Grade 21 Titanium vs. R30035 Cobalt
Grade 21 titanium belongs to the titanium alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 27 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is grade 21 titanium and the bottom bar is R30035 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 140 | |
| 220 to 230 |
| Elongation at Break, % | 9.0 to 17 | |
| 9.0 to 46 |
| Fatigue Strength, MPa | 550 to 660 | |
| 170 to 740 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Reduction in Area, % | 22 | |
| 40 to 74 |
| Shear Modulus, GPa | 51 | |
| 84 to 89 |
| Tensile Strength: Ultimate (UTS), MPa | 890 to 1340 | |
| 900 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 870 to 1170 | |
| 300 to 1650 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 320 |
| Melting Completion (Liquidus), °C | 1740 | |
| 1440 |
| Melting Onset (Solidus), °C | 1690 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 500 | |
| 440 |
| Thermal Conductivity, W/m-K | 7.5 | |
| 11 |
| Thermal Expansion, µm/m-K | 7.1 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 60 | |
| 100 |
| Density, g/cm3 | 5.4 | |
| 8.7 |
| Embodied Carbon, kg CO2/kg material | 32 | |
| 10 |
| Embodied Energy, MJ/kg | 490 | |
| 140 |
| Embodied Water, L/kg | 180 | |
| 410 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 110 to 180 | |
| 160 to 320 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2760 to 5010 | |
| 210 to 5920 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 to 15 |
| Stiffness to Weight: Bending, points | 32 | |
| 23 to 24 |
| Strength to Weight: Axial, points | 46 to 69 | |
| 29 to 61 |
| Strength to Weight: Bending, points | 38 to 50 | |
| 24 to 39 |
| Thermal Diffusivity, mm2/s | 2.8 | |
| 3.0 |
| Thermal Shock Resistance, points | 66 to 100 | |
| 23 to 46 |
Alloy Composition
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| Aluminum (Al), % | 2.5 to 3.5 | |
| 0 |
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 0 to 0.050 | |
| 0 to 0.025 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 29.1 to 39 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 0 to 1.0 |
| Manganese (Mn), % | 0 | |
| 0 to 0.15 |
| Molybdenum (Mo), % | 14 to 16 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 0 | |
| 33 to 37 |
| Niobium (Nb), % | 2.2 to 3.2 | |
| 0 |
| Nitrogen (N), % | 0 to 0.030 | |
| 0 |
| Oxygen (O), % | 0 to 0.17 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0.15 to 0.25 | |
| 0 to 0.15 |
| Sulfur (S), % | 0 | |
| 0 to 0.010 |
| Titanium (Ti), % | 76 to 81.2 | |
| 0 to 1.0 |
| Residuals, % | 0 to 0.4 | |
| 0 |