R31538 Cobalt vs. Grade 9 Titanium
R31538 cobalt belongs to the cobalt alloys classification, while grade 9 titanium belongs to the titanium alloys. There are 28 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 R31538 cobalt and the bottom bar is grade 9 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 110 |
| Elongation at Break, % | 13 to 23 | |
| 11 to 17 |
| Fatigue Strength, MPa | 310 to 480 | |
| 330 to 480 |
| Poisson's Ratio | 0.29 | |
| 0.32 |
| Reduction in Area, % | 13 to 22 | |
| 28 |
| Shear Modulus, GPa | 86 | |
| 40 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 700 to 960 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 540 to 830 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 410 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1640 |
| Melting Onset (Solidus), °C | 1290 | |
| 1590 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 550 |
| Thermal Conductivity, W/m-K | 13 | |
| 8.1 |
| Thermal Expansion, µm/m-K | 13 | |
| 9.1 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 1.4 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 2.7 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 4.5 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 36 |
| Embodied Energy, MJ/kg | 110 | |
| 580 |
| Embodied Water, L/kg | 530 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 89 to 110 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 1380 to 3220 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 35 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 43 to 60 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 39 to 48 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 3.3 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 52 to 71 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 2.5 to 3.5 |
| Carbon (C), % | 0.15 to 0.35 | |
| 0 to 0.080 |
| Chromium (Cr), % | 26 to 30 | |
| 0 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 0.25 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 0 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 to 0.030 |
| Oxygen (O), % | 0 | |
| 0 to 0.15 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 92.6 to 95.5 |
| Vanadium (V), % | 0 | |
| 2.0 to 3.0 |
| Residuals, % | 0 | |
| 0 to 0.4 |