5251 Aluminum vs. EN 1.6771 Steel
5251 aluminum belongs to the aluminum alloys classification, while EN 1.6771 steel belongs to the iron alloys. There are 30 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 5251 aluminum and the bottom bar is EN 1.6771 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 44 to 79 | |
| 280 to 350 |
| Elastic (Young's, Tensile) Modulus, GPa | 68 | |
| 190 |
| Elongation at Break, % | 2.0 to 19 | |
| 8.0 to 8.7 |
| Fatigue Strength, MPa | 59 to 110 | |
| 440 to 680 |
| Poisson's Ratio | 0.33 | |
| 0.29 |
| Shear Modulus, GPa | 26 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 180 to 280 | |
| 930 to 1180 |
| Tensile Strength: Yield (Proof), MPa | 67 to 250 | |
| 740 to 1140 |
Thermal Properties
| Latent Heat of Fusion, J/g | 400 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 180 | |
| 440 |
| Melting Completion (Liquidus), °C | 650 | |
| 1460 |
| Melting Onset (Solidus), °C | 610 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 900 | |
| 470 |
| Thermal Conductivity, W/m-K | 150 | |
| 46 |
| Thermal Expansion, µm/m-K | 24 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 37 | |
| 8.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 120 | |
| 9.2 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 5.0 |
| Density, g/cm3 | 2.7 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 8.5 | |
| 1.9 |
| Embodied Energy, MJ/kg | 150 | |
| 25 |
| Embodied Water, L/kg | 1180 | |
| 58 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 5.4 to 27 | |
| 75 to 93 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 33 to 450 | |
| 1460 to 3450 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 50 | |
| 24 |
| Strength to Weight: Axial, points | 18 to 29 | |
| 33 to 41 |
| Strength to Weight: Bending, points | 26 to 35 | |
| 27 to 31 |
| Thermal Diffusivity, mm2/s | 61 | |
| 13 |
| Thermal Shock Resistance, points | 7.9 to 13 | |
| 27 to 35 |
Alloy Composition
| Aluminum (Al), % | 95.5 to 98.2 | |
| 0 |
| Carbon (C), % | 0 | |
| 0.27 to 0.33 |
| Chromium (Cr), % | 0 to 0.15 | |
| 0.8 to 1.2 |
| Copper (Cu), % | 0 to 0.15 | |
| 0 |
| Iron (Fe), % | 0 to 0.5 | |
| 92.2 to 95 |
| Magnesium (Mg), % | 1.7 to 2.4 | |
| 0 |
| Manganese (Mn), % | 0.1 to 0.5 | |
| 0.6 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 0.3 to 0.6 |
| Nickel (Ni), % | 0 | |
| 3.0 to 4.0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 to 0.6 |
| Sulfur (S), % | 0 | |
| 0 to 0.020 |
| Titanium (Ti), % | 0 to 0.15 | |
| 0 |
| Zinc (Zn), % | 0 to 0.15 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |