SAE-AISI 8645 Steel vs. 8090 Aluminum
SAE-AISI 8645 steel belongs to the iron alloys classification, while 8090 aluminum belongs to the aluminum alloys. There are 29 material properties with values for both materials. Properties with values for just one material (3, 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 8090 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 67 |
| Elongation at Break, % | 12 to 23 | |
| 3.5 to 13 |
| Fatigue Strength, MPa | 280 to 350 | |
| 91 to 140 |
| Poisson's Ratio | 0.29 | |
| 0.33 |
| Shear Modulus, GPa | 73 | |
| 25 |
| Tensile Strength: Ultimate (UTS), MPa | 600 to 670 | |
| 340 to 490 |
| Tensile Strength: Yield (Proof), MPa | 390 to 560 | |
| 210 to 420 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 400 |
| Maximum Temperature: Mechanical, °C | 410 | |
| 190 |
| Melting Completion (Liquidus), °C | 1460 | |
| 660 |
| Melting Onset (Solidus), °C | 1420 | |
| 600 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 960 |
| Thermal Conductivity, W/m-K | 39 | |
| 95 to 160 |
| Thermal Expansion, µm/m-K | 13 | |
| 24 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 20 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 66 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.6 | |
| 18 |
| Density, g/cm3 | 7.8 | |
| 2.7 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 8.6 |
| Embodied Energy, MJ/kg | 20 | |
| 170 |
| Embodied Water, L/kg | 50 | |
| 1160 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 77 to 120 | |
| 16 to 41 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 420 to 840 | |
| 340 to 1330 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 50 |
| Strength to Weight: Axial, points | 21 to 24 | |
| 34 to 49 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 39 to 50 |
| Thermal Diffusivity, mm2/s | 10 | |
| 36 to 60 |
| Thermal Shock Resistance, points | 18 to 20 | |
| 15 to 22 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 93 to 98.4 |
| Carbon (C), % | 0.43 to 0.48 | |
| 0 |
| Chromium (Cr), % | 0.4 to 0.6 | |
| 0 to 0.1 |
| Copper (Cu), % | 0 | |
| 1.0 to 1.6 |
| Iron (Fe), % | 96.5 to 97.7 | |
| 0 to 0.3 |
| Lithium (Li), % | 0 | |
| 2.2 to 2.7 |
| Magnesium (Mg), % | 0 | |
| 0.6 to 1.3 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0 to 0.1 |
| 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 0.2 |
| Sulfur (S), % | 0 to 0.040 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 0 to 0.1 |
| Zinc (Zn), % | 0 | |
| 0 to 0.25 |
| Zirconium (Zr), % | 0 | |
| 0.040 to 0.16 |
| Residuals, % | 0 | |
| 0 to 0.15 |