AISI 205 Stainless Steel vs. R30155 Cobalt
Both AISI 205 stainless steel and R30155 cobalt are iron alloys. They have 51% of their average alloy composition in common. There are 29 material properties with values for both materials. Properties with values for just one material (3, in this case) are not shown.
For each property being compared, the top bar is AISI 205 stainless steel and the bottom bar is R30155 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 440 | |
| 220 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 210 |
| Elongation at Break, % | 11 to 51 | |
| 34 |
| Fatigue Strength, MPa | 410 to 640 | |
| 310 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 81 |
| Shear Strength, MPa | 560 to 850 | |
| 570 |
| Tensile Strength: Ultimate (UTS), MPa | 800 to 1430 | |
| 850 |
| Tensile Strength: Yield (Proof), MPa | 450 to 1100 | |
| 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 300 |
| Maximum Temperature: Corrosion, °C | 410 | |
| 570 |
| Maximum Temperature: Mechanical, °C | 880 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1380 | |
| 1470 |
| Melting Onset (Solidus), °C | 1340 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 450 |
| Thermal Expansion, µm/m-K | 18 | |
| 14 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 11 | |
| 80 |
| Density, g/cm3 | 7.6 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 9.7 |
| Embodied Energy, MJ/kg | 37 | |
| 150 |
| Embodied Water, L/kg | 150 | |
| 300 |
Common Calculations
| PREN (Pitting Resistance) | 23 | |
| 37 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 150 to 430 | |
| 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 to 3060 | |
| 370 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 26 | |
| 23 |
| Strength to Weight: Axial, points | 29 to 52 | |
| 28 |
| Strength to Weight: Bending, points | 25 to 37 | |
| 24 |
| Thermal Shock Resistance, points | 16 to 29 | |
| 21 |
Alloy Composition
| Carbon (C), % | 0.12 to 0.25 | |
| 0.080 to 0.16 |
| Chromium (Cr), % | 16.5 to 18.5 | |
| 20 to 22.5 |
| Cobalt (Co), % | 0 | |
| 18.5 to 21 |
| Iron (Fe), % | 62.6 to 68.1 | |
| 24.3 to 36.2 |
| Manganese (Mn), % | 14 to 15.5 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 2.5 to 3.5 |
| Nickel (Ni), % | 1.0 to 1.7 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 0.75 to 1.3 |
| Nitrogen (N), % | 0.32 to 0.4 | |
| 0 to 0.2 |
| Phosphorus (P), % | 0 to 0.060 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 0.75 to 1.3 |
| Tungsten (W), % | 0 | |
| 2.0 to 3.0 |