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ACI-ASTM CF20 Steel vs. AS41B Magnesium

ACI-ASTM CF20 steel belongs to the iron alloys classification, while AS41B 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 CF20 steel and the bottom bar is AS41B magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
45
Elongation at Break, % 50
6.0
Fatigue Strength, MPa 240
97
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Tensile Strength: Ultimate (UTS), MPa 530
210
Tensile Strength: Yield (Proof), MPa 250
140

Thermal Properties

Latent Heat of Fusion, J/g 300
370
Maximum Temperature: Mechanical, °C 970
110
Melting Completion (Liquidus), °C 1420
620
Melting Onset (Solidus), °C 1410
570
Specific Heat Capacity, J/kg-K 480
1000
Thermal Conductivity, W/m-K 16
68
Thermal Expansion, µm/m-K 17
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
17
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
92

Otherwise Unclassified Properties

Base Metal Price, % relative 16
12
Density, g/cm3 7.8
1.7
Embodied Carbon, kg CO2/kg material 3.1
23
Embodied Energy, MJ/kg 44
160
Embodied Water, L/kg 150
980

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
11
Resilience: Unit (Modulus of Resilience), kJ/m3 160
220
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
72
Strength to Weight: Axial, points 19
35
Strength to Weight: Bending, points 19
47
Thermal Diffusivity, mm2/s 4.3
41
Thermal Shock Resistance, points 11
13

Alloy Composition

Aluminum (Al), % 0
3.5 to 5.0
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 18 to 21
0
Copper (Cu), % 0
0 to 0.020
Iron (Fe), % 64.2 to 74
0 to 0.0035
Magnesium (Mg), % 0
92.7 to 95.7
Manganese (Mn), % 0 to 1.5
0.35 to 0.7
Nickel (Ni), % 8.0 to 11
0 to 0.0020
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0.5 to 1.5
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
0 to 0.12