5251-O Aluminum vs. Annealed SAE-AISI H21
5251-O aluminum belongs to the aluminum alloys classification, while annealed SAE-AISI H21 belongs to the iron alloys. There are 22 material properties with values for both materials. Properties with values for just one material (11, 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-O aluminum and the bottom bar is annealed SAE-AISI H21.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 44 | |
| 220 |
| Elastic (Young's, Tensile) Modulus, GPa | 68 | |
| 200 |
| Poisson's Ratio | 0.33 | |
| 0.29 |
| Shear Modulus, GPa | 26 | |
| 76 |
| Tensile Strength: Ultimate (UTS), MPa | 180 | |
| 720 |
Thermal Properties
| Latent Heat of Fusion, J/g | 400 | |
| 250 |
| Melting Completion (Liquidus), °C | 650 | |
| 1630 |
| Melting Onset (Solidus), °C | 610 | |
| 1580 |
| Specific Heat Capacity, J/kg-K | 900 | |
| 440 |
| Thermal Conductivity, W/m-K | 150 | |
| 27 |
| Thermal Expansion, µm/m-K | 24 | |
| 11 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 9.5 | |
| 23 |
| Density, g/cm3 | 2.7 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 8.5 | |
| 4.5 |
| Embodied Energy, MJ/kg | 150 | |
| 68 |
| Embodied Water, L/kg | 1180 | |
| 72 |
Common Calculations
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 50 | |
| 23 |
| Strength to Weight: Axial, points | 18 | |
| 23 |
| Strength to Weight: Bending, points | 26 | |
| 21 |
| Thermal Diffusivity, mm2/s | 61 | |
| 7.1 |
| Thermal Shock Resistance, points | 7.9 | |
| 24 |
Alloy Composition
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| Aluminum (Al), % | 95.5 to 98.2 | |
| 0 |
| Carbon (C), % | 0 | |
| 0.28 to 0.36 |
| Chromium (Cr), % | 0 to 0.15 | |
| 3.0 to 3.8 |
| Copper (Cu), % | 0 to 0.15 | |
| 0 to 0.25 |
| Iron (Fe), % | 0 to 0.5 | |
| 87.6 to 93.8 |
| Magnesium (Mg), % | 1.7 to 2.4 | |
| 0 |
| Manganese (Mn), % | 0.1 to 0.5 | |
| 0.15 to 0.4 |
| Nickel (Ni), % | 0 | |
| 0 to 0.3 |
| Phosphorus (P), % | 0 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.4 | |
| 0.15 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Titanium (Ti), % | 0 to 0.15 | |
| 0 |
| Tungsten (W), % | 0 | |
| 8.5 to 10 |
| Vanadium (V), % | 0 | |
| 0.3 to 0.6 |
| Zinc (Zn), % | 0 to 0.15 | |
| 0 |
| Residuals, % | 0 to 0.15 | |
| 0 |