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ACI-ASTM CE8MN Steel vs. AZ91B Magnesium

ACI-ASTM CE8MN steel belongs to the iron alloys classification, while AZ91B magnesium belongs to the magnesium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (6, 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 ACI-ASTM CE8MN steel and the bottom bar is AZ91B magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
46
Elongation at Break, % 29
5.0
Fatigue Strength, MPa 370
79
Poisson's Ratio 0.27
0.29
Shear Modulus, GPa 80
18
Tensile Strength: Ultimate (UTS), MPa 750
240
Tensile Strength: Yield (Proof), MPa 500
160

Thermal Properties

Latent Heat of Fusion, J/g 300
360
Maximum Temperature: Mechanical, °C 1100
130
Melting Completion (Liquidus), °C 1440
600
Melting Onset (Solidus), °C 1400
470
Specific Heat Capacity, J/kg-K 480
990
Thermal Conductivity, W/m-K 16
73
Thermal Expansion, µm/m-K 13
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.2
11
Electrical Conductivity: Equal Weight (Specific), % IACS 2.5
58

Otherwise Unclassified Properties

Base Metal Price, % relative 21
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 4.2
22
Embodied Energy, MJ/kg 58
160
Embodied Water, L/kg 180
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
11
Resilience: Unit (Modulus of Resilience), kJ/m3 620
280
Stiffness to Weight: Axial, points 15
15
Stiffness to Weight: Bending, points 25
69
Strength to Weight: Axial, points 27
38
Strength to Weight: Bending, points 23
49
Thermal Diffusivity, mm2/s 4.2
42
Thermal Shock Resistance, points 21
14

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.080
0
Chromium (Cr), % 22.5 to 25.5
0
Copper (Cu), % 0
0 to 0.35
Iron (Fe), % 56 to 66.4
0
Magnesium (Mg), % 0
87.9 to 91.2
Manganese (Mn), % 0 to 1.0
0.13 to 0.5
Molybdenum (Mo), % 3.0 to 4.5
0
Nickel (Ni), % 8.0 to 11
0 to 0.030
Nitrogen (N), % 0.1 to 0.3
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.5
0 to 0.5
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0.35 to 1.0