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Strength in numbers

Aluminium Alloy   |   ASTM & FED-QQ

QQ-A-250/4 '0' 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:

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 193 W/m.K
Electrical Resistivity 50.5 % IACS

Mechanical Properties

SAE AMS QQ-A-250/4
Sheet -
Mechanical Property Value
Proof Stress 97 Min MPa
Tensile Strength 221 Min MPa
Elongation A50 mm 12 Min %

Mechanical Properties shown are for '0' temper in thicknesses over 0.2mm up to and including 12.6mm