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SAE-AISI 8640 Steel vs. 5449 Aluminum

SAE-AISI 8640 steel belongs to the iron alloys classification, while 5449 aluminum belongs to the aluminum alloys. There are 30 material properties with values for both materials. Properties with values for just one material (1, 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 SAE-AISI 8640 steel and the bottom bar is 5449 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
69
Elongation at Break, % 23
4.0 to 17
Fatigue Strength, MPa 270
78 to 120
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Shear Strength, MPa 360
130 to 190
Tensile Strength: Ultimate (UTS), MPa 570
210 to 330
Tensile Strength: Yield (Proof), MPa 380
91 to 260

Thermal Properties

Latent Heat of Fusion, J/g 250
400
Maximum Temperature: Mechanical, °C 410
190
Melting Completion (Liquidus), °C 1460
650
Melting Onset (Solidus), °C 1420
590
Specific Heat Capacity, J/kg-K 470
900
Thermal Conductivity, W/m-K 39
140
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
35
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
110

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
9.5
Density, g/cm3 7.8
2.8
Embodied Carbon, kg CO2/kg material 1.5
8.5
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1180

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
12 to 29
Resilience: Unit (Modulus of Resilience), kJ/m3 380
60 to 480
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
50
Strength to Weight: Axial, points 20
22 to 33
Strength to Weight: Bending, points 20
29 to 39
Thermal Diffusivity, mm2/s 10
56
Thermal Shock Resistance, points 17
9.4 to 15

Alloy Composition

Aluminum (Al), % 0
94.1 to 97.8
Carbon (C), % 0.38 to 0.43
0
Chromium (Cr), % 0.4 to 0.6
0 to 0.3
Copper (Cu), % 0
0 to 0.3
Iron (Fe), % 96.6 to 97.8
0 to 0.7
Magnesium (Mg), % 0
1.6 to 2.6
Manganese (Mn), % 0.75 to 1.0
0.6 to 1.1
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 0.4
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.1
Zinc (Zn), % 0
0 to 0.3
Residuals, % 0
0 to 0.15