R30075 Cobalt vs. Grade 21 Titanium
R30075 cobalt belongs to the cobalt alloys classification, while grade 21 titanium belongs to the titanium alloys. There are 26 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is R30075 cobalt and the bottom bar is grade 21 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 to 250 | |
| 140 |
| Elongation at Break, % | 12 | |
| 9.0 to 17 |
| Fatigue Strength, MPa | 250 to 840 | |
| 550 to 660 |
| Poisson's Ratio | 0.29 | |
| 0.32 |
| Reduction in Area, % | 20 | |
| 22 |
| Shear Modulus, GPa | 82 to 98 | |
| 51 |
| Tensile Strength: Ultimate (UTS), MPa | 780 to 1280 | |
| 890 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 480 to 840 | |
| 870 to 1170 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 410 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1740 |
| Melting Onset (Solidus), °C | 1290 | |
| 1690 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 500 |
| Thermal Conductivity, W/m-K | 13 | |
| 7.5 |
| Thermal Expansion, µm/m-K | 12 | |
| 7.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 5.4 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 32 |
| Embodied Energy, MJ/kg | 110 | |
| 490 |
| Embodied Water, L/kg | 530 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 140 | |
| 110 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 560 to 1410 | |
| 2760 to 5010 |
| Stiffness to Weight: Axial, points | 14 to 17 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 to 25 | |
| 32 |
| Strength to Weight: Axial, points | 26 to 42 | |
| 46 to 69 |
| Strength to Weight: Bending, points | 22 to 31 | |
| 38 to 50 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 2.8 |
| Thermal Shock Resistance, points | 21 to 29 | |
| 66 to 100 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.1 | |
| 2.5 to 3.5 |
| Boron (B), % | 0 to 0.010 | |
| 0 |
| Carbon (C), % | 0 to 0.35 | |
| 0 to 0.050 |
| Chromium (Cr), % | 27 to 30 | |
| 0 |
| Cobalt (Co), % | 58.7 to 68 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 0.4 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 14 to 16 |
| Nickel (Ni), % | 0 to 0.5 | |
| 0 |
| Niobium (Nb), % | 0 | |
| 2.2 to 3.2 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 | |
| 0 to 0.17 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0.15 to 0.25 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Titanium (Ti), % | 0 to 0.1 | |
| 76 to 81.2 |
| Tungsten (W), % | 0 to 0.2 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.4 |