Aluminium Alloy - ASTM & FED-QQ - QQ-A-200/11 T6511 Bar

QQ-A-200/11 T6511 Bar

A very high strength aerospace aluminium alloy with, depending upon temper, Yield Strength of 24-68 ksi (165 - 465 MPa) and Tensile Strength of 40-78 ksi (275 - 540 MPa).
This alloy is used where high strength is required and where good resistance to general corrosion is NOT important.

Chemical Composition

Spec: SAE AMS QQ-A-200/11

Alloy QQ A 200/11

Chemical Element % Present
Silicon (Si) 0.0 - 0.40
Iron (Fe) 0.0 - 0.50
Copper (Cu) 1.20 - 2.00
Manganese (Mn) 0.0 - 0.30
Chromium (Cr) 0.18 - 0.28
Magnesium (Mg) 2.10 - 2.90
Zinc (Zn) 5.10 - 6.10
Titanium (Ti) 0.0 - 0.20
Other (Each) 0.0 - 0.05
Others (Total) 0.0 - 0.15
Aluminium (Al) Balance


Physical PropertyValue
Density 2.81 g/cm³
Melting Point 635 °C
Thermal Expansion 23.5 x10^-6 /K
Modulus of Elasticity 72 GPa
Thermal Conductivity 134-160 W/m.K
Electrical Resistivity 40 % IACS
'Typical' Physical Properties are given

Alloy Designations

Aluminium alloy QQ-A-200/11 has similarities to the following standard designations and specifications but may not be a direct equivalent:

AMS 4166, AMS 4168, AMS 4169

Temper Types

Alloy QQ-A-200/11 is supplied in a wide range of tempers:

  • O - Soft
  • T6 - Solution heat treated and artificially aged
  • T62 - Solution heat treated then artificially aged by the user
  • T6510 - Solution heat treated and stress-relieved by stretching then artificially aged with no straightening after aging
  • T6511 - Solution heat treated and stress-relieved by stretching then artificially aged with minor straightening after aging
  • T73 - Solution heat treated then specially artificially aged for resistance to stress corrosion
  • T7310
  • T7311
  • T8511 - Solution heat treated, stress-relieved by stretching then artificially aged
  • T7351 - Solution heat treatment then specially artifically aged for resistance to stress corrosion.
  • T73511

Supplied Forms

Alloy QQ-A-200/11 T6511 is supplied in extruded bar

  • Bar
  • Extrusions

Mechanical Properties

These Mechanical Properties are for Bar in the T6511 temper

Diameter (mm)Proof Strength (Min)Tensile Strength (Min)Elongation % (Min)
Up to & incl. 6.34825387
Over 6.3 up to & incl. 12.75035587
Over 12.7 up to & incl. 76.2 4965587
Over 76.2 up to & incl. 1144895587
Over 114 up to & incl. 1274695386
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Last Datasheet Revision

18 July 2019


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.