R31539 Cobalt vs. ASTM B817 Type I
R31539 cobalt belongs to the cobalt alloys classification, while ASTM B817 type I belongs to the titanium alloys. There are 28 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is R31539 cobalt and the bottom bar is ASTM B817 type I.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 100 |
| Elongation at Break, % | 13 to 22 | |
| 4.0 to 13 |
| Fatigue Strength, MPa | 310 to 480 | |
| 360 to 520 |
| Poisson's Ratio | 0.29 | |
| 0.32 |
| Reduction in Area, % | 13 to 23 | |
| 5.0 to 29 |
| Shear Modulus, GPa | 86 | |
| 40 |
| Tensile Strength: Ultimate (UTS), MPa | 1000 to 1340 | |
| 770 to 960 |
| Tensile Strength: Yield (Proof), MPa | 590 to 940 | |
| 700 to 860 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 410 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1600 |
| Melting Onset (Solidus), °C | 1290 | |
| 1550 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 560 |
| Thermal Conductivity, W/m-K | 13 | |
| 7.1 |
| Thermal Expansion, µm/m-K | 13 | |
| 9.6 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 1.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 2.0 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 4.4 |
| Embodied Carbon, kg CO2/kg material | 8.2 | |
| 38 |
| Embodied Energy, MJ/kg | 110 | |
| 610 |
| Embodied Water, L/kg | 530 | |
| 200 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 190 | |
| 30 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 780 to 2000 | |
| 2310 to 3540 |
| Stiffness to Weight: Axial, points | 15 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 35 |
| Strength to Weight: Axial, points | 33 to 44 | |
| 48 to 60 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 42 to 49 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 2.9 |
| Thermal Shock Resistance, points | 24 to 32 | |
| 54 to 68 |
Alloy Composition
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| Aluminum (Al), % | 0.3 to 1.0 | |
| 5.5 to 6.8 |
| Carbon (C), % | 0 to 0.14 | |
| 0 to 0.1 |
| Chlorine (Cl), % | 0 | |
| 0 to 0.2 |
| Chromium (Cr), % | 26 to 30 | |
| 0 |
| Cobalt (Co), % | 57.7 to 68.7 | |
| 0 |
| Hydrogen (H), % | 0 | |
| 0 to 0.015 |
| Iron (Fe), % | 0 to 0.75 | |
| 0 to 0.4 |
| Lanthanum (La), % | 0.030 to 0.2 | |
| 0 |
| 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 0.040 |
| Oxygen (O), % | 0 | |
| 0 to 0.3 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.1 |
| Sodium (Na), % | 0 | |
| 0 to 0.2 |
| Titanium (Ti), % | 0 | |
| 87 to 91 |
| Vanadium (V), % | 0 | |
| 3.5 to 4.5 |
| Residuals, % | 0 | |
| 0 to 0.4 |