R30021 Cobalt vs. Low-oxygen Zirconium
R30021 cobalt belongs to the cobalt alloys classification, while low-oxygen zirconium belongs to the otherwise unclassified metals. There are 20 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is R30021 cobalt and the bottom bar is low-oxygen zirconium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 98 |
| Elongation at Break, % | 9.0 | |
| 23 |
| Poisson's Ratio | 0.29 | |
| 0.34 |
| Shear Modulus, GPa | 86 | |
| 37 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 330 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 270 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 250 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 270 |
| Thermal Conductivity, W/m-K | 15 | |
| 22 |
| Thermal Expansion, µm/m-K | 11 | |
| 5.7 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 6.7 |
| Embodied Water, L/kg | 520 | |
| 450 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 70 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 | |
| 370 |
| Stiffness to Weight: Axial, points | 15 | |
| 8.1 |
| Stiffness to Weight: Bending, points | 24 | |
| 23 |
| Strength to Weight: Axial, points | 23 | |
| 14 |
| Strength to Weight: Bending, points | 21 | |
| 16 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 12 |
| Thermal Shock Resistance, points | 21 | |
| 42 |
Alloy Composition
| Carbon (C), % | 0.2 to 0.35 | |
| 0 to 0.050 |
| Chromium (Cr), % | 26 to 29 | |
| 0 to 0.2 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 0 |
| Hafnium (Hf), % | 0 | |
| 0 to 4.5 |
| Hydrogen (H), % | 0 | |
| 0 to 0.0050 |
| Iron (Fe), % | 0 to 3.0 | |
| 0 to 0.2 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 0 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.025 |
| Oxygen (O), % | 0 | |
| 0 to 0.1 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 |
| Zirconium (Zr), % | 0 | |
| 94.7 to 100 |