ASTM B817 Type II vs. R30605 Cobalt
ASTM B817 type II belongs to the titanium alloys classification, while R30605 cobalt belongs to the cobalt alloys. There are 21 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown. Please note that the two materials have significantly dissimilar densities. This means that additional care is required when interpreting the data, because some material properties are based on units of mass, while others are based on units of area or volume.
For each property being compared, the top bar is ASTM B817 type II and the bottom bar is R30605 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 100 | |
| 210 |
| Elongation at Break, % | 3.0 to 13 | |
| 34 |
| Fatigue Strength, MPa | 390 to 530 | |
| 260 to 590 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Shear Modulus, GPa | 40 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 900 to 960 | |
| 1130 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 780 to 900 | |
| 470 to 1600 |
Thermal Properties
| Latent Heat of Fusion, J/g | 400 | |
| 290 |
| Melting Completion (Liquidus), °C | 1580 | |
| 1410 |
| Melting Onset (Solidus), °C | 1530 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 550 | |
| 410 |
| Thermal Expansion, µm/m-K | 9.9 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.6 | |
| 9.6 |
| Embodied Carbon, kg CO2/kg material | 40 | |
| 9.8 |
| Embodied Energy, MJ/kg | 650 | |
| 140 |
| Embodied Water, L/kg | 220 | |
| 450 |
Common Calculations
| Stiffness to Weight: Axial, points | 13 | |
| 12 |
| Stiffness to Weight: Bending, points | 34 | |
| 21 |
| Strength to Weight: Axial, points | 55 to 58 | |
| 33 to 55 |
| Strength to Weight: Bending, points | 45 to 47 | |
| 25 to 36 |
| Thermal Shock Resistance, points | 62 to 66 | |
| 31 to 52 |
Alloy Composition
| Aluminum (Al), % | 5.0 to 6.0 | |
| 0 |
| Carbon (C), % | 0 to 0.1 | |
| 0.050 to 0.15 |
| Chlorine (Cl), % | 0 to 0.2 | |
| 0 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 46.4 to 57 |
| 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 |
| Manganese (Mn), % | 0 | |
| 1.0 to 2.0 |
| Nickel (Ni), % | 0 | |
| 9.0 to 11 |
| Nitrogen (N), % | 0 to 0.040 | |
| 0 |
| Oxygen (O), % | 0 to 0.3 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.1 | |
| 0 to 0.4 |
| Sodium (Na), % | 0 to 0.2 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Tin (Sn), % | 1.5 to 2.5 | |
| 0 |
| Titanium (Ti), % | 82.1 to 87.8 | |
| 0 |
| Tungsten (W), % | 0 | |
| 14 to 16 |
| Vanadium (V), % | 5.0 to 6.0 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |