R30021 Cobalt vs. Z21210 Zinc
R30021 cobalt belongs to the cobalt alloys classification, while Z21210 zinc belongs to the zinc alloys. There are 12 material properties with values for both materials. Properties with values for just one material (18, in this case) are not shown.
For each property being compared, the top bar is R30021 cobalt and the bottom bar is Z21210 zinc.
Metric UnitsUS Customary Units
Mechanical Properties
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 150 to 170 |
Thermal Properties
| Melting Completion (Liquidus), °C | 1350 | |
| 420 |
| Melting Onset (Solidus), °C | 1190 | |
| 420 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 400 |
| Thermal Conductivity, W/m-K | 15 | |
| 110 |
| Thermal Expansion, µm/m-K | 11 | |
| 32 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.9 | |
| 28 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 35 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.1 |
Common Calculations
| Strength to Weight: Axial, points | 23 | |
| 5.7 to 6.4 |
| Strength to Weight: Bending, points | 21 | |
| 8.6 to 9.4 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 38 |