R30605 Cobalt vs. Grade 21 Titanium
R30605 cobalt belongs to the cobalt alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 23 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 R30605 cobalt and the bottom bar is grade 21 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 140 |
| Elongation at Break, % | 34 | |
| 9.0 to 17 |
| Fatigue Strength, MPa | 260 to 590 | |
| 550 to 660 |
| Poisson's Ratio | 0.29 | |
| 0.32 |
| Shear Modulus, GPa | 81 | |
| 51 |
| Tensile Strength: Ultimate (UTS), MPa | 1130 to 1900 | |
| 890 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 470 to 1600 | |
| 870 to 1170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 410 |
| Melting Completion (Liquidus), °C | 1410 | |
| 1740 |
| Melting Onset (Solidus), °C | 1330 | |
| 1690 |
| Specific Heat Capacity, J/kg-K | 410 | |
| 500 |
| Thermal Conductivity, W/m-K | 9.6 | |
| 7.5 |
| Thermal Expansion, µm/m-K | 12 | |
| 7.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.6 | |
| 5.4 |
| Embodied Carbon, kg CO2/kg material | 9.8 | |
| 32 |
| Embodied Energy, MJ/kg | 140 | |
| 490 |
| Embodied Water, L/kg | 450 | |
| 180 |
Common Calculations
| Stiffness to Weight: Axial, points | 12 | |
| 14 |
| Stiffness to Weight: Bending, points | 21 | |
| 32 |
| Strength to Weight: Axial, points | 33 to 55 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 25 to 36 | |
| 38 to 50 |
| Thermal Diffusivity, mm2/s | 2.5 | |
| 2.8 |
| Thermal Shock Resistance, points | 31 to 52 | |
| 66 to 100 |
Alloy Composition
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| Aluminum (Al), % | 0 | |
| 2.5 to 3.5 |
| Carbon (C), % | 0.050 to 0.15 | |
| 0 to 0.050 |
| Chromium (Cr), % | 19 to 21 | |
| 0 |
| Cobalt (Co), % | 46.4 to 57 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 0 to 3.0 | |
| 0 to 0.4 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 0 | |
| 14 to 16 |
| Nickel (Ni), % | 9.0 to 11 | |
| 0 |
| Niobium (Nb), % | 0 | |
| 2.2 to 3.2 |
| Nitrogen (N), % | 0 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 | |
| 0 to 0.17 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0 to 0.4 | |
| 0.15 to 0.25 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 76 to 81.2 |
| Tungsten (W), % | 14 to 16 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.4 |