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EN-MC21320 Magnesium vs. SAE-AISI 51B60 Steel

EN-MC21320 magnesium belongs to the magnesium alloys classification, while SAE-AISI 51B60 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 51B60 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 68
200
Elastic (Young's, Tensile) Modulus, GPa 45
190
Elongation at Break, % 7.5
12 to 21
Fatigue Strength, MPa 95
280 to 340
Poisson's Ratio 0.29
0.29
Shear Modulus, GPa 18
73
Shear Strength, MPa 130
390 to 420
Tensile Strength: Ultimate (UTS), MPa 230
660
Tensile Strength: Yield (Proof), MPa 140
400 to 550

Thermal Properties

Latent Heat of Fusion, J/g 370
250
Maximum Temperature: Mechanical, °C 110
420
Melting Completion (Liquidus), °C 600
1450
Melting Onset (Solidus), °C 530
1410
Specific Heat Capacity, J/kg-K 1000
470
Thermal Conductivity, W/m-K 66
43
Thermal Expansion, µm/m-K 26
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 17
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 91
8.3

Otherwise Unclassified Properties

Base Metal Price, % relative 12
2.1
Density, g/cm3 1.6
7.8
Embodied Carbon, kg CO2/kg material 23
1.4
Embodied Energy, MJ/kg 160
19
Embodied Water, L/kg 980
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 15
73 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 200
420 to 800
Stiffness to Weight: Axial, points 15
13
Stiffness to Weight: Bending, points 72
24
Strength to Weight: Axial, points 38
23
Strength to Weight: Bending, points 50
22
Thermal Diffusivity, mm2/s 40
12
Thermal Shock Resistance, points 13
19

Alloy Composition


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Aluminum (Al), % 3.5 to 5.0
0
Boron (B), % 0
0.00050 to 0.0030
Carbon (C), % 0
0.56 to 0.64
Chromium (Cr), % 0
0.7 to 0.9
Copper (Cu), % 0 to 0.010
0
Iron (Fe), % 0 to 0.0050
97 to 97.8
Magnesium (Mg), % 92.5 to 95.9
0
Manganese (Mn), % 0.1 to 0.7
0.75 to 1.0
Nickel (Ni), % 0 to 0.0020
0
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