Annealed AISI 205 vs. Annealed R31538 Cobalt
Annealed AISI 205 belongs to the iron alloys classification, while annealed R31538 cobalt belongs to the cobalt alloys. There are 24 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 annealed AISI 205 and the bottom bar is annealed R31538 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Elongation at Break, % | 45 | |
| 23 |
| Fatigue Strength, MPa | 410 | |
| 310 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Reduction in Area, % | 57 | |
| 22 |
| Shear Modulus, GPa | 77 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 800 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 450 | |
| 580 |
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 | 300 | |
| 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 510 | |
| 750 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 26 | |
| 24 |
| Strength to Weight: Axial, points | 29 | |
| 34 |
| Strength to Weight: Bending, points | 25 | |
| 27 |
| Thermal Shock Resistance, points | 16 | |
| 25 |
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 |