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Strength in numbers

Aluminium Alloy   |   ASTM & FED-QQ

QQ-A-250/12 T7351 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

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:

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 T7351 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 T7351 temper

Thickness (mm) Proof Strength (Min) Tensile Strength (Min) Elongation % (Min)
Over 6.3 up to & incl. 25.4 393 476 7
Over 25.4 up to & incl. 50.8 393 476 6
Over 50.8 up to & incl. 63.5 359 455 6
Over 63.5 up to & incl. 76.2 338 441 6
Over 76.2 up to & incl. 88.9 338 434 6
Over 88.9 up to & incl. 101.6 331 421 6