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4145 Aluminum vs. ACI-ASTM CF20 Steel

4145 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 (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 4145 aluminum and the bottom bar is ACI-ASTM CF20 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 73
200
Elongation at Break, % 2.2
50
Fatigue Strength, MPa 48
240
Poisson's Ratio 0.33
0.28
Shear Modulus, GPa 28
77
Tensile Strength: Ultimate (UTS), MPa 120
530
Tensile Strength: Yield (Proof), MPa 68
250

Thermal Properties

Latent Heat of Fusion, J/g 540
300
Maximum Temperature: Mechanical, °C 160
970
Melting Completion (Liquidus), °C 590
1420
Melting Onset (Solidus), °C 520
1410
Specific Heat Capacity, J/kg-K 880
480
Thermal Conductivity, W/m-K 100
16
Thermal Expansion, µm/m-K 21
17

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 26
2.0
Electrical Conductivity: Equal Weight (Specific), % IACS 84
2.3

Otherwise Unclassified Properties

Base Metal Price, % relative 10
16
Density, g/cm3 2.8
7.8
Embodied Carbon, kg CO2/kg material 7.6
3.1
Embodied Energy, MJ/kg 140
44
Embodied Water, L/kg 1040
150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 2.3
220
Resilience: Unit (Modulus of Resilience), kJ/m3 31
160
Stiffness to Weight: Axial, points 14
14
Stiffness to Weight: Bending, points 50
25
Strength to Weight: Axial, points 12
19
Strength to Weight: Bending, points 19
19
Thermal Diffusivity, mm2/s 42
4.3
Thermal Shock Resistance, points 5.5
11

Alloy Composition

Aluminum (Al), % 83 to 87.4
0
Carbon (C), % 0
0 to 0.2
Chromium (Cr), % 0 to 0.15
18 to 21
Copper (Cu), % 3.3 to 4.7
0
Iron (Fe), % 0 to 0.8
64.2 to 74
Magnesium (Mg), % 0 to 0.15
0
Manganese (Mn), % 0 to 0.15
0 to 1.5
Nickel (Ni), % 0
8.0 to 11
Phosphorus (P), % 0
0 to 0.040
Silicon (Si), % 9.3 to 10.7
0 to 2.0
Sulfur (S), % 0
0 to 0.040
Zinc (Zn), % 0 to 0.2
0
Residuals, % 0 to 0.15
0