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SAE-AISI 8640 Steel vs. 7108A Aluminum

SAE-AISI 8640 steel belongs to the iron alloys classification, while 7108A 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 7108A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
69
Elongation at Break, % 23
11 to 13
Fatigue Strength, MPa 270
120 to 130
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Shear Strength, MPa 360
210
Tensile Strength: Ultimate (UTS), MPa 570
350
Tensile Strength: Yield (Proof), MPa 380
290 to 300

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 410
210
Melting Completion (Liquidus), °C 1460
630
Melting Onset (Solidus), °C 1420
520
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 39
150
Thermal Expansion, µm/m-K 13
24

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
36
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
110

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
10
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 1.5
8.3
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 120
38 to 44
Resilience: Unit (Modulus of Resilience), kJ/m3 380
610 to 640
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
47
Strength to Weight: Axial, points 20
33 to 34
Strength to Weight: Bending, points 20
38
Thermal Diffusivity, mm2/s 10
59
Thermal Shock Resistance, points 17
15 to 16

Alloy Composition

Aluminum (Al), % 0
91.6 to 94.4
Carbon (C), % 0.38 to 0.43
0
Chromium (Cr), % 0.4 to 0.6
0 to 0.040
Copper (Cu), % 0
0 to 0.050
Gallium (Ga), % 0
0 to 0.030
Iron (Fe), % 96.6 to 97.8
0 to 0.3
Magnesium (Mg), % 0
0.7 to 1.5
Manganese (Mn), % 0.75 to 1.0
0 to 0.050
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 0.2
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.030
Zinc (Zn), % 0
4.8 to 5.8
Zirconium (Zr), % 0
0.15 to 0.25
Residuals, % 0
0 to 0.15