R05255 Alloy vs. R30816 Cobalt
R05255 alloy belongs to the otherwise unclassified metals classification, while R30816 cobalt belongs to the cobalt alloys. 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 R05255 alloy and the bottom bar is R30816 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 20 | |
| 23 |
| Poisson's Ratio | 0.34 | |
| 0.3 |
| Shear Modulus, GPa | 70 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 540 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 450 | |
| 460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 140 | |
| 300 |
| Specific Heat Capacity, J/kg-K | 140 | |
| 420 |
| Thermal Conductivity, W/m-K | 59 | |
| 13 |
| Thermal Expansion, µm/m-K | 6.6 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 17 | |
| 9.1 |
| Embodied Water, L/kg | 630 | |
| 440 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 100 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 530 | |
| 510 |
| Stiffness to Weight: Axial, points | 6.3 | |
| 13 |
| Stiffness to Weight: Bending, points | 11 | |
| 22 |
| Strength to Weight: Axial, points | 9.1 | |
| 31 |
| Strength to Weight: Bending, points | 8.9 | |
| 25 |
| Thermal Diffusivity, mm2/s | 25 | |
| 3.3 |
| Thermal Shock Resistance, points | 31 | |
| 28 |
Alloy Composition
| Carbon (C), % | 0 to 0.010 | |
| 0.32 to 0.42 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 40 to 49.8 |
| Hydrogen (H), % | 0 to 0.0015 | |
| 0 |
| Iron (Fe), % | 0 to 0.010 | |
| 0 to 5.0 |
| Manganese (Mn), % | 0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 to 0.020 | |
| 3.5 to 4.5 |
| Nickel (Ni), % | 0 to 0.010 | |
| 19 to 21 |
| Niobium (Nb), % | 0 to 0.5 | |
| 3.5 to 4.5 |
| Nitrogen (N), % | 0 to 0.010 | |
| 0 |
| Oxygen (O), % | 0 to 0.015 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.0050 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 95.9 to 98 | |
| 3.5 to 4.5 |
| Titanium (Ti), % | 0 to 0.010 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.5 | |
| 3.5 to 4.5 |