EN 1.7710 Steel vs. R31539 Cobalt
EN 1.7710 steel belongs to the iron alloys classification, while R31539 cobalt belongs to the cobalt 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 EN 1.7710 steel and the bottom bar is R31539 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 |
| Elongation at Break, % | 6.8 to 11 | |
| 13 to 22 |
| Fatigue Strength, MPa | 500 to 620 | |
| 310 to 480 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 930 to 1070 | |
| 1000 to 1340 |
| Tensile Strength: Yield (Proof), MPa | 800 to 1060 | |
| 590 to 940 |
Thermal Properties
| Latent Heat of Fusion, J/g | 260 | |
| 320 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1360 |
| Melting Onset (Solidus), °C | 1430 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Conductivity, W/m-K | 41 | |
| 13 |
| Thermal Expansion, µm/m-K | 13 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 7.5 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 8.6 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 2.2 | |
| 8.2 |
| Embodied Energy, MJ/kg | 30 | |
| 110 |
| Embodied Water, L/kg | 57 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 73 to 100 | |
| 140 to 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1680 to 2970 | |
| 780 to 2000 |
| Stiffness to Weight: Axial, points | 13 | |
| 15 |
| Stiffness to Weight: Bending, points | 24 | |
| 24 |
| Strength to Weight: Axial, points | 33 to 38 | |
| 33 to 44 |
| Strength to Weight: Bending, points | 27 to 30 | |
| 27 to 32 |
| Thermal Diffusivity, mm2/s | 11 | |
| 3.5 |
| Thermal Shock Resistance, points | 27 to 31 | |
| 24 to 32 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0.3 to 1.0 |
| Carbon (C), % | 0.12 to 0.18 | |
| 0 to 0.14 |
| Chromium (Cr), % | 1.3 to 1.8 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 57.7 to 68.7 |
| Iron (Fe), % | 95.1 to 97 | |
| 0 to 0.75 |
| Lanthanum (La), % | 0 | |
| 0.030 to 0.2 |
| Manganese (Mn), % | 0.6 to 1.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0.8 to 1.0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 0 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.025 | |
| 0 |
| Silicon (Si), % | 0 to 0.6 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Vanadium (V), % | 0.15 to 0.25 | |
| 0 |