7178-O Aluminum vs. Annealed 250 Maraging Steel
7178-O aluminum belongs to the aluminum alloys classification, while annealed 250 maraging steel belongs to the iron alloys. There are 24 material properties with values for both materials. Properties with values for just one material (9, 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 7178-O aluminum and the bottom bar is annealed 250 maraging steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 71 | |
| 190 |
| Elongation at Break, % | 12 | |
| 17 |
| Poisson's Ratio | 0.32 | |
| 0.3 |
| Shear Modulus, GPa | 27 | |
| 75 |
| Shear Strength, MPa | 140 | |
| 600 |
| Tensile Strength: Ultimate (UTS), MPa | 240 | |
| 970 |
| Tensile Strength: Yield (Proof), MPa | 120 | |
| 660 |
Thermal Properties
| Latent Heat of Fusion, J/g | 370 | |
| 270 |
| Melting Completion (Liquidus), °C | 630 | |
| 1480 |
| Melting Onset (Solidus), °C | 480 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 860 | |
| 450 |
| Thermal Expansion, µm/m-K | 23 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 10 | |
| 32 |
| Density, g/cm3 | 3.1 | |
| 8.2 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 4.9 |
| Embodied Energy, MJ/kg | 150 | |
| 65 |
| Embodied Water, L/kg | 1110 | |
| 140 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 24 | |
| 150 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 110 | |
| 1120 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 45 | |
| 23 |
| Strength to Weight: Axial, points | 21 | |
| 33 |
| Strength to Weight: Bending, points | 28 | |
| 26 |
| Thermal Shock Resistance, points | 10 | |
| 29 |
Alloy Composition
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| Aluminum (Al), % | 85.4 to 89.5 | |
| 0.050 to 0.15 |
| Boron (B), % | 0 | |
| 0 to 0.0030 |
| Calcium (Ca), % | 0 | |
| 0 to 0.050 |
| Carbon (C), % | 0 | |
| 0 to 0.030 |
| Chromium (Cr), % | 0.18 to 0.28 | |
| 0 |
| Cobalt (Co), % | 0 | |
| 7.0 to 8.5 |
| Copper (Cu), % | 1.6 to 2.4 | |
| 0 |
| Iron (Fe), % | 0 to 0.5 | |
| 66.3 to 71.1 |
| Magnesium (Mg), % | 2.4 to 3.1 | |
| 0 |
| Manganese (Mn), % | 0 to 0.3 | |
| 0 to 0.1 |
| Molybdenum (Mo), % | 0 | |
| 4.6 to 5.2 |
| Nickel (Ni), % | 0 | |
| 17 to 19 |
| Phosphorus (P), % | 0 | |
| 0 to 0.010 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 to 0.1 |
| Sulfur (S), % | 0 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 to 0.2 | |
| 0.3 to 0.5 |
| Zinc (Zn), % | 6.3 to 7.3 | |
| 0 |
| Zirconium (Zr), % | 0 | |
| 0 to 0.020 |
| Residuals, % | 0 to 0.15 | |
| 0 |