R30155 Cobalt vs. SAE-AISI H21 Steel
Both R30155 cobalt and SAE-AISI H21 steel are iron alloys. They have a modest 37% 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 (10, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is SAE-AISI H21 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 76 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 720 to 1790 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 250 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1630 |
| Melting Onset (Solidus), °C | 1420 | |
| 1580 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 440 |
| Thermal Conductivity, W/m-K | 12 | |
| 27 |
| Thermal Expansion, µm/m-K | 14 | |
| 11 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 23 |
| Density, g/cm3 | 8.5 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 4.5 |
| Embodied Energy, MJ/kg | 150 | |
| 68 |
| Embodied Water, L/kg | 300 | |
| 72 |
Common Calculations
| PREN (Pitting Resistance) | 37 | |
| 19 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 23 |
| Strength to Weight: Axial, points | 28 | |
| 23 to 58 |
| Strength to Weight: Bending, points | 24 | |
| 21 to 38 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 7.1 |
| Thermal Shock Resistance, points | 21 | |
| 24 to 59 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0.28 to 0.36 |
| Chromium (Cr), % | 20 to 22.5 | |
| 3.0 to 3.8 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 87.6 to 93.8 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0.15 to 0.4 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 0 to 0.3 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.030 |
| Silicon (Si), % | 0 to 1.0 | |
| 0.15 to 0.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 8.5 to 10 |
| Vanadium (V), % | 0 | |
| 0.3 to 0.6 |