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SAE-AISI 8645 Steel vs. A201.0 Aluminum

SAE-AISI 8645 steel belongs to the iron alloys classification, while A201.0 aluminum belongs to the aluminum alloys. There are 29 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 SAE-AISI 8645 steel and the bottom bar is A201.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
71
Elongation at Break, % 12 to 23
4.7
Fatigue Strength, MPa 280 to 350
97
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Tensile Strength: Ultimate (UTS), MPa 600 to 670
480
Tensile Strength: Yield (Proof), MPa 390 to 560
420

Thermal Properties

Latent Heat of Fusion, J/g 250
390
Maximum Temperature: Mechanical, °C 410
170
Melting Completion (Liquidus), °C 1460
650
Melting Onset (Solidus), °C 1420
570
Specific Heat Capacity, J/kg-K 470
880
Thermal Conductivity, W/m-K 39
120
Thermal Expansion, µm/m-K 13
23

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
30
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
90

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
11
Density, g/cm3 7.8
3.0
Embodied Carbon, kg CO2/kg material 1.5
8.1
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
22
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
1250
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
46
Strength to Weight: Axial, points 21 to 24
44
Strength to Weight: Bending, points 20 to 22
45
Thermal Diffusivity, mm2/s 10
46
Thermal Shock Resistance, points 18 to 20
21

Alloy Composition

Aluminum (Al), % 0
93.7 to 95.5
Carbon (C), % 0.43 to 0.48
0
Chromium (Cr), % 0.4 to 0.6
0
Copper (Cu), % 0
4.0 to 5.0
Iron (Fe), % 96.5 to 97.7
0 to 0.1
Magnesium (Mg), % 0
0.15 to 0.35
Manganese (Mn), % 0.75 to 1.0
0.2 to 0.4
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 0.050
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0.15 to 0.35
Residuals, % 0
0 to 0.1