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308.0 Aluminum vs. SAE-AISI 8645 Steel

308.0 aluminum belongs to the aluminum alloys classification, while SAE-AISI 8645 steel belongs to the iron alloys. There are 31 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 308.0 aluminum and the bottom bar is SAE-AISI 8645 steel.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 70
180 to 200
Elastic (Young's, Tensile) Modulus, GPa 73
190
Elongation at Break, % 2.0
12 to 23
Fatigue Strength, MPa 89
280 to 350
Poisson's Ratio 0.33
0.29
Shear Modulus, GPa 27
73
Shear Strength, MPa 150
380 to 400
Tensile Strength: Ultimate (UTS), MPa 190
600 to 670
Tensile Strength: Yield (Proof), MPa 110
390 to 560

Thermal Properties

Latent Heat of Fusion, J/g 470
250
Maximum Temperature: Mechanical, °C 170
410
Melting Completion (Liquidus), °C 620
1460
Melting Onset (Solidus), °C 540
1420
Specific Heat Capacity, J/kg-K 870
470
Thermal Conductivity, W/m-K 140
39
Thermal Expansion, µm/m-K 20
13

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 37
7.3
Electrical Conductivity: Equal Weight (Specific), % IACS 110
8.4

Otherwise Unclassified Properties

Base Metal Price, % relative 10
2.6
Density, g/cm3 2.9
7.8
Embodied Carbon, kg CO2/kg material 7.7
1.5
Embodied Energy, MJ/kg 140
20
Embodied Water, L/kg 1080
50

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 3.3
77 to 120
Resilience: Unit (Modulus of Resilience), kJ/m3 83
420 to 840
Stiffness to Weight: Axial, points 14
13
Stiffness to Weight: Bending, points 47
24
Strength to Weight: Axial, points 18
21 to 24
Strength to Weight: Bending, points 25
20 to 22
Thermal Diffusivity, mm2/s 55
10
Thermal Shock Resistance, points 9.2
18 to 20

Alloy Composition

Aluminum (Al), % 85.7 to 91
0
Carbon (C), % 0
0.43 to 0.48
Chromium (Cr), % 0
0.4 to 0.6
Copper (Cu), % 4.0 to 5.0
0
Iron (Fe), % 0 to 1.0
96.5 to 97.7
Magnesium (Mg), % 0 to 0.1
0
Manganese (Mn), % 0 to 0.5
0.75 to 1.0
Molybdenum (Mo), % 0
0.15 to 0.25
Nickel (Ni), % 0
0.4 to 0.7
Phosphorus (P), % 0
0 to 0.035
Silicon (Si), % 5.0 to 6.0
0.15 to 0.35
Sulfur (S), % 0
0 to 0.040
Titanium (Ti), % 0 to 0.25
0
Zinc (Zn), % 0 to 1.0
0
Residuals, % 0 to 0.5
0