ASTM B817 Type II vs. R30035 Cobalt
ASTM B817 type II belongs to the titanium alloys classification, while R30035 cobalt belongs to the cobalt alloys. There are 25 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is ASTM B817 type II and the bottom bar is R30035 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 100 | |
| 220 to 230 |
| Elongation at Break, % | 3.0 to 13 | |
| 9.0 to 46 |
| Fatigue Strength, MPa | 390 to 530 | |
| 170 to 740 |
| Poisson's Ratio | 0.32 | |
| 0.29 |
| Reduction in Area, % | 4.0 to 13 | |
| 40 to 74 |
| Shear Modulus, GPa | 40 | |
| 84 to 89 |
| Tensile Strength: Ultimate (UTS), MPa | 900 to 960 | |
| 900 to 1900 |
| Tensile Strength: Yield (Proof), MPa | 780 to 900 | |
| 300 to 1650 |
Thermal Properties
| Latent Heat of Fusion, J/g | 400 | |
| 320 |
| Melting Completion (Liquidus), °C | 1580 | |
| 1440 |
| Melting Onset (Solidus), °C | 1530 | |
| 1320 |
| Specific Heat Capacity, J/kg-K | 550 | |
| 440 |
| Thermal Expansion, µm/m-K | 9.9 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 37 | |
| 100 |
| Density, g/cm3 | 4.6 | |
| 8.7 |
| Embodied Carbon, kg CO2/kg material | 40 | |
| 10 |
| Embodied Energy, MJ/kg | 650 | |
| 140 |
| Embodied Water, L/kg | 220 | |
| 410 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 26 to 120 | |
| 160 to 320 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2890 to 3890 | |
| 210 to 5920 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 to 15 |
| Stiffness to Weight: Bending, points | 34 | |
| 23 to 24 |
| Strength to Weight: Axial, points | 55 to 58 | |
| 29 to 61 |
| Strength to Weight: Bending, points | 45 to 47 | |
| 24 to 39 |
| Thermal Shock Resistance, points | 62 to 66 | |
| 23 to 46 |
Alloy Composition
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| Aluminum (Al), % | 5.0 to 6.0 | |
| 0 |
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 0 to 0.1 | |
| 0 to 0.025 |
| Chlorine (Cl), % | 0 to 0.2 | |
| 0 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 29.1 to 39 |
| Copper (Cu), % | 0.35 to 1.0 | |
| 0 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0.35 to 1.0 | |
| 0 to 1.0 |
| Manganese (Mn), % | 0 | |
| 0 to 0.15 |
| Molybdenum (Mo), % | 0 | |
| 9.0 to 10.5 |
| Nickel (Ni), % | 0 | |
| 33 to 37 |
| Nitrogen (N), % | 0 to 0.040 | |
| 0 |
| Oxygen (O), % | 0 to 0.3 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 0.1 | |
| 0 to 0.15 |
| Sodium (Na), % | 0 to 0.2 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.010 |
| Tin (Sn), % | 1.5 to 2.5 | |
| 0 |
| Titanium (Ti), % | 82.1 to 87.8 | |
| 0 to 1.0 |
| Vanadium (V), % | 5.0 to 6.0 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |