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SAE-AISI 8645 Steel vs. 2011A Aluminum

SAE-AISI 8645 steel belongs to the iron alloys classification, while 2011A 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 8645 steel and the bottom bar is 2011A aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
70
Elongation at Break, % 12 to 23
6.8 to 16
Fatigue Strength, MPa 280 to 350
75 to 100
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
26
Shear Strength, MPa 380 to 400
190 to 250
Tensile Strength: Ultimate (UTS), MPa 600 to 670
310 to 410
Tensile Strength: Yield (Proof), MPa 390 to 560
140 to 310

Thermal Properties

Latent Heat of Fusion, J/g 250
390
Maximum Temperature: Mechanical, °C 410
190
Melting Completion (Liquidus), °C 1460
660
Melting Onset (Solidus), °C 1420
550
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 39
130
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
33
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
96

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
11
Density, g/cm3 7.8
3.1
Embodied Carbon, kg CO2/kg material 1.5
7.9
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
20 to 40
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
140 to 670
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
44
Strength to Weight: Axial, points 21 to 24
28 to 37
Strength to Weight: Bending, points 20 to 22
33 to 40
Thermal Diffusivity, mm2/s 10
49
Thermal Shock Resistance, points 18 to 20
14 to 18

Alloy Composition

Aluminum (Al), % 0
91.5 to 95.1
Bismuth (Bi), % 0
0.2 to 0.6
Carbon (C), % 0.43 to 0.48
0
Chromium (Cr), % 0.4 to 0.6
0
Copper (Cu), % 0
4.5 to 6.0
Iron (Fe), % 96.5 to 97.7
0 to 0.5
Lead (Pb), % 0
0.2 to 0.6
Manganese (Mn), % 0.75 to 1.0
0
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
Zinc (Zn), % 0
0 to 0.3
Residuals, % 0
0 to 0.15