R30075 Cobalt vs. R30155 Cobalt
R30075 cobalt belongs to the cobalt alloys classification, while R30155 cobalt belongs to the iron alloys. They have 46% of their average alloy composition in common. 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 R30075 cobalt and the bottom bar is R30155 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 to 250 | |
| 210 |
| Elongation at Break, % | 12 | |
| 34 |
| Fatigue Strength, MPa | 250 to 840 | |
| 310 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 20 | |
| 34 |
| Shear Modulus, GPa | 82 to 98 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 780 to 1280 | |
| 850 |
| Tensile Strength: Yield (Proof), MPa | 480 to 840 | |
| 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 300 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1470 |
| Melting Onset (Solidus), °C | 1290 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 450 |
| Thermal Conductivity, W/m-K | 13 | |
| 12 |
| Thermal Expansion, µm/m-K | 12 | |
| 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 9.7 |
| Embodied Energy, MJ/kg | 110 | |
| 150 |
| Embodied Water, L/kg | 530 | |
| 300 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 140 | |
| 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 560 to 1410 | |
| 370 |
| Stiffness to Weight: Axial, points | 14 to 17 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 to 25 | |
| 23 |
| Strength to Weight: Axial, points | 26 to 42 | |
| 28 |
| Strength to Weight: Bending, points | 22 to 31 | |
| 24 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 3.2 |
| Thermal Shock Resistance, points | 21 to 29 | |
| 21 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.1 | |
| 0 |
| Boron (B), % | 0 to 0.010 | |
| 0 |
| Carbon (C), % | 0 to 0.35 | |
| 0.080 to 0.16 |
| Chromium (Cr), % | 27 to 30 | |
| 20 to 22.5 |
| Cobalt (Co), % | 58.7 to 68 | |
| 18.5 to 21 |
| Iron (Fe), % | 0 to 0.75 | |
| 24.3 to 36.2 |
| Manganese (Mn), % | 0 to 1.0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 2.5 to 3.5 |
| Nickel (Ni), % | 0 to 0.5 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 0.75 to 1.3 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 to 0.2 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 0.75 to 1.3 |
| Titanium (Ti), % | 0 to 0.1 | |
| 0 |
| Tungsten (W), % | 0 to 0.2 | |
| 2.0 to 3.0 |