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Strength in numbers

Aluminium Alloy   |   ASTM & FED-QQ

QQ-A-200/3 T3 Bar

Commercial2024

A high strength alloy with, dependent upon temper, minimum Proof Stress up to 56 ksi / 385 Mpa and minimum Tensile Strength up to 70 ksi / 482 MPa


Chemical Composition

SAE AMS QQ-A-200/3
Alloy QQ-A-200/3
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
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-200/3 has similarities to the following standard designations and specifications:

AMS 4164, AMS 4165


Temper Types

Alloy QQ-A-200/3 is supplied in a range of tempers:

  • T3
  • T8511
  • T3511

Supplied Forms

Alloy QQ-A-200/3 is supplied as Extruded Bar

  • Bar
  • Extrusions

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 121 W/m.K
Electrical Resistivity 30 % IACS

Mechanical Properties

These apply to QQ-A-200/3 bar in the T3 temper

Diameter (mm) Proof Strength (Min) Tensile Strength (Min) Elongation % (Min)
Up to & incl. 6.25mm 290 393 12
Over 6.3mm up to & incl. 19mm 303 414 12
Over 19mm up to & incl. 38mm 317 448 10
Over 38mm 358 483 10