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EN-MC21110 Magnesium vs. S31277 Stainless Steel

EN-MC21110 magnesium belongs to the magnesium alloys classification, while S31277 stainless steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (7, 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 EN-MC21110 magnesium and the bottom bar is S31277 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 46
210
Elongation at Break, % 2.8 to 6.7
45
Fatigue Strength, MPa 75 to 78
380
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
80
Shear Strength, MPa 120 to 160
600
Tensile Strength: Ultimate (UTS), MPa 200 to 270
860
Tensile Strength: Yield (Proof), MPa 100 to 120
410

Thermal Properties

Latent Heat of Fusion, J/g 350
310
Maximum Temperature: Mechanical, °C 130
1100
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 500
1410
Specific Heat Capacity, J/kg-K 990
460
Thermal Expansion, µm/m-K 26
16

Otherwise Unclassified Properties

Base Metal Price, % relative 12
36
Density, g/cm3 1.7
8.1
Embodied Carbon, kg CO2/kg material 23
6.7
Embodied Energy, MJ/kg 160
90
Embodied Water, L/kg 990
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 4.9 to 14
320
Resilience: Unit (Modulus of Resilience), kJ/m3 120 to 150
410
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 69
24
Strength to Weight: Axial, points 33 to 44
29
Strength to Weight: Bending, points 45 to 54
25
Thermal Shock Resistance, points 12 to 16
19

Alloy Composition

Aluminum (Al), % 7.0 to 8.7
0
Carbon (C), % 0
0 to 0.020
Chromium (Cr), % 0
20.5 to 23
Copper (Cu), % 0 to 0.030
0.5 to 1.5
Iron (Fe), % 0 to 0.0050
35.5 to 46.2
Magnesium (Mg), % 89.6 to 92.6
0
Manganese (Mn), % 0.1 to 0.35
0 to 3.0
Molybdenum (Mo), % 0
6.5 to 8.0
Nickel (Ni), % 0 to 0.0020
26 to 28
Nitrogen (N), % 0
0.3 to 0.4
Phosphorus (P), % 0
0 to 0.030
Silicon (Si), % 0 to 0.2
0 to 0.5
Sulfur (S), % 0
0 to 0.010
Zinc (Zn), % 0.35 to 1.0
0
Residuals, % 0 to 0.010
0