R31538 Cobalt vs. EN 1.4938 Stainless Steel
R31538 cobalt belongs to the cobalt alloys classification, while EN 1.4938 stainless steel belongs to the iron alloys. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is R31538 cobalt and the bottom bar is EN 1.4938 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 200 |
| Elongation at Break, % | 13 to 23 | |
| 16 to 17 |
| Fatigue Strength, MPa | 310 to 480 | |
| 390 to 520 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 86 | |
| 76 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 870 to 1030 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 640 to 870 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 270 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1460 |
| Melting Onset (Solidus), °C | 1290 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 13 | |
| 30 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 2.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 3.3 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 3.3 |
| Embodied Energy, MJ/kg | 110 | |
| 47 |
| Embodied Water, L/kg | 530 | |
| 110 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 140 to 160 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 1050 to 1920 |
| Stiffness to Weight: Axial, points | 15 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 31 to 37 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 26 to 29 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 8.1 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 30 to 35 |
Alloy Composition
| Carbon (C), % | 0.15 to 0.35 | |
| 0.080 to 0.15 |
| Chromium (Cr), % | 26 to 30 | |
| 11 to 12.5 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 0 |
| Iron (Fe), % | 0 to 0.75 | |
| 80.5 to 84.8 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.4 to 0.9 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 1.5 to 2.0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 2.0 to 3.0 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0.020 to 0.040 |
| Phosphorus (P), % | 0 | |
| 0 to 0.025 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.015 |
| Vanadium (V), % | 0 | |
| 0.25 to 0.4 |