R30816 Cobalt vs. S46500 Stainless Steel
R30816 cobalt belongs to the cobalt alloys classification, while S46500 stainless steel belongs to the iron alloys. They have a modest 27% of their average alloy composition in common, which, by itself, doesn't mean much. There are 22 material properties with values for both materials. Properties with values for just one material (11, in this case) are not shown.
For each property being compared, the top bar is R30816 cobalt and the bottom bar is S46500 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 23 | |
| 2.3 to 14 |
| Fatigue Strength, MPa | 250 | |
| 550 to 890 |
| Poisson's Ratio | 0.3 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 75 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 | |
| 1260 to 1930 |
| Tensile Strength: Yield (Proof), MPa | 460 | |
| 1120 to 1810 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 280 |
| Melting Completion (Liquidus), °C | 1540 | |
| 1450 |
| Melting Onset (Solidus), °C | 1460 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 420 | |
| 470 |
| Thermal Expansion, µm/m-K | 12 | |
| 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 9.1 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 20 | |
| 3.6 |
| Embodied Energy, MJ/kg | 320 | |
| 51 |
| Embodied Water, L/kg | 440 | |
| 120 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 190 | |
| 43 to 210 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 22 | |
| 25 |
| Strength to Weight: Axial, points | 31 | |
| 44 to 68 |
| Strength to Weight: Bending, points | 25 | |
| 33 to 44 |
| Thermal Shock Resistance, points | 28 | |
| 44 to 67 |
Alloy Composition
| Carbon (C), % | 0.32 to 0.42 | |
| 0 to 0.020 |
| Chromium (Cr), % | 19 to 21 | |
| 11 to 12.5 |
| Cobalt (Co), % | 40 to 49.8 | |
| 0 |
| Iron (Fe), % | 0 to 5.0 | |
| 72.6 to 76.1 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 0.25 |
| Molybdenum (Mo), % | 3.5 to 4.5 | |
| 0.75 to 1.3 |
| Nickel (Ni), % | 19 to 21 | |
| 10.7 to 11.3 |
| Niobium (Nb), % | 3.5 to 4.5 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.010 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.015 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.25 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.010 |
| Tantalum (Ta), % | 3.5 to 4.5 | |
| 0 |
| Titanium (Ti), % | 0 | |
| 1.5 to 1.8 |
| Tungsten (W), % | 3.5 to 4.5 | |
| 0 |