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SAE-AISI 8645 Steel vs. 206.0 Aluminum

SAE-AISI 8645 steel belongs to the iron alloys classification, while 206.0 aluminum belongs to the aluminum alloys. There are 31 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 206.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
95 to 110
Elastic (Young's, Tensile) Modulus, GPa 190
71
Elongation at Break, % 12 to 23
8.4 to 12
Fatigue Strength, MPa 280 to 350
88 to 210
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Shear Strength, MPa 380 to 400
260
Tensile Strength: Ultimate (UTS), MPa 600 to 670
330 to 440
Tensile Strength: Yield (Proof), MPa 390 to 560
190 to 350

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
19

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
33
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
99

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
8.0
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1150

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
24 to 49
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
270 to 840
Stiffness to Weight: Axial, points 13
13
Stiffness to Weight: Bending, points 24
46
Strength to Weight: Axial, points 21 to 24
30 to 40
Strength to Weight: Bending, points 20 to 22
35 to 42
Thermal Diffusivity, mm2/s 10
46
Thermal Shock Resistance, points 18 to 20
17 to 23

Alloy Composition

Aluminum (Al), % 0
93.3 to 95.3
Carbon (C), % 0.43 to 0.48
0
Chromium (Cr), % 0.4 to 0.6
0
Copper (Cu), % 0
4.2 to 5.0
Iron (Fe), % 96.5 to 97.7
0 to 0.15
Magnesium (Mg), % 0
0.15 to 0.35
Manganese (Mn), % 0.75 to 1.0
0.2 to 0.5
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0 to 0.050
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 0.1
Sulfur (S), % 0 to 0.040
0
Tin (Sn), % 0
0 to 0.050
Titanium (Ti), % 0
0.15 to 0.3
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15