R30075 Cobalt vs. EN 1.7767 Steel
R30075 cobalt belongs to the cobalt alloys classification, while EN 1.7767 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 R30075 cobalt and the bottom bar is EN 1.7767 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 to 250 | |
| 190 |
| Elongation at Break, % | 12 | |
| 20 |
| Fatigue Strength, MPa | 250 to 840 | |
| 320 to 340 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 82 to 98 | |
| 74 |
| Tensile Strength: Ultimate (UTS), MPa | 780 to 1280 | |
| 670 to 690 |
| Tensile Strength: Yield (Proof), MPa | 480 to 840 | |
| 460 to 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 250 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1470 |
| Melting Onset (Solidus), °C | 1290 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 13 | |
| 40 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 7.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 8.9 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 2.4 |
| Embodied Energy, MJ/kg | 110 | |
| 33 |
| Embodied Water, L/kg | 530 | |
| 64 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 140 | |
| 120 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 560 to 1410 | |
| 570 to 650 |
| Stiffness to Weight: Axial, points | 14 to 17 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 to 25 | |
| 24 |
| Strength to Weight: Axial, points | 26 to 42 | |
| 24 |
| Strength to Weight: Bending, points | 22 to 31 | |
| 22 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 11 |
| Thermal Shock Resistance, points | 21 to 29 | |
| 19 to 20 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.1 | |
| 0 |
| Boron (B), % | 0 to 0.010 | |
| 0 |
| Carbon (C), % | 0 to 0.35 | |
| 0.1 to 0.15 |
| Chromium (Cr), % | 27 to 30 | |
| 2.8 to 3.3 |
| Cobalt (Co), % | 58.7 to 68 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 0 to 0.75 | |
| 93.8 to 95.8 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 0.9 to 1.1 |
| Nickel (Ni), % | 0 to 0.5 | |
| 0 to 0.25 |
| Niobium (Nb), % | 0 | |
| 0 to 0.070 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 to 0.012 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.15 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.0050 |
| Titanium (Ti), % | 0 to 0.1 | |
| 0 to 0.030 |
| Tungsten (W), % | 0 to 0.2 | |
| 0 |
| Vanadium (V), % | 0 | |
| 0.2 to 0.3 |