ASTM B817 Type I vs. R30816 Cobalt
ASTM B817 type I belongs to the titanium alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (5, 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 I and the bottom bar is R30816 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 100 | |
| 210 |
| Elongation at Break, % | 4.0 to 13 | |
| 23 |
| Fatigue Strength, MPa | 360 to 520 | |
| 250 |
| Poisson's Ratio | 0.32 | |
| 0.3 |
| Reduction in Area, % | 5.0 to 29 | |
| 22 |
| Shear Modulus, GPa | 40 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 770 to 960 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 700 to 860 | |
| 460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 410 | |
| 300 |
| Melting Completion (Liquidus), °C | 1600 | |
| 1540 |
| Melting Onset (Solidus), °C | 1550 | |
| 1460 |
| Specific Heat Capacity, J/kg-K | 560 | |
| 420 |
| Thermal Conductivity, W/m-K | 7.1 | |
| 13 |
| Thermal Expansion, µm/m-K | 9.6 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 4.4 | |
| 9.1 |
| Embodied Carbon, kg CO2/kg material | 38 | |
| 20 |
| Embodied Energy, MJ/kg | 610 | |
| 320 |
| Embodied Water, L/kg | 200 | |
| 440 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 30 to 120 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 2310 to 3540 | |
| 510 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 35 | |
| 22 |
| Strength to Weight: Axial, points | 48 to 60 | |
| 31 |
| Strength to Weight: Bending, points | 42 to 49 | |
| 25 |
| Thermal Diffusivity, mm2/s | 2.9 | |
| 3.3 |
| Thermal Shock Resistance, points | 54 to 68 | |
| 28 |
Alloy Composition
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| Aluminum (Al), % | 5.5 to 6.8 | |
| 0 |
| Carbon (C), % | 0 to 0.1 | |
| 0.32 to 0.42 |
| Chlorine (Cl), % | 0 to 0.2 | |
| 0 |
| Chromium (Cr), % | 0 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 40 to 49.8 |
| Hydrogen (H), % | 0 to 0.015 | |
| 0 |
| Iron (Fe), % | 0 to 0.4 | |
| 0 to 5.0 |
| Manganese (Mn), % | 0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 3.5 to 4.5 |
| Nickel (Ni), % | 0 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 3.5 to 4.5 |
| 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 1.0 |
| Sodium (Na), % | 0 to 0.2 | |
| 0 |
| Sulfur (S), % | 0 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 3.5 to 4.5 |
| Titanium (Ti), % | 87 to 91 | |
| 0 |
| Tungsten (W), % | 0 | |
| 3.5 to 4.5 |
| Vanadium (V), % | 3.5 to 4.5 | |
| 0 |
| Residuals, % | 0 to 0.4 | |
| 0 |