EN 1.4655 Stainless Steel vs. R30816 Cobalt
EN 1.4655 stainless steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. They have a modest 29% of their average alloy composition in common, which, by itself, doesn't mean much. There are 25 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 EN 1.4655 stainless steel and the bottom bar is R30816 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 210 |
| Elongation at Break, % | 23 to 25 | |
| 23 |
| Fatigue Strength, MPa | 320 | |
| 250 |
| Poisson's Ratio | 0.27 | |
| 0.3 |
| Shear Modulus, GPa | 78 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 720 to 730 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 450 to 480 | |
| 460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 300 |
| Melting Completion (Liquidus), °C | 1420 | |
| 1540 |
| Melting Onset (Solidus), °C | 1370 | |
| 1460 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 420 |
| Thermal Conductivity, W/m-K | 15 | |
| 13 |
| Thermal Expansion, µm/m-K | 13 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.7 | |
| 9.1 |
| Embodied Carbon, kg CO2/kg material | 2.9 | |
| 20 |
| Embodied Energy, MJ/kg | 41 | |
| 320 |
| Embodied Water, L/kg | 160 | |
| 440 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 150 to 160 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 to 580 | |
| 510 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 25 | |
| 22 |
| Strength to Weight: Axial, points | 26 | |
| 31 |
| Strength to Weight: Bending, points | 23 | |
| 25 |
| Thermal Diffusivity, mm2/s | 4.0 | |
| 3.3 |
| Thermal Shock Resistance, points | 20 | |
| 28 |
Alloy Composition
| Carbon (C), % | 0 to 0.030 | |
| 0.32 to 0.42 |
| Chromium (Cr), % | 22 to 24 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 40 to 49.8 |
| Copper (Cu), % | 1.0 to 3.0 | |
| 0 |
| Iron (Fe), % | 63.6 to 73.4 | |
| 0 to 5.0 |
| Manganese (Mn), % | 0 to 2.0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0.1 to 0.6 | |
| 3.5 to 4.5 |
| Nickel (Ni), % | 3.5 to 5.5 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 3.5 to 4.5 |
| Nitrogen (N), % | 0.050 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 3.5 to 4.5 |
| Tungsten (W), % | 0 | |
| 3.5 to 4.5 |