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SAE-AISI T8 Steel vs. ZK51A Magnesium

SAE-AISI T8 steel belongs to the iron alloys classification, while ZK51A magnesium belongs to the magnesium alloys. There are 21 material properties with values for both materials. Properties with values for just one material (11, 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 SAE-AISI T8 steel and the bottom bar is ZK51A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 78
18
Tensile Strength: Ultimate (UTS), MPa 780 to 2140
240

Thermal Properties

Latent Heat of Fusion, J/g 250
340
Melting Completion (Liquidus), °C 1730
640
Melting Onset (Solidus), °C 1670
550
Specific Heat Capacity, J/kg-K 420
970
Thermal Conductivity, W/m-K 18
110
Thermal Expansion, µm/m-K 12
26

Otherwise Unclassified Properties

Base Metal Price, % relative 45
13
Density, g/cm3 9.0
1.8
Embodied Carbon, kg CO2/kg material 10
24
Embodied Energy, MJ/kg 160
160
Embodied Water, L/kg 120
940

Common Calculations

Stiffness to Weight: Axial, points 12
14
Stiffness to Weight: Bending, points 22
64
Strength to Weight: Axial, points 24 to 66
36
Strength to Weight: Bending, points 21 to 41
47
Thermal Diffusivity, mm2/s 4.8
61
Thermal Shock Resistance, points 24 to 66
15

Alloy Composition

Carbon (C), % 0.75 to 0.85
0
Chromium (Cr), % 3.8 to 4.5
0
Cobalt (Co), % 4.3 to 5.8
0
Copper (Cu), % 0 to 0.25
0 to 0.1
Iron (Fe), % 69.3 to 75.4
0
Magnesium (Mg), % 0
93.1 to 95.9
Manganese (Mn), % 0.2 to 0.4
0
Molybdenum (Mo), % 0.4 to 1.0
0
Nickel (Ni), % 0 to 0.3
0 to 0.010
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0.2 to 0.4
0
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 13.3 to 14.8
0
Vanadium (V), % 1.8 to 2.4
0
Zinc (Zn), % 0
3.6 to 5.5
Zirconium (Zr), % 0
0.5 to 1.0
Residuals, % 0
0 to 0.3