R30155 Cobalt vs. SAE-AISI D2 Steel
Both R30155 cobalt and SAE-AISI D2 steel are iron alloys. They have 44% of their average alloy composition in common. There are 28 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is SAE-AISI D2 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 34 | |
| 5.0 to 16 |
| Fatigue Strength, MPa | 310 | |
| 310 to 860 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 75 |
| Shear Strength, MPa | 570 | |
| 460 to 1160 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 760 to 2000 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 470 to 1510 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 270 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1440 |
| Melting Onset (Solidus), °C | 1420 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Conductivity, W/m-K | 12 | |
| 31 |
| Thermal Expansion, µm/m-K | 14 | |
| 11 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 8.0 |
| Density, g/cm3 | 8.5 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 3.4 |
| Embodied Energy, MJ/kg | 150 | |
| 50 |
| Embodied Water, L/kg | 300 | |
| 100 |
Common Calculations
| PREN (Pitting Resistance) | 37 | |
| 15 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 92 to 100 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 570 to 5940 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 25 |
| Strength to Weight: Axial, points | 28 | |
| 27 to 72 |
| Strength to Weight: Bending, points | 24 | |
| 24 to 46 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 8.3 |
| Thermal Shock Resistance, points | 21 | |
| 25 to 67 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 1.4 to 1.6 |
| Chromium (Cr), % | 20 to 22.5 | |
| 11 to 13 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Copper (Cu), % | 0 | |
| 0 to 0.25 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 81.3 to 86.9 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 0.6 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0.7 to 1.2 |
| 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 to 0.6 |
| 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 | |
| 0 |
| Vanadium (V), % | 0 | |
| 0 to 1.1 |