G-CoCr28 Cobalt vs. ACI-ASTM CK20 Steel
G-CoCr28 cobalt belongs to the cobalt alloys classification, while ACI-ASTM CK20 steel belongs to the iron alloys. They have 46% of their average alloy composition in common. There are 27 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 G-CoCr28 cobalt and the bottom bar is ACI-ASTM CK20 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 6.7 | |
| 37 |
| Fatigue Strength, MPa | 130 | |
| 220 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 83 | |
| 78 |
| Tensile Strength: Ultimate (UTS), MPa | 560 | |
| 530 |
| Tensile Strength: Yield (Proof), MPa | 260 | |
| 260 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 310 |
| Maximum Temperature: Mechanical, °C | 1200 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1330 | |
| 1400 |
| Melting Onset (Solidus), °C | 1270 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 8.5 | |
| 14 |
| Thermal Expansion, µm/m-K | 14 | |
| 15 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 100 | |
| 25 |
| Density, g/cm3 | 8.1 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 6.2 | |
| 4.4 |
| Embodied Energy, MJ/kg | 84 | |
| 62 |
| Embodied Water, L/kg | 440 | |
| 190 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 31 | |
| 160 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 160 | |
| 170 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 19 | |
| 19 |
| Strength to Weight: Bending, points | 19 | |
| 19 |
| Thermal Diffusivity, mm2/s | 2.2 | |
| 3.7 |
| Thermal Shock Resistance, points | 14 | |
| 13 |
Alloy Composition
| Carbon (C), % | 0.050 to 0.25 | |
| 0 to 0.2 |
| Chromium (Cr), % | 27 to 30 | |
| 23 to 27 |
| Cobalt (Co), % | 48 to 52 | |
| 0 |
| Iron (Fe), % | 9.7 to 24.5 | |
| 46.7 to 58 |
| Manganese (Mn), % | 0 to 1.5 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 0 to 0.5 |
| Nickel (Ni), % | 0 to 4.0 | |
| 19 to 22 |
| Niobium (Nb), % | 0 to 0.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0.5 to 1.5 | |
| 0 to 2.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.040 |