G-CoCr28 Cobalt vs. S45000 Stainless Steel
G-CoCr28 cobalt belongs to the cobalt alloys classification, while S45000 stainless steel belongs to the iron alloys. They have a modest 35% 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 (8, in this case) are not shown.
For each property being compared, the top bar is G-CoCr28 cobalt and the bottom bar is S45000 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 6.7 | |
| 6.8 to 14 |
| Fatigue Strength, MPa | 130 | |
| 330 to 650 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 83 | |
| 76 |
| Tensile Strength: Ultimate (UTS), MPa | 560 | |
| 980 to 1410 |
| Tensile Strength: Yield (Proof), MPa | 260 | |
| 580 to 1310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 280 |
| Maximum Temperature: Mechanical, °C | 1200 | |
| 840 |
| Melting Completion (Liquidus), °C | 1330 | |
| 1440 |
| Melting Onset (Solidus), °C | 1270 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 480 |
| Thermal Conductivity, W/m-K | 8.5 | |
| 17 |
| Thermal Expansion, µm/m-K | 14 | |
| 11 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 100 | |
| 13 |
| Density, g/cm3 | 8.1 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 6.2 | |
| 2.8 |
| Embodied Energy, MJ/kg | 84 | |
| 39 |
| Embodied Water, L/kg | 440 | |
| 130 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 31 | |
| 94 to 160 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 160 | |
| 850 to 4400 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 19 | |
| 35 to 50 |
| Strength to Weight: Bending, points | 19 | |
| 28 to 36 |
| Thermal Diffusivity, mm2/s | 2.2 | |
| 4.5 |
| Thermal Shock Resistance, points | 14 | |
| 33 to 47 |
Alloy Composition
| Carbon (C), % | 0.050 to 0.25 | |
| 0 to 0.050 |
| Chromium (Cr), % | 27 to 30 | |
| 14 to 16 |
| Cobalt (Co), % | 48 to 52 | |
| 0 |
| Copper (Cu), % | 0 | |
| 1.3 to 1.8 |
| Iron (Fe), % | 9.7 to 24.5 | |
| 72.1 to 79.3 |
| Manganese (Mn), % | 0 to 1.5 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 to 0.5 | |
| 0.5 to 1.0 |
| Nickel (Ni), % | 0 to 4.0 | |
| 5.0 to 7.0 |
| 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 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |