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EN-MC21320 Magnesium vs. S31266 Stainless Steel

EN-MC21320 magnesium belongs to the magnesium alloys classification, while S31266 stainless steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (4, 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-MC21320 magnesium and the bottom bar is S31266 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 45
210
Elongation at Break, % 7.5
40
Fatigue Strength, MPa 95
400
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
81
Shear Strength, MPa 130
590
Tensile Strength: Ultimate (UTS), MPa 230
860
Tensile Strength: Yield (Proof), MPa 140
470

Thermal Properties

Latent Heat of Fusion, J/g 370
310
Maximum Temperature: Mechanical, °C 110
1100
Melting Completion (Liquidus), °C 600
1470
Melting Onset (Solidus), °C 530
1420
Specific Heat Capacity, J/kg-K 1000
460
Thermal Conductivity, W/m-K 66
12
Thermal Expansion, µm/m-K 26
16

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
1.8
Electrical Conductivity: Equal Weight (Specific), % IACS 91
2.0

Otherwise Unclassified Properties

Base Metal Price, % relative 12
37
Density, g/cm3 1.6
8.2
Embodied Carbon, kg CO2/kg material 23
6.5
Embodied Energy, MJ/kg 160
89
Embodied Water, L/kg 980
220

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15
290
Resilience: Unit (Modulus of Resilience), kJ/m3 200
540
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 72
24
Strength to Weight: Axial, points 38
29
Strength to Weight: Bending, points 50
24
Thermal Diffusivity, mm2/s 40
3.1
Thermal Shock Resistance, points 13
18

Alloy Composition


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Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
0 to 0.030
Chromium (Cr), % 0
23 to 25
Copper (Cu), % 0 to 0.010
1.0 to 2.5
Iron (Fe), % 0 to 0.0050
34.1 to 46
Magnesium (Mg), % 92.5 to 95.9
0
Manganese (Mn), % 0.1 to 0.7
2.0 to 4.0
Molybdenum (Mo), % 0
5.2 to 6.2
Nickel (Ni), % 0 to 0.0020
21 to 24
Nitrogen (N), % 0
0.35 to 0.6
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0.5 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.020
Tungsten (W), % 0
1.5 to 2.5
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.010
0