R30021 Cobalt vs. Titanium 4-4-2
R30021 cobalt belongs to the cobalt alloys classification, while titanium 4-4-2 belongs to the titanium alloys. There are 25 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 R30021 cobalt and the bottom bar is titanium 4-4-2.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 110 |
| Elongation at Break, % | 9.0 | |
| 10 |
| Fatigue Strength, MPa | 250 | |
| 590 to 620 |
| Poisson's Ratio | 0.29 | |
| 0.32 |
| Shear Modulus, GPa | 86 | |
| 42 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 1150 to 1250 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 1030 to 1080 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 410 |
| Melting Completion (Liquidus), °C | 1350 | |
| 1610 |
| Melting Onset (Solidus), °C | 1190 | |
| 1560 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 540 |
| Thermal Conductivity, W/m-K | 15 | |
| 6.7 |
| Thermal Expansion, µm/m-K | 11 | |
| 8.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 4.7 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 30 |
| Embodied Energy, MJ/kg | 110 | |
| 480 |
| Embodied Water, L/kg | 520 | |
| 180 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 110 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 | |
| 4700 to 5160 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 34 |
| Strength to Weight: Axial, points | 23 | |
| 68 to 74 |
| Strength to Weight: Bending, points | 21 | |
| 52 to 55 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 2.6 |
| Thermal Shock Resistance, points | 21 | |
| 86 to 93 |
Alloy Composition
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| Aluminum (Al), % | 0 | |
| 3.0 to 5.0 |
| Carbon (C), % | 0.2 to 0.35 | |
| 0 to 0.080 |
| Chromium (Cr), % | 26 to 29 | |
| 0 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 0 to 3.0 | |
| 0 to 0.2 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 3.0 to 5.0 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.050 |
| Oxygen (O), % | 0 | |
| 0 to 0.25 |
| Silicon (Si), % | 0 to 1.5 | |
| 0.3 to 0.7 |
| Tin (Sn), % | 0 | |
| 1.5 to 2.5 |
| Titanium (Ti), % | 0 | |
| 85.8 to 92.2 |
| Residuals, % | 0 | |
| 0 to 0.4 |