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ACI-ASTM CF3MN Steel vs. AZ31C Magnesium

ACI-ASTM CF3MN steel belongs to the iron alloys classification, while AZ31C magnesium belongs to the magnesium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (4, 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 CF3MN steel and the bottom bar is AZ31C magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 39
12
Fatigue Strength, MPa 250
150
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 78
17
Tensile Strength: Ultimate (UTS), MPa 580
260
Tensile Strength: Yield (Proof), MPa 290
200

Thermal Properties

Latent Heat of Fusion, J/g 300
350
Maximum Temperature: Mechanical, °C 1010
110
Melting Completion (Liquidus), °C 1440
600
Melting Onset (Solidus), °C 1390
550
Specific Heat Capacity, J/kg-K 480
990
Thermal Conductivity, W/m-K 15
130
Thermal Expansion, µm/m-K 16
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.1
19
Electrical Conductivity: Equal Weight (Specific), % IACS 2.4
98

Otherwise Unclassified Properties

Base Metal Price, % relative 19
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 3.9
23
Embodied Energy, MJ/kg 53
160
Embodied Water, L/kg 160
970

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 190
28
Resilience: Unit (Modulus of Resilience), kJ/m3 210
440
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
70
Strength to Weight: Axial, points 20
42
Strength to Weight: Bending, points 20
53
Thermal Diffusivity, mm2/s 4.1
74
Thermal Shock Resistance, points 13
16

Alloy Composition

Aluminum (Al), % 0
2.4 to 3.6
Carbon (C), % 0 to 0.030
0
Chromium (Cr), % 17 to 22
0
Copper (Cu), % 0
0 to 0.1
Iron (Fe), % 58.7 to 71.9
0
Magnesium (Mg), % 0
93.4 to 97
Manganese (Mn), % 0 to 1.5
0.15 to 1.0
Molybdenum (Mo), % 2.0 to 3.0
0
Nickel (Ni), % 9.0 to 13
0 to 0.030
Nitrogen (N), % 0.1 to 0.2
0
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 1.5
0 to 0.1
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0.5 to 1.5
Residuals, % 0
0 to 0.3