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EN-MC21320 Magnesium vs. SAE-AISI 8620 Steel

EN-MC21320 magnesium belongs to the magnesium alloys classification, while SAE-AISI 8620 steel belongs to the iron alloys. 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 SAE-AISI 8620 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 68
150 to 210
Elastic (Young's, Tensile) Modulus, GPa 45
190
Elongation at Break, % 7.5
13 to 31
Fatigue Strength, MPa 95
270 to 360
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 130
340 to 420
Tensile Strength: Ultimate (UTS), MPa 230
520 to 690
Tensile Strength: Yield (Proof), MPa 140
360 to 570

Thermal Properties

Latent Heat of Fusion, J/g 370
250
Maximum Temperature: Mechanical, °C 110
410
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 530
1420
Specific Heat Capacity, J/kg-K 1000
470
Thermal Conductivity, W/m-K 66
39
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 91
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.6
Density, g/cm3 1.6
7.8
Embodied Carbon, kg CO2/kg material 23
1.5
Embodied Energy, MJ/kg 160
20
Embodied Water, L/kg 980
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15
86 to 150
Resilience: Unit (Modulus of Resilience), kJ/m3 200
340 to 880
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 72
24
Strength to Weight: Axial, points 38
18 to 24
Strength to Weight: Bending, points 50
18 to 22
Thermal Diffusivity, mm2/s 40
10
Thermal Shock Resistance, points 13
15 to 20

Alloy Composition


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Aluminum (Al), % 3.5 to 5.0
0
Carbon (C), % 0
0.18 to 0.23
Chromium (Cr), % 0
0.4 to 0.6
Copper (Cu), % 0 to 0.010
0
Iron (Fe), % 0 to 0.0050
96.9 to 98
Magnesium (Mg), % 92.5 to 95.9
0
Manganese (Mn), % 0.1 to 0.7
0.7 to 0.9
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0 to 0.0020
0.4 to 0.7
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0.5 to 1.5
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.010
0