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ISO-WD32260 Magnesium vs. SAE-AISI 5140 Steel

ISO-WD32260 magnesium belongs to the magnesium alloys classification, while SAE-AISI 5140 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, 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-WD32260 magnesium and the bottom bar is SAE-AISI 5140 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
190
Elongation at Break, % 4.5 to 6.0
12 to 29
Fatigue Strength, MPa 150 to 190
220 to 570
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 190 to 200
360 to 600
Tensile Strength: Ultimate (UTS), MPa 330 to 340
560 to 970
Tensile Strength: Yield (Proof), MPa 230 to 250
290 to 840

Thermal Properties

Latent Heat of Fusion, J/g 330
250
Maximum Temperature: Mechanical, °C 120
420
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 520
1420
Specific Heat Capacity, J/kg-K 970
470
Thermal Conductivity, W/m-K 110
45
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 28
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 140
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 13
2.1
Density, g/cm3 1.9
7.8
Embodied Carbon, kg CO2/kg material 23
1.4
Embodied Energy, MJ/kg 160
19
Embodied Water, L/kg 940
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 14 to 19
76 to 180
Resilience: Unit (Modulus of Resilience), kJ/m3 560 to 700
220 to 1880
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 63
24
Strength to Weight: Axial, points 48 to 51
20 to 34
Strength to Weight: Bending, points 56 to 58
19 to 28
Thermal Diffusivity, mm2/s 63
12
Thermal Shock Resistance, points 19 to 20
16 to 29

Alloy Composition


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Carbon (C), % 0
0.38 to 0.43
Chromium (Cr), % 0
0.7 to 0.9
Iron (Fe), % 0
97.3 to 98.1
Magnesium (Mg), % 92.7 to 94.8
0
Manganese (Mn), % 0
0.7 to 0.9
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 4.8 to 6.2
0
Zirconium (Zr), % 0.45 to 0.8
0
Residuals, % 0 to 0.3
0