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ACI-ASTM CN3MN Steel vs. EN-MC21120 Magnesium

ACI-ASTM CN3MN steel belongs to the iron alloys classification, while EN-MC21120 magnesium belongs to the magnesium alloys. There are 30 material properties with values for both materials. Properties with values for just one material (3, 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 ACI-ASTM CN3MN steel and the bottom bar is EN-MC21120 magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180
63 to 75
Elastic (Young's, Tensile) Modulus, GPa 210
46
Elongation at Break, % 39
2.2 to 6.7
Fatigue Strength, MPa 250
84 to 96
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 80
18
Tensile Strength: Ultimate (UTS), MPa 620
200 to 270
Tensile Strength: Yield (Proof), MPa 300
130 to 170

Thermal Properties

Latent Heat of Fusion, J/g 310
350
Maximum Temperature: Mechanical, °C 1100
130
Melting Completion (Liquidus), °C 1460
600
Melting Onset (Solidus), °C 1410
490
Specific Heat Capacity, J/kg-K 460
990
Thermal Conductivity, W/m-K 13
76
Thermal Expansion, µm/m-K 16
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 1.8
11
Electrical Conductivity: Equal Weight (Specific), % IACS 2.0
59

Otherwise Unclassified Properties

Base Metal Price, % relative 33
12
Density, g/cm3 8.1
1.7
Embodied Carbon, kg CO2/kg material 6.2
22
Embodied Energy, MJ/kg 84
160
Embodied Water, L/kg 200
990

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 200
5.0 to 15
Resilience: Unit (Modulus of Resilience), kJ/m3 210
180 to 320
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 24
69
Strength to Weight: Axial, points 21
31 to 43
Strength to Weight: Bending, points 20
43 to 53
Thermal Diffusivity, mm2/s 3.4
44
Thermal Shock Resistance, points 14
11 to 16

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 20 to 22
0
Copper (Cu), % 0 to 0.75
0 to 0.030
Iron (Fe), % 41.4 to 50.3
0 to 0.0050
Magnesium (Mg), % 0
88.6 to 91.3
Manganese (Mn), % 0 to 2.0
0.1 to 0.5
Molybdenum (Mo), % 6.0 to 7.0
0
Nickel (Ni), % 23.5 to 25.5
0 to 0.0020
Nitrogen (N), % 0.18 to 0.26
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.0
0 to 0.2
Sulfur (S), % 0 to 0.010
0
Zinc (Zn), % 0
0.35 to 1.0
Residuals, % 0
0 to 0.010