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AS41B Magnesium vs. SAE-AISI M43 Steel

AS41B magnesium belongs to the magnesium alloys classification, while SAE-AISI M43 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 AS41B magnesium and the bottom bar is SAE-AISI M43 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
77
Tensile Strength: Ultimate (UTS), MPa 210
810 to 2290

Thermal Properties

Latent Heat of Fusion, J/g 370
270
Melting Completion (Liquidus), °C 620
1550
Melting Onset (Solidus), °C 570
1500
Specific Heat Capacity, J/kg-K 1000
450
Thermal Conductivity, W/m-K 68
19
Thermal Expansion, µm/m-K 26
12

Otherwise Unclassified Properties

Base Metal Price, % relative 12
33
Density, g/cm3 1.7
8.2
Embodied Carbon, kg CO2/kg material 23
8.5
Embodied Energy, MJ/kg 160
120
Embodied Water, L/kg 980
140

Common Calculations

Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 72
24
Strength to Weight: Axial, points 35
27 to 77
Strength to Weight: Bending, points 47
24 to 47
Thermal Diffusivity, mm2/s 41
5.3
Thermal Shock Resistance, points 13
25 to 71

Alloy Composition

Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
1.2 to 1.3
Chromium (Cr), % 0
3.5 to 4.3
Cobalt (Co), % 0
7.8 to 8.8
Copper (Cu), % 0 to 0.020
0 to 0.25
Iron (Fe), % 0 to 0.0035
70.8 to 76
Magnesium (Mg), % 92.7 to 95.7
0
Manganese (Mn), % 0.35 to 0.7
0.2 to 0.4
Molybdenum (Mo), % 0
7.5 to 8.5
Nickel (Ni), % 0 to 0.0020
0 to 0.3
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0.5 to 1.5
0.15 to 0.65
Sulfur (S), % 0
0 to 0.030
Tungsten (W), % 0
2.3 to 3.0
Vanadium (V), % 0
1.5 to 1.8
Zinc (Zn), % 0 to 0.12
0