R30155 Cobalt vs. S35500 Stainless Steel
Both R30155 cobalt and S35500 stainless steel are iron alloys. They have 55% of their average alloy composition in common. There are 30 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 S35500 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 34 | |
| 14 |
| Fatigue Strength, MPa | 310 | |
| 690 to 730 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 78 |
| Shear Strength, MPa | 570 | |
| 810 to 910 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 1330 to 1490 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 1200 to 1280 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 280 |
| Maximum Temperature: Corrosion, °C | 570 | |
| 440 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 870 |
| 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 | |
| 16 |
| Thermal Expansion, µm/m-K | 14 | |
| 11 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 16 |
| Density, g/cm3 | 8.5 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 3.5 |
| Embodied Energy, MJ/kg | 150 | |
| 47 |
| Embodied Water, L/kg | 300 | |
| 130 |
Common Calculations
| PREN (Pitting Resistance) | 37 | |
| 27 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 180 to 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 3610 to 4100 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 25 |
| Strength to Weight: Axial, points | 28 | |
| 47 to 53 |
| Strength to Weight: Bending, points | 24 | |
| 34 to 37 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 4.4 |
| Thermal Shock Resistance, points | 21 | |
| 44 to 49 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0.1 to 0.15 |
| Chromium (Cr), % | 20 to 22.5 | |
| 15 to 16 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 73.2 to 77.7 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0.5 to 1.3 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 2.5 to 3.2 |
| Nickel (Ni), % | 19 to 21 | |
| 4.0 to 5.0 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0.1 to 0.5 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0.070 to 0.13 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 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 | |
| 0 |