ASTM B522 Class II vs. R30012 Cobalt
ASTM B522 class II belongs to the otherwise unclassified metals classification, while R30012 cobalt belongs to the cobalt alloys. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is ASTM B522 class II and the bottom bar is R30012 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 96 | |
| 220 |
| Elongation at Break, % | 1.1 to 28 | |
| 1.0 |
| Poisson's Ratio | 0.41 | |
| 0.28 |
| Shear Modulus, GPa | 34 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 280 to 490 | |
| 830 |
| Tensile Strength: Yield (Proof), MPa | 120 to 210 | |
| 650 |
Thermal Properties
| Latent Heat of Fusion, J/g | 77 | |
| 320 |
| Melting Completion (Liquidus), °C | 1030 | |
| 1470 |
| Melting Onset (Solidus), °C | 1030 | |
| 1280 |
| Specific Heat Capacity, J/kg-K | 160 | |
| 440 |
| Thermal Expansion, µm/m-K | 15 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 11 | |
| 1.8 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 5.7 | |
| 1.8 |
Otherwise Unclassified Properties
| Density, g/cm3 | 17 | |
| 8.8 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 4.4 to 63 | |
| 7.7 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 75 to 230 | |
| 960 |
| Stiffness to Weight: Axial, points | 3.1 | |
| 14 |
| Stiffness to Weight: Bending, points | 8.9 | |
| 23 |
| Strength to Weight: Axial, points | 4.4 to 7.8 | |
| 26 |
| Strength to Weight: Bending, points | 5.5 to 8.0 | |
| 22 |
| Thermal Shock Resistance, points | 13 to 24 | |
| 23 |
Alloy Composition
| Carbon (C), % | 0 | |
| 1.4 to 2.0 |
| Chromium (Cr), % | 0 | |
| 27 to 32 |
| Cobalt (Co), % | 0 | |
| 47.5 to 64.1 |
| Gold (Au), % | 68.5 to 69.5 | |
| 0 |
| Iron (Fe), % | 0 | |
| 0 to 3.0 |
| Molybdenum (Mo), % | 0 | |
| 0 to 1.0 |
| Nickel (Ni), % | 0 | |
| 0 to 3.0 |
| Platinum (Pt), % | 5.5 to 6.5 | |
| 0 |
| Silicon (Si), % | 0 | |
| 0 to 2.0 |
| Silver (Ag), % | 24.5 to 25.5 | |
| 0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |
| Tungsten (W), % | 0 | |
| 7.5 to 9.5 |
| Residuals, % | 0 to 0.26 | |
| 0 |