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SAE-AISI 8645 Steel vs. 240.0 Aluminum

SAE-AISI 8645 steel belongs to the iron alloys classification, while 240.0 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 240.0 aluminum.

Metric UnitsUS Customary Units

Mechanical Properties

Elastic (Young's, Tensile) Modulus, GPa 190
72
Elongation at Break, % 12 to 23
1.0
Fatigue Strength, MPa 280 to 350
140
Poisson's Ratio 0.29
0.33
Shear Modulus, GPa 73
27
Tensile Strength: Ultimate (UTS), MPa 600 to 670
240
Tensile Strength: Yield (Proof), MPa 390 to 560
200

Thermal Properties

Latent Heat of Fusion, J/g 250
380
Maximum Temperature: Mechanical, °C 410
180
Melting Completion (Liquidus), °C 1460
600
Melting Onset (Solidus), °C 1420
520
Specific Heat Capacity, J/kg-K 470
860
Thermal Conductivity, W/m-K 39
96
Thermal Expansion, µm/m-K 13
22

Electrical Properties

Electrical Conductivity: Equal Volume, % IACS 7.3
23
Electrical Conductivity: Equal Weight (Specific), % IACS 8.4
65

Otherwise Unclassified Properties

Base Metal Price, % relative 2.6
12
Density, g/cm3 7.8
3.2
Embodied Carbon, kg CO2/kg material 1.5
8.7
Embodied Energy, MJ/kg 20
150
Embodied Water, L/kg 50
1100

Common Calculations

Resilience: Ultimate (Unit Rupture Work), MJ/m3 77 to 120
2.2
Resilience: Unit (Modulus of Resilience), kJ/m3 420 to 840
280
Stiffness to Weight: Axial, points 13
12
Stiffness to Weight: Bending, points 24
43
Strength to Weight: Axial, points 21 to 24
20
Strength to Weight: Bending, points 20 to 22
26
Thermal Diffusivity, mm2/s 10
35
Thermal Shock Resistance, points 18 to 20
11

Alloy Composition

Aluminum (Al), % 0
81.7 to 86.9
Carbon (C), % 0.43 to 0.48
0
Chromium (Cr), % 0.4 to 0.6
0
Copper (Cu), % 0
7.0 to 9.0
Iron (Fe), % 96.5 to 97.7
0 to 0.5
Magnesium (Mg), % 0
5.5 to 6.5
Manganese (Mn), % 0.75 to 1.0
0.3 to 0.7
Molybdenum (Mo), % 0.15 to 0.25
0
Nickel (Ni), % 0.4 to 0.7
0.3 to 0.7
Phosphorus (P), % 0 to 0.035
0
Silicon (Si), % 0.15 to 0.35
0 to 0.5
Sulfur (S), % 0 to 0.040
0
Titanium (Ti), % 0
0 to 0.2
Zinc (Zn), % 0
0 to 0.1
Residuals, % 0
0 to 0.15