Strength in numbers

Aluminium Alloy   |   ASTM & FED-QQ

QQ-A-225/6 T351 Bar

AerospaceQQ-A-225/6 T351 Commercial2024

A medium to high strength alloy with, dependent upon temper, minimum Proof Stress up to 58 ksi / 400 Mpa and minimum Tensile Strength up to 66 ksi / 455 MPa

Chemical Composition

SAE AMS QQ-A-225/6
Alloy QQ A 225/6
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-225/6 has similarities to the following standard designations and specifications but may not be a direct equivalent:

AMS 4120, Alloy 2024, UNS A92024

Temper Types

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

  • O
  • T42
  • T8510
  • T8511
  • T4
  • T6
  • T62
  • T351
  • T36
  • T851

Supplied Forms

Alloy QQ-A-200/3 is supplied in Bar, Rod and Wire

  • Bar

Generic Physical Properties

Physical Property Value
Density 2.79 g/cm³
Melting Point 640 °C
Thermal Expansion 23.1 x10^-6 /K
Modulus of Elasticity 73 GPa
Thermal Conductivity 121-150 W/m.K
Electrical Resistivity 30-40 % IACS
'Typical' Physical Properties are given

Mechanical Properties

SAE AMS QQ-A-225/6
Bar - 12.7mm to 165.1mm
Mechanical Property Value
Proof Stress 310 MIN MPa
Tensile Strength 427 Min MPa
Elongation A50 mm 10 Min %

These Mechanical Properties apply to Bar in the T351 temper in diameters 12.7mm to 165mm