manganese (Mn)	0.3 - 0.9
Magnesium (Mg)	1.2 - 1.8
Copper (Cu)	3.8 - 4.9

Alloy Designations

Aluminium alloy QQ-A-250/4 has similarities to the following standard designations and specifications but may not be a direct equivalent:

AMS 4035, Alloy 2024, UNS A92024

Temper Types

Alloy QQ-A-250/4 is supplied in a wide range of tempers:

O
T3
T42
T81
T351
T4
T62
T851
T361
T72
T861

Supplied Forms

Alloy QQ-A-250/4 is supplied in plate and sheet

Plate
Sheet

Generic Physical Properties


Physical Property	Value
Density	2.74 g/cm³
Melting Point	640 °C
Thermal Expansion	23.1 x10^-6 /K
Modulus of Elasticity	73 GPa
Thermal Conductivity	121 W/m.K
Electrical Resistivity	30 % IACS

Mechanical Properties

Properties shown are for the T3 temper

Thickness (mm)	Proof Strength (Min)	Tensile Strength (Min)	Elongation % (Min)
Over 0.2 up to & incl. 0.5	290	434	12
Over 0.5 up to & incl. 3.2	290	434	15
Over 3.2 up to & incl. 6.3	290	441	15

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Last updated 17 January 2014

Disclaimer

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.

Resources

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