EN 1.4618 Stainless Steel vs. R31537 Cobalt
EN 1.4618 stainless steel belongs to the iron alloys classification, while R31537 cobalt belongs to the cobalt alloys. There are 27 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 1.4618 stainless steel and the bottom bar is R31537 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Elongation at Break, % | 51 | |
| 14 to 23 |
| Fatigue Strength, MPa | 240 to 250 | |
| 310 to 480 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 87 |
| Tensile Strength: Ultimate (UTS), MPa | 680 to 700 | |
| 1000 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 250 to 260 | |
| 590 to 940 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 320 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1360 |
| Melting Onset (Solidus), °C | 1360 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 450 |
| Thermal Conductivity, W/m-K | 15 | |
| 13 |
| Thermal Expansion, µm/m-K | 16 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.4 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.7 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 2.7 | |
| 8.1 |
| Embodied Energy, MJ/kg | 39 | |
| 110 |
| Embodied Water, L/kg | 150 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 270 to 280 | |
| 140 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 160 to 170 | |
| 780 to 1990 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 24 to 25 | |
| 33 to 44 |
| Strength to Weight: Bending, points | 22 to 23 | |
| 26 to 32 |
| Thermal Diffusivity, mm2/s | 4.0 | |
| 3.4 |
| Thermal Shock Resistance, points | 15 to 16 | |
| 24 to 32 |
Alloy Composition
| Carbon (C), % | 0 to 0.1 | |
| 0 to 0.14 |
| Chromium (Cr), % | 16.5 to 18.5 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 58.9 to 69 |
| Copper (Cu), % | 1.0 to 2.5 | |
| 0 |
| Iron (Fe), % | 62.7 to 72.5 | |
| 0 to 0.75 |
| Manganese (Mn), % | 5.5 to 9.5 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 4.5 to 5.5 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 to 0.15 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.070 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 |