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2024 Aluminum vs. SAE-AISI 4118 Steel

2024 aluminum belongs to the aluminum alloys classification, while SAE-AISI 4118 steel belongs to the iron alloys. There are 30 material properties with values for both materials. Properties with values for just one material (2, 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 2024 aluminum and the bottom bar is SAE-AISI 4118 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 4.0 to 16
23
Fatigue Strength, MPa 90 to 180
230
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Shear Strength, MPa 130 to 320
320
Tensile Strength: Ultimate (UTS), MPa 200 to 540
500
Tensile Strength: Yield (Proof), MPa 100 to 490
320

Thermal Properties

Latent Heat of Fusion, J/g 390
250
Maximum Temperature: Mechanical, °C 200
410
Melting Completion (Liquidus), °C 640
1460
Melting Onset (Solidus), °C 500
1420
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 120
46
Thermal Expansion, µm/m-K 23
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 30
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 90
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 11
2.3
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.3
1.5
Embodied Energy, MJ/kg 150
20
Embodied Water, L/kg 1140
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 20 to 68
100
Resilience: Unit (Modulus of Resilience), kJ/m3 70 to 1680
280
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 46
24
Strength to Weight: Axial, points 18 to 50
18
Strength to Weight: Bending, points 25 to 49
18
Thermal Diffusivity, mm2/s 46
13
Thermal Shock Resistance, points 8.6 to 24
15

Alloy Composition

Aluminum (Al), % 90.7 to 94.7
0
Carbon (C), % 0
0.18 to 0.23
Chromium (Cr), % 0 to 0.1
0.4 to 0.6
Copper (Cu), % 3.8 to 4.9
0
Iron (Fe), % 0 to 0.5
97.5 to 98.4
Magnesium (Mg), % 1.2 to 1.8
0
Manganese (Mn), % 0.3 to 0.9
0.7 to 0.9
Molybdenum (Mo), % 0
0.2 to 0.3
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0 to 0.5
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.15
0
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0 to 0.2
0
Residuals, % 0 to 0.15
0