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SAE-AISI 8645 Steel vs. A380.0 Aluminum

SAE-AISI 8645 steel belongs to the iron alloys classification, while A380.0 aluminum belongs to the aluminum 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 SAE-AISI 8645 steel and the bottom bar is A380.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Brinell Hardness 180 to 200
80
Elastic (Young's, Tensile) Modulus, GPa 190
73
Elongation at Break, % 12 to 23
3.3
Fatigue Strength, MPa 280 to 350
140
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Shear Strength, MPa 380 to 400
190
Tensile Strength: Ultimate (UTS), MPa 600 to 670
290
Tensile Strength: Yield (Proof), MPa 390 to 560
160

Thermal Properties

Latent Heat of Fusion, J/g 250
510
Maximum Temperature: Mechanical, °C 410
170
Melting Completion (Liquidus), °C 1460
590
Melting Onset (Solidus), °C 1420
550
Specific Heat Capacity, J/kg-K 470
870
Thermal Conductivity, W/m-K 39
96
Thermal Expansion, µm/m-K 13
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
25
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
78

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
11
Density, g/cm3 7.8
2.9
Embodied Carbon, kg CO2/kg material 1.5
7.5
Embodied Energy, MJ/kg 20
140
Embodied Water, L/kg 50
1040

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
8.3
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
180
Stiffness to Weight: Axial, points 13
14
Stiffness to Weight: Bending, points 24
48
Strength to Weight: Axial, points 21 to 24
28
Strength to Weight: Bending, points 20 to 22
34
Thermal Diffusivity, mm2/s 10
38
Thermal Shock Resistance, points 18 to 20
13

Alloy Composition

Aluminum (Al), % 0
80.3 to 89.5
Carbon (C), % 0.43 to 0.48
0
Chromium (Cr), % 0.4 to 0.6
0
Copper (Cu), % 0
3.0 to 4.0
Iron (Fe), % 96.5 to 97.7
0 to 1.3
Magnesium (Mg), % 0
0 to 0.1
Manganese (Mn), % 0.75 to 1.0
0 to 0.5
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0 to 0.5
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
7.5 to 9.5
Sulfur (S), % 0 to 0.040
0
Tin (Sn), % 0
0 to 0.35
Zinc (Zn), % 0
0 to 3.0
Residuals, % 0
0 to 0.5