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ISO-WD32250 Magnesium vs. SAE-AISI A7 Steel

ISO-WD32250 magnesium belongs to the magnesium alloys classification, while SAE-AISI A7 steel belongs to the iron alloys. There are 21 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 ISO-WD32250 magnesium and the bottom bar is SAE-AISI A7 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
190
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
72
Tensile Strength: Ultimate (UTS), MPa 310 to 330
800 to 2150

Thermal Properties

Latent Heat of Fusion, J/g 340
260
Melting Completion (Liquidus), °C 600
1470
Melting Onset (Solidus), °C 550
1430
Specific Heat Capacity, J/kg-K 980
470
Thermal Conductivity, W/m-K 130
37
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Base Metal Price, % relative 13
10
Density, g/cm3 1.8
7.7
Embodied Carbon, kg CO2/kg material 24
13
Embodied Energy, MJ/kg 160
200
Embodied Water, L/kg 950
100

Common Calculations

Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 67
25
Strength to Weight: Axial, points 49 to 51
29 to 77
Strength to Weight: Bending, points 58 to 60
25 to 48
Thermal Diffusivity, mm2/s 72
10
Thermal Shock Resistance, points 19 to 20
27 to 72

Alloy Composition


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Carbon (C), % 0
2.0 to 2.9
Chromium (Cr), % 0
5.0 to 5.8
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 0
81.4 to 87.7
Magnesium (Mg), % 94.9 to 97.1
0
Manganese (Mn), % 0
0 to 0.8
Molybdenum (Mo), % 0
0.9 to 1.4
Nickel (Ni), % 0
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0
0 to 0.5
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
0.5 to 1.5
Vanadium (V), % 0
3.9 to 5.2
Zinc (Zn), % 2.5 to 4.0
0
Zirconium (Zr), % 0.45 to 0.8
0
Residuals, % 0 to 0.3
0