R30021 Cobalt vs. ZA-27
R30021 cobalt belongs to the cobalt alloys classification, while ZA-27 belongs to the zinc alloys. There are 28 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is R30021 cobalt and the bottom bar is ZA-27.
Metric UnitsUS Customary Units
Mechanical Properties
| Compressive (Crushing) Strength, MPa | 1300 | |
| 260 to 370 |
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 78 |
| Elongation at Break, % | 9.0 | |
| 2.0 to 4.5 |
| Fatigue Strength, MPa | 250 | |
| 110 to 170 |
| Poisson's Ratio | 0.29 | |
| 0.27 |
| Shear Modulus, GPa | 86 | |
| 31 |
| Tensile Strength: Ultimate (UTS), MPa | 700 | |
| 400 to 430 |
| Tensile Strength: Yield (Proof), MPa | 500 | |
| 260 to 370 |
Thermal Properties
| Latent Heat of Fusion, J/g | 330 | |
| 130 |
| Melting Completion (Liquidus), °C | 1350 | |
| 480 |
| Melting Onset (Solidus), °C | 1190 | |
| 380 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 530 |
| Thermal Conductivity, W/m-K | 15 | |
| 130 |
| Thermal Expansion, µm/m-K | 11 | |
| 26 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 1.9 | |
| 30 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 53 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 5.0 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 4.2 |
| Embodied Energy, MJ/kg | 110 | |
| 80 |
| Embodied Water, L/kg | 520 | |
| 570 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 57 | |
| 8.1 to 18 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 570 | |
| 420 to 890 |
| Stiffness to Weight: Axial, points | 15 | |
| 8.6 |
| Stiffness to Weight: Bending, points | 24 | |
| 28 |
| Strength to Weight: Axial, points | 23 | |
| 22 to 24 |
| Strength to Weight: Bending, points | 21 | |
| 24 to 25 |
| Thermal Diffusivity, mm2/s | 3.8 | |
| 47 |
| Thermal Shock Resistance, points | 21 | |
| 14 to 15 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 25 to 28 |
| Cadmium (Cd), % | 0 | |
| 0 to 0.0060 |
| Carbon (C), % | 0.2 to 0.35 | |
| 0 |
| Chromium (Cr), % | 26 to 29 | |
| 0 |
| Cobalt (Co), % | 61.7 to 67.3 | |
| 0 |
| Copper (Cu), % | 0 | |
| 2.0 to 2.5 |
| Iron (Fe), % | 0 to 3.0 | |
| 0 to 0.1 |
| Lead (Pb), % | 0 | |
| 0 to 0.0060 |
| Magnesium (Mg), % | 0 | |
| 0.010 to 0.020 |
| Molybdenum (Mo), % | 4.5 to 6.0 | |
| 0 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 0 to 0.020 |
| Silicon (Si), % | 0 to 1.5 | |
| 0 to 0.080 |
| Tin (Sn), % | 0 | |
| 0 to 0.0030 |
| Zinc (Zn), % | 0 | |
| 69.3 to 73 |