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EN-MC21320 Magnesium vs. S21800 Stainless Steel

EN-MC21320 magnesium belongs to the magnesium alloys classification, while S21800 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (8, 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 S21800 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 68
210
Elastic (Young's, Tensile) Modulus, GPa 45
190
Elongation at Break, % 7.5
40
Fatigue Strength, MPa 95
330
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
75
Shear Strength, MPa 130
510
Tensile Strength: Ultimate (UTS), MPa 230
740
Tensile Strength: Yield (Proof), MPa 140
390

Thermal Properties

Latent Heat of Fusion, J/g 370
340
Maximum Temperature: Mechanical, °C 110
900
Melting Completion (Liquidus), °C 600
1360
Melting Onset (Solidus), °C 530
1310
Specific Heat Capacity, J/kg-K 1000
500
Thermal Expansion, µm/m-K 26
16

Otherwise Unclassified Properties

Base Metal Price, % relative 12
15
Density, g/cm3 1.6
7.5
Embodied Carbon, kg CO2/kg material 23
3.1
Embodied Energy, MJ/kg 160
45
Embodied Water, L/kg 980
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15
250
Resilience: Unit (Modulus of Resilience), kJ/m3 200
390
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 72
26
Strength to Weight: Axial, points 38
27
Strength to Weight: Bending, points 50
24
Thermal Shock Resistance, points 13
17

Alloy Composition


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Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
0 to 0.1
Chromium (Cr), % 0
16 to 18
Copper (Cu), % 0 to 0.010
0
Iron (Fe), % 0 to 0.0050
59.1 to 65.4
Magnesium (Mg), % 92.5 to 95.9
0
Manganese (Mn), % 0.1 to 0.7
7.0 to 9.0
Nickel (Ni), % 0 to 0.0020
8.0 to 9.0
Nitrogen (N), % 0
0.080 to 0.18
Phosphorus (P), % 0
0 to 0.060
Silicon (Si), % 0.5 to 1.5
3.5 to 4.5
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.010
0