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AZ91B Magnesium vs. SAE-AISI S4 Steel

AZ91B magnesium belongs to the magnesium alloys classification, while SAE-AISI S4 steel belongs to the iron alloys. There are 23 material properties with values for both materials. Properties with values for just one material (10, 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 S4 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
72
Tensile Strength: Ultimate (UTS), MPa 240
670 to 2140

Thermal Properties

Latent Heat of Fusion, J/g 360
280
Melting Completion (Liquidus), °C 600
1430
Melting Onset (Solidus), °C 470
1390
Specific Heat Capacity, J/kg-K 990
480
Thermal Conductivity, W/m-K 73
44
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 11
7.4
Electrical Conductivity: Equal Weight (Specific), % IACS 58
8.7

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.2
Density, g/cm3 1.7
7.7
Embodied Carbon, kg CO2/kg material 22
2.0
Embodied Energy, MJ/kg 160
29
Embodied Water, L/kg 990
48

Common Calculations

Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 69
25
Strength to Weight: Axial, points 38
24 to 77
Strength to Weight: Bending, points 49
22 to 48
Thermal Diffusivity, mm2/s 42
12
Thermal Shock Resistance, points 14
20 to 65

Alloy Composition

Aluminum (Al), % 8.3 to 9.7
0
Carbon (C), % 0
0.5 to 0.65
Chromium (Cr), % 0
0.1 to 0.5
Copper (Cu), % 0 to 0.35
0
Iron (Fe), % 0
95.2 to 96.9
Magnesium (Mg), % 87.9 to 91.2
0
Manganese (Mn), % 0.13 to 0.5
0.6 to 1.0
Nickel (Ni), % 0 to 0.030
0
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.5
1.8 to 2.3
Sulfur (S), % 0
0 to 0.030
Vanadium (V), % 0
0.15 to 0.35
Zinc (Zn), % 0.35 to 1.0
0