R30816 Cobalt vs. R05255 Alloy
R30816 cobalt belongs to the cobalt alloys classification, while R05255 alloy belongs to the otherwise unclassified metals. There are 20 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is R05255 alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 23 | |
| 20 |
| Poisson's Ratio | 0.3 | |
| 0.34 |
| Shear Modulus, GPa | 81 | |
| 70 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 540 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 450 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 140 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 140 |
| Thermal Conductivity, W/m-K | 13 | |
| 59 |
| Thermal Expansion, µm/m-K | 12 | |
| 6.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 17 |
| Embodied Water, L/kg | 440 | |
| 630 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 100 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 530 |
| Stiffness to Weight: Axial, points | 13 | |
| 6.3 |
| Stiffness to Weight: Bending, points | 22 | |
| 11 |
| Strength to Weight: Axial, points | 31 | |
| 9.1 |
| Strength to Weight: Bending, points | 25 | |
| 8.9 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 25 |
| Thermal Shock Resistance, points | 28 | |
| 31 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0 to 0.010 |
| Chromium (Cr), % | 19 to 21 | |
| 0 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.0015 |
| Iron (Fe), % | 0 to 5.0 | |
| 0 to 0.010 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 to 0.020 |
| Nickel (Ni), % | 19 to 21 | |
| 0 to 0.010 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 to 0.5 |
| Nitrogen (N), % | 0 | |
| 0 to 0.010 |
| Oxygen (O), % | 0 | |
| 0 to 0.015 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.0050 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 95.9 to 98 |
| Titanium (Ti), % | 0 | |
| 0 to 0.010 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 2.0 to 3.5 |