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ISO-WD43150 Magnesium vs. S31727 Stainless Steel

ISO-WD43150 magnesium belongs to the magnesium alloys classification, while S31727 stainless steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (9, 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-WD43150 magnesium and the bottom bar is S31727 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 2.8
40
Fatigue Strength, MPa 100
240
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
78
Shear Strength, MPa 140
430
Tensile Strength: Ultimate (UTS), MPa 250
630
Tensile Strength: Yield (Proof), MPa 150
270

Thermal Properties

Latent Heat of Fusion, J/g 350
290
Maximum Temperature: Mechanical, °C 95
1010
Melting Completion (Liquidus), °C 610
1440
Melting Onset (Solidus), °C 590
1390
Specific Heat Capacity, J/kg-K 990
470
Thermal Expansion, µm/m-K 27
16

Otherwise Unclassified Properties

Base Metal Price, % relative 12
24
Density, g/cm3 1.7
8.0
Embodied Carbon, kg CO2/kg material 24
4.7
Embodied Energy, MJ/kg 160
64
Embodied Water, L/kg 970
180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 6.1
200
Resilience: Unit (Modulus of Resilience), kJ/m3 250
190
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 71
24
Strength to Weight: Axial, points 41
22
Strength to Weight: Bending, points 52
20
Thermal Shock Resistance, points 14
14

Alloy Composition

Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
17.5 to 19
Copper (Cu), % 0 to 0.050
2.8 to 4.0
Iron (Fe), % 0
53.7 to 61.3
Magnesium (Mg), % 97.5 to 98.8
0
Manganese (Mn), % 1.2 to 2.0
0 to 1.0
Molybdenum (Mo), % 0
3.8 to 4.5
Nickel (Ni), % 0 to 0.010
14.5 to 16.5
Nitrogen (N), % 0
0.15 to 0.21
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.1
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Residuals, % 0 to 0.3
0