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Strength in numbers

Aluminium Alloy   |   ASTM & FED-QQ

QQ-A-250/12 T651 Plate

Commercial7075

A high strength aerospace aluminium alloy with, depending upon temper, Yield Strength of up to 54ksi (370 MPa) and Tensile Strength of up to 67 ksi (460 MPa)


Chemical Composition

SAE AMS QQ-A-250/12
Alloy QQ A 250/12
Chemical Element % Present
Aluminium (Al) balance
Other (Each) 0.05 max
Others (Total) 0.15 max
Titanium (Ti) 0.2 max
Chromium (Cr) 0.18 - 0.28
Manganese (Mn) 0.3 max
Silicon (Si) 0.4 max
Iron (Fe) 0.5 max
Copper (Cu) 1.2 - 2
Magnesium (Mg) 2.1 - 2.9
Zinc (Zn) 5.1 - 6.1

Alloy Designations

Aluminium alloy QQ-A-250/12 has similarities to the following standard designations and specifications but may not be a direct equivalent:

AMS 4044, Alloy 7075, UNS A97075


Temper Types

Alloy QQ-A-250/12 is supplied in a wide range of tempers:

  • O
  • T351
  • T6
  • T62
  • T651
  • T6510
  • T73
  • T7351

Supplied Forms

Alloy QQ-A-250/12 T651 is supplied in sheet and plate

  • Sheet
  • Plate

Generic Physical Properties

Physical Property Value
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

Mechanical Properties

The Mechanical Properties given are for Plate in the T651 temper

Thickness (mm) Proof Strength (Min) Tensile Strength (Min) Elongation % (Min)
Over 6.3 up to & incl. 12.6 462 538 9
12.7 up to & incl. 25.4 469 538 7
Over 25.4 up to & incl. 50.8 462 531 6
Over 50.8 up to & incl. 63.5 441 524 5
Over 63.5 up to & incl. 76.2 421 496 5
Over 76.2 up to & incl. 88.9 400 490 5
Over 88.9 up to & incl. 101.6 372 462 3