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SAE-AISI A7 Steel vs. WE54A Magnesium

SAE-AISI A7 steel belongs to the iron alloys classification, while WE54A magnesium belongs to the magnesium alloys. There are 21 material properties with values for both materials. Properties with values for just one material (12, 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 A7 steel and the bottom bar is WE54A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
44
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 72
17
Tensile Strength: Ultimate (UTS), MPa 800 to 2150
270 to 300

Thermal Properties

Latent Heat of Fusion, J/g 260
330
Melting Completion (Liquidus), °C 1470
640
Melting Onset (Solidus), °C 1430
570
Specific Heat Capacity, J/kg-K 470
960
Thermal Conductivity, W/m-K 37
52
Thermal Expansion, µm/m-K 12
25

Otherwise Unclassified Properties

Base Metal Price, % relative 10
34
Density, g/cm3 7.7
1.9
Embodied Carbon, kg CO2/kg material 13
29
Embodied Energy, MJ/kg 200
260
Embodied Water, L/kg 100
900

Common Calculations

Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 25
62
Strength to Weight: Axial, points 29 to 77
39 to 43
Strength to Weight: Bending, points 25 to 48
49 to 51
Thermal Diffusivity, mm2/s 10
28
Thermal Shock Resistance, points 27 to 72
18 to 19

Alloy Composition

Carbon (C), % 2.0 to 2.9
0
Chromium (Cr), % 5.0 to 5.8
0
Copper (Cu), % 0 to 0.25
0 to 0.030
Iron (Fe), % 81.4 to 87.7
0 to 0.010
Lithium (Li), % 0
0 to 0.2
Magnesium (Mg), % 0
88.7 to 93.4
Manganese (Mn), % 0 to 0.8
0 to 0.030
Molybdenum (Mo), % 0.9 to 1.4
0
Nickel (Ni), % 0 to 0.3
0 to 0.0050
Phosphorus (P), % 0 to 0.030
0
Silicon (Si), % 0 to 0.5
0 to 0.010
Sulfur (S), % 0 to 0.030
0
Tungsten (W), % 0.5 to 1.5
0
Unspecified Rare Earths, % 0
1.5 to 4.0
Vanadium (V), % 3.9 to 5.2
0
Yttrium (Y), % 0
4.8 to 5.5
Zinc (Zn), % 0
0 to 0.2
Zirconium (Zr), % 0
0.4 to 1.0
Residuals, % 0
0 to 0.3