SAE-AISI 4161 Steel vs. A206.0 Aluminum
SAE-AISI 4161 steel belongs to the iron alloys classification, while A206.0 aluminum belongs to the aluminum alloys. 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 4161 steel and the bottom bar is A206.0 aluminum.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 200 | |
| 100 to 110 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 70 |
| Elongation at Break, % | 20 | |
| 4.2 to 10 |
| Fatigue Strength, MPa | 290 | |
| 90 to 180 |
| Poisson's Ratio | 0.29 | |
| 0.33 |
| Shear Modulus, GPa | 73 | |
| 26 |
| Shear Strength, MPa | 420 | |
| 260 |
| Tensile Strength: Ultimate (UTS), MPa | 680 | |
| 390 to 440 |
| Tensile Strength: Yield (Proof), MPa | 410 | |
| 250 to 380 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 390 |
| Maximum Temperature: Mechanical, °C | 420 | |
| 170 |
| Melting Completion (Liquidus), °C | 1460 | |
| 670 |
| Melting Onset (Solidus), °C | 1410 | |
| 550 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 880 |
| Thermal Conductivity, W/m-K | 43 | |
| 130 |
| Thermal Expansion, µm/m-K | 12 | |
| 23 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.3 | |
| 30 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.4 | |
| 90 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 2.5 | |
| 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 | 120 | |
| 16 to 37 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 460 | |
| 440 to 1000 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 46 |
| Strength to Weight: Axial, points | 24 | |
| 36 to 41 |
| Strength to Weight: Bending, points | 22 | |
| 39 to 43 |
| Thermal Diffusivity, mm2/s | 12 | |
| 48 |
| Thermal Shock Resistance, points | 22 | |
| 17 to 19 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 93.9 to 95.7 |
| Carbon (C), % | 0.56 to 0.64 | |
| 0 |
| Chromium (Cr), % | 0.7 to 0.9 | |
| 0 |
| Copper (Cu), % | 0 | |
| 4.2 to 5.0 |
| Iron (Fe), % | 96.7 to 97.6 | |
| 0 to 0.1 |
| Magnesium (Mg), % | 0 | |
| 0 to 0.15 |
| Manganese (Mn), % | 0.75 to 1.0 | |
| 0 to 0.2 |
| Molybdenum (Mo), % | 0.25 to 0.35 | |
| 0 |
| Nickel (Ni), % | 0 | |
| 0 to 0.050 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 |
| Silicon (Si), % | 0.15 to 0.35 | |
| 0 to 0.050 |
| 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 |