ASTM B817 Type II vs. R30021 Cobalt
ASTM B817 type II belongs to the titanium alloys classification, while R30021 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is ASTM B817 type II and the bottom bar is R30021 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 100 | |
| 220 |
| Elongation at Break, % | 3.0 to 13 | |
| 9.0 |
| Fatigue Strength, MPa | 390 to 530 | |
| 250 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 40 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 900 to 960 | |
| 700 |
| Tensile Strength: Yield (Proof), MPa | 780 to 900 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 400 | |
| 330 |
| Melting Completion (Liquidus), °C | 1580 | |
| 1350 |
| Melting Onset (Solidus), °C | 1530 | |
| 1190 |
| Specific Heat Capacity, J/kg-K | 550 | |
| 450 |
| Thermal Expansion, µm/m-K | 9.9 | |
| 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.6 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 40 | |
| 8.0 |
| Embodied Energy, MJ/kg | 650 | |
| 110 |
| Embodied Water, L/kg | 220 | |
| 520 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 26 to 120 | |
| 57 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2890 to 3890 | |
| 570 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 34 | |
| 24 |
| Strength to Weight: Axial, points | 55 to 58 | |
| 23 |
| Strength to Weight: Bending, points | 45 to 47 | |
| 21 |
| Thermal Shock Resistance, points | 62 to 66 | |
| 21 |
Alloy Composition
| Aluminum (Al), % | 5.0 to 6.0 | |
| 0 |
| Carbon (C), % | 0 to 0.1 | |
| 0.2 to 0.35 |
| Chlorine (Cl), % | 0 to 0.2 | |
| 0 |
| Chromium (Cr), % | 0 | |
| 26 to 29 |
| Cobalt (Co), % | 0 | |
| 61.7 to 67.3 |
| Copper (Cu), % | 0.35 to 1.0 | |
| 0 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0.35 to 1.0 | |
| 0 to 3.0 |
| Molybdenum (Mo), % | 0 | |
| 4.5 to 6.0 |
| Nickel (Ni), % | 0 | |
| 2.0 to 3.0 |
| Nitrogen (N), % | 0 to 0.040 | |
| 0 |
| Oxygen (O), % | 0 to 0.3 | |
| 0 |
| Silicon (Si), % | 0 to 0.1 | |
| 0 to 1.5 |
| Sodium (Na), % | 0 to 0.2 | |
| 0 |
| Tin (Sn), % | 1.5 to 2.5 | |
| 0 |
| Titanium (Ti), % | 82.1 to 87.8 | |
| 0 |
| Vanadium (V), % | 5.0 to 6.0 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |