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2117 Aluminum vs. SAE-AISI 8115 Steel

2117 aluminum belongs to the aluminum alloys classification, while SAE-AISI 8115 steel belongs to the iron alloys. 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 2117 aluminum and the bottom bar is SAE-AISI 8115 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 70
180
Elastic (Young's, Tensile) Modulus, GPa 71
190
Elongation at Break, % 26
15
Fatigue Strength, MPa 95
320
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Shear Strength, MPa 200
370
Tensile Strength: Ultimate (UTS), MPa 300
610
Tensile Strength: Yield (Proof), MPa 170
500

Thermal Properties

Latent Heat of Fusion, J/g 400
250
Maximum Temperature: Mechanical, °C 220
410
Melting Completion (Liquidus), °C 650
1460
Melting Onset (Solidus), °C 550
1420
Specific Heat Capacity, J/kg-K 880
470
Thermal Conductivity, W/m-K 150
43
Thermal Expansion, µm/m-K 24
12

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 40
7.2
Electrical Conductivity: Equal Weight (Specific), % IACS 120
8.2

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.3
Density, g/cm3 3.0
7.8
Embodied Carbon, kg CO2/kg material 8.2
1.5
Embodied Energy, MJ/kg 150
19
Embodied Water, L/kg 1150
49

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 64
86
Resilience: Unit (Modulus of Resilience), kJ/m3 190
660
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 28
21
Strength to Weight: Bending, points 33
20
Thermal Diffusivity, mm2/s 59
12
Thermal Shock Resistance, points 12
19

Alloy Composition

Aluminum (Al), % 91 to 97.6
0
Carbon (C), % 0
0.13 to 0.18
Chromium (Cr), % 0 to 0.1
0.3 to 0.5
Copper (Cu), % 2.2 to 4.5
0
Iron (Fe), % 0 to 0.7
97.4 to 98.4
Magnesium (Mg), % 0.2 to 1.0
0
Manganese (Mn), % 0.4 to 1.0
0.7 to 0.9
Molybdenum (Mo), % 0
0.080 to 0.15
Nickel (Ni), % 0
0.2 to 0.4
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 0.2 to 0.8
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 0 to 0.25
0
Zirconium (Zr), % 0 to 0.25
0
Residuals, % 0 to 0.15
0