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AZ91A Magnesium vs. SAE-AISI T2 Steel

AZ91A magnesium belongs to the magnesium alloys classification, while SAE-AISI T2 steel belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (13, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.

For each property being compared, the top bar is AZ91A magnesium and the bottom bar is SAE-AISI T2 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
79
Tensile Strength: Ultimate (UTS), MPa 240
780 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 360
250
Melting Completion (Liquidus), °C 600
1820
Melting Onset (Solidus), °C 470
1760
Specific Heat Capacity, J/kg-K 990
410
Thermal Conductivity, W/m-K 73
19
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
46
Density, g/cm3 1.7
9.3
Embodied Carbon, kg CO2/kg material 22
11
Embodied Energy, MJ/kg 160
170
Embodied Water, L/kg 990
98

Common Calculations

Stiffness to Weight: Axial, points 15
12
Stiffness to Weight: Bending, points 69
21
Strength to Weight: Axial, points 38
23 to 64
Strength to Weight: Bending, points 49
20 to 40
Thermal Diffusivity, mm2/s 42
4.9
Thermal Shock Resistance, points 14
23 to 65

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.8 to 0.9
Chromium (Cr), % 0
3.8 to 4.5
Copper (Cu), % 0 to 0.1
0 to 0.25
Iron (Fe), % 0
70.8 to 75.8
Magnesium (Mg), % 88.2 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.2 to 0.4
Molybdenum (Mo), % 0
0 to 1.0
Nickel (Ni), % 0 to 0.030
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.5
0.2 to 0.4
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
17.5 to 19
Vanadium (V), % 0
1.8 to 2.4
Zinc (Zn), % 0.35 to 1.0
0