R30155 Cobalt vs. Grade 31 Titanium
R30155 cobalt belongs to the iron alloys classification, while grade 31 titanium belongs to the titanium alloys. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is grade 31 titanium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 110 |
| Elongation at Break, % | 34 | |
| 20 |
| Fatigue Strength, MPa | 310 | |
| 300 |
| Poisson's Ratio | 0.29 | |
| 0.32 |
| Reduction in Area, % | 34 | |
| 34 |
| Shear Modulus, GPa | 81 | |
| 41 |
| Shear Strength, MPa | 570 | |
| 320 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 510 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 450 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 420 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 320 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1660 |
| Melting Onset (Solidus), °C | 1420 | |
| 1610 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 540 |
| Thermal Conductivity, W/m-K | 12 | |
| 21 |
| Thermal Expansion, µm/m-K | 14 | |
| 8.7 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.5 | |
| 4.5 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 36 |
| Embodied Energy, MJ/kg | 150 | |
| 600 |
| Embodied Water, L/kg | 300 | |
| 230 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 99 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 940 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 35 |
| Strength to Weight: Axial, points | 28 | |
| 32 |
| Strength to Weight: Bending, points | 24 | |
| 32 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 8.5 |
| Thermal Shock Resistance, points | 21 | |
| 39 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0 to 0.080 |
| Chromium (Cr), % | 20 to 22.5 | |
| 0 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0.2 to 0.8 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 0 to 0.3 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 0 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0 to 0.050 |
| Oxygen (O), % | 0 | |
| 0 to 0.35 |
| Palladium (Pd), % | 0 | |
| 0.040 to 0.080 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 97.9 to 99.76 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |
| Residuals, % | 0 | |
| 0 to 0.4 |