R30816 Cobalt vs. AISI 310S Stainless Steel
R30816 cobalt belongs to the cobalt alloys classification, while AISI 310S stainless steel belongs to the iron alloys. They have 44% 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 R30816 cobalt and the bottom bar is AISI 310S stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 170 to 210 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 23 | |
| 34 to 44 |
| Fatigue Strength, MPa | 250 | |
| 250 to 280 |
| Poisson's Ratio | 0.3 | |
| 0.27 |
| Shear Modulus, GPa | 81 | |
| 79 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 600 to 710 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 270 to 350 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 310 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1450 |
| Melting Onset (Solidus), °C | 1460 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 480 |
| Thermal Conductivity, W/m-K | 13 | |
| 16 |
| Thermal Expansion, µm/m-K | 12 | |
| 16 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 4.3 |
| Embodied Energy, MJ/kg | 320 | |
| 61 |
| Embodied Water, L/kg | 440 | |
| 190 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 200 to 220 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 190 to 310 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 22 | |
| 25 |
| Strength to Weight: Axial, points | 31 | |
| 21 to 25 |
| Strength to Weight: Bending, points | 25 | |
| 20 to 22 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 4.1 |
| Thermal Shock Resistance, points | 28 | |
| 14 to 16 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0 to 0.080 |
| Chromium (Cr), % | 19 to 21 | |
| 24 to 26 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Iron (Fe), % | 0 to 5.0 | |
| 48.3 to 57 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 19 to 22 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |