EN 1.4938 Stainless Steel vs. R31233 Cobalt
EN 1.4938 stainless steel belongs to the iron alloys classification, while R31233 cobalt belongs to the cobalt alloys. They have a modest 20% 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 (5, in this case) are not shown.
For each property being compared, the top bar is EN 1.4938 stainless steel and the bottom bar is R31233 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Elongation at Break, % | 16 to 17 | |
| 17 |
| Fatigue Strength, MPa | 390 to 520 | |
| 220 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 76 | |
| 85 |
| Tensile Strength: Ultimate (UTS), MPa | 870 to 1030 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 640 to 870 | |
| 420 |
Thermal Properties
| Latent Heat of Fusion, J/g | 270 | |
| 320 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1350 |
| Melting Onset (Solidus), °C | 1420 | |
| 1330 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 440 |
| Thermal Conductivity, W/m-K | 30 | |
| 12 |
| Thermal Expansion, µm/m-K | 11 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.9 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 3.3 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 8.6 |
| Embodied Carbon, kg CO2/kg material | 3.3 | |
| 8.4 |
| Embodied Energy, MJ/kg | 47 | |
| 110 |
| Embodied Water, L/kg | 110 | |
| 480 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 160 | |
| 140 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1050 to 1920 | |
| 410 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 23 |
| Strength to Weight: Axial, points | 31 to 37 | |
| 33 |
| Strength to Weight: Bending, points | 26 to 29 | |
| 26 |
| Thermal Diffusivity, mm2/s | 8.1 | |
| 3.2 |
| Thermal Shock Resistance, points | 30 to 35 | |
| 25 |
Alloy Composition
| Boron (B), % | 0 | |
| 0 to 0.015 |
| Carbon (C), % | 0.080 to 0.15 | |
| 0.020 to 0.1 |
| Chromium (Cr), % | 11 to 12.5 | |
| 23.5 to 27.5 |
| Cobalt (Co), % | 0 | |
| 44.7 to 63.3 |
| Iron (Fe), % | 80.5 to 84.8 | |
| 1.0 to 5.0 |
| Manganese (Mn), % | 0.4 to 0.9 | |
| 0.1 to 1.5 |
| Molybdenum (Mo), % | 1.5 to 2.0 | |
| 4.0 to 6.0 |
| Nickel (Ni), % | 2.0 to 3.0 | |
| 7.0 to 11 |
| Nitrogen (N), % | 0.020 to 0.040 | |
| 0.030 to 0.12 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 0.5 | |
| 0.050 to 1.0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.020 |
| Tungsten (W), % | 0 | |
| 1.0 to 3.0 |
| Vanadium (V), % | 0.25 to 0.4 | |
| 0 |