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EN-MC21320 Magnesium vs. S21904 Stainless Steel

EN-MC21320 magnesium belongs to the magnesium alloys classification, while S21904 stainless steel belongs to the iron alloys. There are 31 material properties with values for both materials. Properties with values for just one material (2, 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 S21904 stainless steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 68
210 to 300
Elastic (Young's, Tensile) Modulus, GPa 45
200
Elongation at Break, % 7.5
17 to 51
Fatigue Strength, MPa 95
380 to 550
Poisson's Ratio 0.29
0.28
Shear Modulus, GPa 18
78
Shear Strength, MPa 130
510 to 620
Tensile Strength: Ultimate (UTS), MPa 230
700 to 1000
Tensile Strength: Yield (Proof), MPa 140
390 to 910

Thermal Properties

Latent Heat of Fusion, J/g 370
290
Maximum Temperature: Mechanical, °C 110
980
Melting Completion (Liquidus), °C 600
1400
Melting Onset (Solidus), °C 530
1350
Specific Heat Capacity, J/kg-K 1000
480
Thermal Conductivity, W/m-K 66
14
Thermal Expansion, µm/m-K 26
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
2.5
Electrical Conductivity: Equal Weight (Specific), % IACS 91
2.9

Otherwise Unclassified Properties

Base Metal Price, % relative 12
15
Density, g/cm3 1.6
7.7
Embodied Carbon, kg CO2/kg material 23
3.0
Embodied Energy, MJ/kg 160
43
Embodied Water, L/kg 980
160

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15
160 to 310
Resilience: Unit (Modulus of Resilience), kJ/m3 200
380 to 2070
Stiffness to Weight: Axial, points 15
14
Stiffness to Weight: Bending, points 72
25
Strength to Weight: Axial, points 38
25 to 36
Strength to Weight: Bending, points 50
23 to 29
Thermal Diffusivity, mm2/s 40
3.8
Thermal Shock Resistance, points 13
15 to 21

Alloy Composition


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Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
0 to 0.040
Chromium (Cr), % 0
19 to 21.5
Copper (Cu), % 0 to 0.010
0
Iron (Fe), % 0 to 0.0050
59.5 to 67.4
Magnesium (Mg), % 92.5 to 95.9
0
Manganese (Mn), % 0.1 to 0.7
8.0 to 10
Nickel (Ni), % 0 to 0.0020
5.5 to 7.5
Nitrogen (N), % 0
0.15 to 0.4
Phosphorus (P), % 0
0 to 0.045
Silicon (Si), % 0.5 to 1.5
0 to 1.0
Sulfur (S), % 0
0 to 0.030
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.010
0