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ACI-ASTM CF20 Steel vs. AZ92A Magnesium

ACI-ASTM CF20 steel belongs to the iron alloys classification, while AZ92A magnesium belongs to the magnesium alloys. There are 29 material properties with values for both materials. Properties with values for just one material (5, 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 AZ92A magnesium.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
47
Elongation at Break, % 50
2.1 to 6.8
Fatigue Strength, MPa 240
76 to 90
Poisson's Ratio 0.28
0.29
Shear Modulus, GPa 77
18
Tensile Strength: Ultimate (UTS), MPa 530
170 to 270
Tensile Strength: Yield (Proof), MPa 250
83 to 140

Thermal Properties

Latent Heat of Fusion, J/g 300
350
Maximum Temperature: Mechanical, °C 970
130
Melting Completion (Liquidus), °C 1420
590
Melting Onset (Solidus), °C 1410
440
Specific Heat Capacity, J/kg-K 480
980
Thermal Conductivity, W/m-K 16
44 to 58
Thermal Expansion, µm/m-K 17
26

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
11 to 12
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
53 to 62

Otherwise Unclassified Properties

Base Metal Price, % relative 16
12
Density, g/cm3 7.8
1.8
Embodied Carbon, kg CO2/kg material 3.1
22
Embodied Energy, MJ/kg 44
160
Embodied Water, L/kg 150
980

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
4.0 to 14
Resilience: Unit (Modulus of Resilience), kJ/m3 160
73 to 220
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 25
67
Strength to Weight: Axial, points 19
26 to 41
Strength to Weight: Bending, points 19
38 to 51
Thermal Diffusivity, mm2/s 4.3
25 to 33
Thermal Shock Resistance, points 11
10 to 16

Alloy Composition

Aluminum (Al), % 0
8.3 to 9.7
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 18 to 21
0
Copper (Cu), % 0
0 to 0.25
Iron (Fe), % 64.2 to 74
0
Magnesium (Mg), % 0
86.7 to 90
Manganese (Mn), % 0 to 1.5
0.1 to 0.35
Nickel (Ni), % 8.0 to 11
0 to 0.010
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
0 to 0.3
Sulfur (S), % 0 to 0.040
0
Zinc (Zn), % 0
1.6 to 2.4
Residuals, % 0
0 to 0.3