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EN-MC21210 Magnesium vs. SAE-AISI 4620 Steel

EN-MC21210 magnesium belongs to the magnesium alloys classification, while SAE-AISI 4620 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-MC21210 magnesium and the bottom bar is SAE-AISI 4620 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 48
150 to 210
Elastic (Young's, Tensile) Modulus, GPa 44
190
Elongation at Break, % 14
16 to 27
Fatigue Strength, MPa 70
260 to 360
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 17
73
Shear Strength, MPa 110
320 to 420
Tensile Strength: Ultimate (UTS), MPa 190
490 to 680
Tensile Strength: Yield (Proof), MPa 90
350 to 550

Thermal Properties

Latent Heat of Fusion, J/g 350
250
Maximum Temperature: Mechanical, °C 100
410
Melting Completion (Liquidus), °C 600
1460
Melting Onset (Solidus), °C 570
1420
Specific Heat Capacity, J/kg-K 1000
470
Thermal Conductivity, W/m-K 120
47
Thermal Expansion, µm/m-K 27
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 24
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 130
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 12
3.2
Density, g/cm3 1.6
7.9
Embodied Carbon, kg CO2/kg material 24
1.6
Embodied Energy, MJ/kg 160
22
Embodied Water, L/kg 980
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 22
100 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 92
330 to 800
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 72
24
Strength to Weight: Axial, points 32
17 to 24
Strength to Weight: Bending, points 44
18 to 22
Thermal Diffusivity, mm2/s 76
13
Thermal Shock Resistance, points 11
15 to 20

Alloy Composition


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Aluminum (Al), % 1.6 to 2.6
0
Carbon (C), % 0
0.17 to 0.22
Copper (Cu), % 0 to 0.010
0
Iron (Fe), % 0 to 0.0050
96.4 to 97.4
Magnesium (Mg), % 96.3 to 98.3
0
Manganese (Mn), % 0.1 to 0.7
0.45 to 0.65
Molybdenum (Mo), % 0
0.2 to 0.3
Nickel (Ni), % 0 to 0.0020
1.7 to 2.0
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.1
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