Grade 705C Zirconium vs. R30605 Cobalt
Grade 705C zirconium belongs to the otherwise unclassified metals classification, while R30605 cobalt belongs to the cobalt alloys. There are 18 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is grade 705C zirconium and the bottom bar is R30605 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 98 | |
| 210 |
| Elongation at Break, % | 13 | |
| 34 |
| Poisson's Ratio | 0.34 | |
| 0.29 |
| Shear Modulus, GPa | 36 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 540 | |
| 1130 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 470 to 1600 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 290 |
| Specific Heat Capacity, J/kg-K | 270 | |
| 410 |
| Thermal Conductivity, W/m-K | 18 | |
| 9.6 |
| Thermal Expansion, µm/m-K | 5.7 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 6.7 | |
| 9.6 |
| Embodied Water, L/kg | 450 | |
| 450 |
Common Calculations
| Stiffness to Weight: Axial, points | 8.1 | |
| 12 |
| Stiffness to Weight: Bending, points | 23 | |
| 21 |
| Strength to Weight: Axial, points | 22 | |
| 33 to 55 |
| Strength to Weight: Bending, points | 22 | |
| 25 to 36 |
| Thermal Diffusivity, mm2/s | 9.9 | |
| 2.5 |
| Thermal Shock Resistance, points | 69 | |
| 31 to 52 |
Alloy Composition
| Carbon (C), % | 0 to 0.1 | |
| 0.050 to 0.15 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 46.4 to 57 |
| Hafnium (Hf), % | 0 to 4.5 | |
| 0 |
| Hydrogen (H), % | 0 to 0.0050 | |
| 0 |
| Iron (Fe), % | 0 to 0.3 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0 | |
| 1.0 to 2.0 |
| Nickel (Ni), % | 0 | |
| 9.0 to 11 |
| Niobium (Nb), % | 2.0 to 3.0 | |
| 0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 |
| Oxygen (O), % | 0 to 0.3 | |
| 0 |
| Phosphorus (P), % | 0 to 0.010 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 | |
| 0 to 0.4 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Tungsten (W), % | 0 | |
| 14 to 16 |
| Zirconium (Zr), % | 91.9 to 98 | |
| 0 |