Nuclear Grade Hafnium vs. R30008 Cobalt
Nuclear grade hafnium belongs to the otherwise unclassified metals classification, while R30008 cobalt belongs to the cobalt alloys. There are 16 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is nuclear grade hafnium and the bottom bar is R30008 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 78 | |
| 210 |
| Elongation at Break, % | 25 | |
| 1.1 to 73 |
| Poisson's Ratio | 0.26 | |
| 0.29 |
| Shear Modulus, GPa | 31 | |
| 83 |
| Tensile Strength: Ultimate (UTS), MPa | 350 | |
| 950 to 1700 |
| Tensile Strength: Yield (Proof), MPa | 170 | |
| 500 to 1080 |
Thermal Properties
| Latent Heat of Fusion, J/g | 130 | |
| 320 |
| Specific Heat Capacity, J/kg-K | 140 | |
| 450 |
| Thermal Expansion, µm/m-K | 5.9 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 13 | |
| 8.4 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 180 | |
| 590 to 2720 |
| Stiffness to Weight: Axial, points | 3.3 | |
| 14 |
| Stiffness to Weight: Bending, points | 11 | |
| 24 |
| Strength to Weight: Axial, points | 7.4 | |
| 31 to 56 |
| Strength to Weight: Bending, points | 8.4 | |
| 25 to 37 |
| Thermal Shock Resistance, points | 55 | |
| 25 to 44 |
Alloy Composition
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| Boron (B), % | 0 | |
| 0 to 0.0010 |
| Carbon (C), % | 0 | |
| 0 to 0.15 |
| Chromium (Cr), % | 0 | |
| 18.5 to 21.5 |
| Cobalt (Co), % | 0 | |
| 39 to 42 |
| Hafnium (Hf), % | 99.8 to 100 | |
| 0 |
| Iron (Fe), % | 0 | |
| 7.6 to 20 |
| Manganese (Mn), % | 0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 6.5 to 7.5 |
| Nickel (Ni), % | 0 | |
| 15 to 18 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 | |
| 0 to 1.2 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |
| Residuals, % | 0 to 0.23 | |
| 0 |