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ACI-ASTM CF20 Steel vs. A384.0 Aluminum

ACI-ASTM CF20 steel belongs to the iron alloys classification, while A384.0 aluminum belongs to the aluminum 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 A384.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 200
74
Elongation at Break, % 50
2.5
Fatigue Strength, MPa 240
140
Poisson's Ratio 0.28
0.33
Shear Modulus, GPa 77
28
Tensile Strength: Ultimate (UTS), MPa 530
330
Tensile Strength: Yield (Proof), MPa 250
170

Thermal Properties

Latent Heat of Fusion, J/g 300
550
Maximum Temperature: Mechanical, °C 970
170
Melting Completion (Liquidus), °C 1420
610
Melting Onset (Solidus), °C 1410
510
Specific Heat Capacity, J/kg-K 480
880
Thermal Conductivity, W/m-K 16
96
Thermal Expansion, µm/m-K 17
21

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 2.0
23
Electrical Conductivity: Equal Weight (Specific), % IACS 2.3
73

Otherwise Unclassified Properties

Base Metal Price, % relative 16
11
Density, g/cm3 7.8
2.8
Embodied Carbon, kg CO2/kg material 3.1
7.5
Embodied Energy, MJ/kg 44
140
Embodied Water, L/kg 150
1010

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 220
6.9
Resilience: Unit (Modulus of Resilience), kJ/m3 160
180
Stiffness to Weight: Axial, points 14
15
Stiffness to Weight: Bending, points 25
50
Strength to Weight: Axial, points 19
32
Strength to Weight: Bending, points 19
38
Thermal Diffusivity, mm2/s 4.3
39
Thermal Shock Resistance, points 11
15

Alloy Composition

Aluminum (Al), % 0
79.3 to 86.5
Carbon (C), % 0 to 0.2
0
Chromium (Cr), % 18 to 21
0
Copper (Cu), % 0
3.0 to 4.5
Iron (Fe), % 64.2 to 74
0 to 1.3
Magnesium (Mg), % 0
0 to 0.1
Manganese (Mn), % 0 to 1.5
0 to 0.5
Nickel (Ni), % 8.0 to 11
0 to 0.5
Phosphorus (P), % 0 to 0.040
0
Silicon (Si), % 0 to 2.0
10.5 to 12
Sulfur (S), % 0 to 0.040
0
Tin (Sn), % 0
0 to 0.35
Zinc (Zn), % 0
0 to 1.0
Residuals, % 0
0 to 0.5