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3102 Aluminum vs. ACI-ASTM CF20 Steel

3102 aluminum belongs to the aluminum alloys classification, while ACI-ASTM CF20 steel belongs to the iron 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 3102 aluminum and the bottom bar is ACI-ASTM CF20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 69
200
Elongation at Break, % 23 to 28
50
Fatigue Strength, MPa 31 to 34
240
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 26
77
Tensile Strength: Ultimate (UTS), MPa 92 to 100
530
Tensile Strength: Yield (Proof), MPa 28 to 34
250

Thermal Properties

Latent Heat of Fusion, J/g 400
300
Maximum Temperature: Mechanical, °C 180
970
Melting Completion (Liquidus), °C 640
1420
Melting Onset (Solidus), °C 640
1410
Specific Heat Capacity, J/kg-K 900
480
Thermal Conductivity, W/m-K 230
16
Thermal Expansion, µm/m-K 23
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 56
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 190
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 9.0
16
Density, g/cm3 2.7
7.8
Embodied Carbon, kg CO2/kg material 8.2
3.1
Embodied Energy, MJ/kg 150
44
Embodied Water, L/kg 1190
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 16 to 22
220
Resilience: Unit (Modulus of Resilience), kJ/m3 5.8 to 8.3
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 9.4 to 10
19
Strength to Weight: Bending, points 17 to 18
19
Thermal Diffusivity, mm2/s 92
4.3
Thermal Shock Resistance, points 4.1 to 4.4
11

Alloy Composition

Aluminum (Al), % 97.9 to 99.95
0
Carbon (C), % 0
0 to 0.2
Chromium (Cr), % 0
18 to 21
Copper (Cu), % 0 to 0.1
0
Iron (Fe), % 0 to 0.7
64.2 to 74
Manganese (Mn), % 0.050 to 0.4
0 to 1.5
Nickel (Ni), % 0
8.0 to 11
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 0 to 0.4
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.1
0
Zinc (Zn), % 0 to 0.3
0
Residuals, % 0 to 0.15
0