G-CoCr28 Cobalt vs. EN 1.4945 Stainless Steel
G-CoCr28 cobalt belongs to the cobalt alloys classification, while EN 1.4945 stainless steel belongs to the iron alloys. They have a modest 37% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is EN 1.4945 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 6.7 | |
| 19 to 34 |
| Fatigue Strength, MPa | 130 | |
| 230 to 350 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 83 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 560 | |
| 640 to 740 |
| Tensile Strength: Yield (Proof), MPa | 260 | |
| 290 to 550 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 290 |
| Maximum Temperature: Mechanical, °C | 1200 | |
| 920 |
| Melting Completion (Liquidus), °C | 1330 | |
| 1490 |
| Melting Onset (Solidus), °C | 1270 | |
| 1440 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 470 |
| Thermal Conductivity, W/m-K | 8.5 | |
| 14 |
| Thermal Expansion, µm/m-K | 14 | |
| 17 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 100 | |
| 30 |
| Density, g/cm3 | 8.1 | |
| 8.1 |
| Embodied Carbon, kg CO2/kg material | 6.2 | |
| 5.0 |
| Embodied Energy, MJ/kg | 84 | |
| 73 |
| Embodied Water, L/kg | 440 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 31 | |
| 130 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 160 | |
| 210 to 760 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 19 | |
| 22 to 25 |
| Strength to Weight: Bending, points | 19 | |
| 20 to 22 |
| Thermal Diffusivity, mm2/s | 2.2 | |
| 3.7 |
| Thermal Shock Resistance, points | 14 | |
| 14 to 16 |
Alloy Composition
| Carbon (C), % | 0.050 to 0.25 | |
| 0.040 to 0.1 |
| Chromium (Cr), % | 27 to 30 | |
| 15.5 to 17.5 |
| Cobalt (Co), % | 48 to 52 | |
| 0 |
| Iron (Fe), % | 9.7 to 24.5 | |
| 57.9 to 65.7 |
| Manganese (Mn), % | 0 to 1.5 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 0 |
| Nickel (Ni), % | 0 to 4.0 | |
| 15.5 to 17.5 |
| Niobium (Nb), % | 0 to 0.5 | |
| 0.4 to 1.2 |
| Nitrogen (N), % | 0 | |
| 0.060 to 0.14 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.035 |
| Silicon (Si), % | 0.5 to 1.5 | |
| 0.3 to 0.6 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.015 |
| Tungsten (W), % | 0 | |
| 2.5 to 3.5 |