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AZ91B Magnesium vs. SAE-AISI T1 Steel

AZ91B magnesium belongs to the magnesium alloys classification, while SAE-AISI T1 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 AZ91B magnesium and the bottom bar is SAE-AISI T1 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
80
Tensile Strength: Ultimate (UTS), MPa 240
770 to 2130

Thermal Properties

Latent Heat of Fusion, J/g 360
240
Melting Completion (Liquidus), °C 600
1810
Melting Onset (Solidus), °C 470
1750
Specific Heat Capacity, J/kg-K 990
410
Thermal Conductivity, W/m-K 73
20
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
45
Density, g/cm3 1.7
9.3
Embodied Carbon, kg CO2/kg material 22
8.2
Embodied Energy, MJ/kg 160
130
Embodied Water, L/kg 990
90

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
5.2
Thermal Shock Resistance, points 14
23 to 64

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.65 to 0.8
Chromium (Cr), % 0
3.8 to 4.5
Copper (Cu), % 0 to 0.35
0 to 0.25
Iron (Fe), % 0
73.2 to 77.2
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.1 to 0.4
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
17.3 to 18.8
Vanadium (V), % 0
0.9 to 1.3
Zinc (Zn), % 0.35 to 1.0
0