R30155 Cobalt vs. SAE-AISI 4150 Steel
Both R30155 cobalt and SAE-AISI 4150 steel are iron alloys. They have a modest 33% of their average alloy composition in common, which, by itself, doesn't mean much. There are 29 material properties with values for both materials. Properties with values for just one material (5, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is SAE-AISI 4150 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 200 to 380 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 34 | |
| 12 to 20 |
| Fatigue Strength, MPa | 310 | |
| 260 to 780 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 73 |
| Shear Strength, MPa | 570 | |
| 410 to 800 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 660 to 1310 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 380 to 1220 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 250 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 420 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 12 | |
| 42 |
| Thermal Expansion, µm/m-K | 14 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 2.4 |
| Density, g/cm3 | 8.5 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 1.5 |
| Embodied Energy, MJ/kg | 150 | |
| 20 |
| Embodied Water, L/kg | 300 | |
| 51 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 82 to 180 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 380 to 3930 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 28 | |
| 24 to 47 |
| Strength to Weight: Bending, points | 24 | |
| 22 to 34 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 11 |
| Thermal Shock Resistance, points | 21 | |
| 19 to 39 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0.48 to 0.53 |
| Chromium (Cr), % | 20 to 22.5 | |
| 0.8 to 1.1 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 96.7 to 97.7 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0.75 to 1.0 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0.15 to 0.25 |
| Nickel (Ni), % | 19 to 21 | |
| 0 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.035 |
| Silicon (Si), % | 0 to 1.0 | |
| 0.15 to 0.35 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.040 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |