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Strength in numbers

Aluminium Alloy   |   ASTM & FED-QQ

QQ-A-250/13 'O' Sheet

Commercial7075 CLAD

A high strength aerospace aluminium alloy in the fully soft condition


Chemical Composition

SAE AMS QQ-A-250/13
Alloy QQ A 250/13
Chemical Element % Present
Aluminium (Al) balance
Other (Each) 0.05 max
Others (Total) 0.15 max
Titanium (Ti) 0.2 max
Manganese (Mn) 0.3 max
Chromium (Cr) 0.18 - 0.35
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-250/13 has similarities to the following standard designations and specifications but may not be a direct equivalent:

AMS 4049, AMS4278, Alloy 7075, UNS A97075


Temper Types

Alloy QQ-A-250/13 CLAD SHEET is supplied in a range of tempers including fully soft

  • O
  • T6

Supplied Forms

Alloy QQ-A-250/13 is supplied in CLAD sheet and plate

  • Sheet
  • Plate

Generic Physical Properties

Physical Property Value
Density 2.71 g/cm³
Melting Point 635 °C
Thermal Expansion 23.5 x10^-6 /K
Modulus of Elasticity 72 GPa
Thermal Conductivity 75 W/m.K
Electrical Resistivity 45.5 % IACS

Mechanical Properties

These are for sheets in the 'O' temper

Thickness (mm) Proof Strength (Min) Tensile Strength (Min) Elongation % (Min)
Over 0.2 up to & incl. 0.3 138 248 9
Over 0.3 up to & incl. 1.5 138 248 10
Over 1.6 up to & incl. 4.7 138 262 10