R30816 Cobalt vs. AISI 201 Stainless Steel
R30816 cobalt belongs to the cobalt alloys classification, while AISI 201 stainless steel belongs to the iron alloys. They have a modest 26% of their average alloy composition in common, which, by itself, doesn't mean much. 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 201 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 280 | |
| 200 to 440 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 23 | |
| 4.6 to 51 |
| Fatigue Strength, MPa | 250 | |
| 280 to 600 |
| Poisson's Ratio | 0.3 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 77 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 650 to 1450 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 300 to 1080 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 280 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1410 |
| Melting Onset (Solidus), °C | 1460 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 480 |
| Thermal Conductivity, W/m-K | 13 | |
| 15 |
| Thermal Expansion, µm/m-K | 12 | |
| 17 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 2.6 |
| Embodied Energy, MJ/kg | 320 | |
| 38 |
| Embodied Water, L/kg | 440 | |
| 140 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 61 to 340 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 230 to 2970 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 22 | |
| 25 |
| Strength to Weight: Axial, points | 31 | |
| 23 to 52 |
| Strength to Weight: Bending, points | 25 | |
| 22 to 37 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 4.0 |
| Thermal Shock Resistance, points | 28 | |
| 14 to 32 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0 to 0.15 |
| Chromium (Cr), % | 19 to 21 | |
| 16 to 18 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Iron (Fe), % | 0 to 5.0 | |
| 67.5 to 75 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 5.5 to 7.5 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 3.5 to 5.5 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.060 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| 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 |