AISI 205 Stainless Steel vs. R31538 Cobalt
AISI 205 stainless steel belongs to the iron alloys classification, while R31538 cobalt belongs to the cobalt alloys. There are 23 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is AISI 205 stainless steel and the bottom bar is R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Elongation at Break, % | 11 to 51 | |
| 13 to 23 |
| Fatigue Strength, MPa | 410 to 640 | |
| 310 to 480 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 800 to 1430 | |
| 1020 to 1360 |
| Tensile Strength: Yield (Proof), MPa | 450 to 1100 | |
| 580 to 930 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 320 |
| Melting Completion (Liquidus), °C | 1380 | |
| 1360 |
| Melting Onset (Solidus), °C | 1340 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 450 |
| Thermal Expansion, µm/m-K | 18 | |
| 13 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.6 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 2.6 | |
| 8.1 |
| Embodied Energy, MJ/kg | 37 | |
| 110 |
| Embodied Water, L/kg | 150 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 150 to 430 | |
| 140 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 to 3060 | |
| 750 to 1920 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 26 | |
| 24 |
| Strength to Weight: Axial, points | 29 to 52 | |
| 34 to 45 |
| Strength to Weight: Bending, points | 25 to 37 | |
| 27 to 32 |
| Thermal Shock Resistance, points | 16 to 29 | |
| 25 to 33 |
Alloy Composition
| Carbon (C), % | 0.12 to 0.25 | |
| 0.15 to 0.35 |
| Chromium (Cr), % | 16.5 to 18.5 | |
| 26 to 30 |
| Cobalt (Co), % | 0 | |
| 58.7 to 68.9 |
| Iron (Fe), % | 62.6 to 68.1 | |
| 0 to 0.75 |
| Manganese (Mn), % | 14 to 15.5 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 1.0 to 1.7 | |
| 0 to 1.0 |
| Nitrogen (N), % | 0.32 to 0.4 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.060 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |