Magnesium QE22A-T6 Alloy (UNS M18220)

Topics Covered

Chemical Composition
Physical Properties
Mechanical Properties
Thermal Properties
Other Designations


Magnesium is a strong, silvery-white, light-weight metal that tarnishes slightly when exposed to air. Magnesium QE22A-T6 alloy is a casting alloy having excellent tensile, fatigue and creep properties at elevated and room temperatures. It is weldable and pressure tight.

The following datasheet gives an overview of magnesium QE22A-T6 alloy.

Chemical Composition

The following table shows the chemical composition of magnesium QE22A-T6 alloy.

Element Content (%)
Magnesium, Mg 95
Silver, Ag 2-3
Neodymium, Nd 1.7 - 2.5
Zirconium, Zr 0.40 - 1
Copper, Cu ≤ 0.10
Nickel, Ni ≤ 0.010

Physical Properties

The physical properties of magnesium QE22A-T6 alloy are given in the following table.

Properties Metric Imperial
Density 1.82 g/cm³ 0.0658 lb/in³

Mechanical Properties

The mechanical properties of cast magnesium QE22A-T6 alloy are listed in the following table.

Properties Metric Imperial
Tensile strength 260 MPa 37700 psi
Yield strength (@ strain 0.2%) 195 MPa 28300 psi
Compressive yield strength (at 0.2% offset) 195 MPa 28300 psi
Compressive strength 193 MPa 28000 psi
Fatigue strength (@# of cycles 1.00e+7/ 250°C) 53 MPa 7690 psi
Shear strength 160 MPa 23200 psi
Shear modulus 17 GPa 2470 ksi
Compressive modulus 44 GPa 6380 ksi
Elastic modulus 45 GPa 6530 ksi
Poisson's ratio 0.35 0.35
Elongation at break (in 50 mm) 3% 3%
Brinell hardness (500 kg load, 10 mm ball) 80 80
Knoop hardness (estimated from Brinell) 103 103
Rockwell B hardness (estimated from Brinell) 49 49
Vickers hardness (estimated from Brinell) 90 90
Machinability (relative rating, 100=best) 100 100

Thermal Properties

The following table outlines the thermal properties of magnesium QE22A-T6 alloy.

Properties Metric Imperial
Thermal expansion co-efficient (@ 0-100°C/32-212°F) 26.7 µm/m°C 14.8 µin/in°F
Thermal conductivity 113 W/mK 784 BTU in/hr.ft².°F

Other Designations

Other designations that are equivalent to magnesium QE22A-T6 alloy include:

  • EN 1753
  • MC65210
  • AMS 4418
  • ASTM B 80
  • ASTM B 199
  • ASTM B 403


Magnesium QE22A-T6 alloy is typically used for commercial and military sand and permanent mold castings with high yield strengths at temperatures up to 200°C (392°F). It is widely used in aerospace applications.

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