R30816 Cobalt vs. EN 1.7703 Steel
R30816 cobalt belongs to the cobalt alloys classification, while EN 1.7703 steel belongs to the iron alloys. There are 26 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is EN 1.7703 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 200 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 23 | |
| 20 |
| Fatigue Strength, MPa | 250 | |
| 320 to 340 |
| Poisson's Ratio | 0.3 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 74 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 670 to 690 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 460 to 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 250 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1470 |
| Melting Onset (Solidus), °C | 1460 | |
| 1430 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 470 |
| Thermal Conductivity, W/m-K | 13 | |
| 39 |
| Thermal Expansion, µm/m-K | 12 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 2.5 |
| Embodied Energy, MJ/kg | 320 | |
| 35 |
| Embodied Water, L/kg | 440 | |
| 61 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 120 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 570 to 650 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 22 | |
| 24 |
| Strength to Weight: Axial, points | 31 | |
| 24 |
| Strength to Weight: Bending, points | 25 | |
| 22 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 11 |
| Thermal Shock Resistance, points | 28 | |
| 19 to 20 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0.11 to 0.15 |
| Chromium (Cr), % | 19 to 21 | |
| 2.0 to 2.5 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.2 |
| Iron (Fe), % | 0 to 5.0 | |
| 94.6 to 96.4 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0.3 to 0.6 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0.9 to 1.1 |
| Nickel (Ni), % | 19 to 21 | |
| 0 to 0.25 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 to 0.070 |
| Nitrogen (N), % | 0 | |
| 0 to 0.012 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.1 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.0050 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 0 to 0.030 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |
| Vanadium (V), % | 0 | |
| 0.25 to 0.35 |