AISI 305 Stainless Steel vs. R30006 Cobalt
AISI 305 stainless steel belongs to the iron alloys classification, while R30006 cobalt belongs to the cobalt alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is AISI 305 stainless steel and the bottom bar is R30006 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Elongation at Break, % | 34 to 45 | |
| 1.0 |
| Fatigue Strength, MPa | 210 to 280 | |
| 260 |
| Poisson's Ratio | 0.28 | |
| 0.28 |
| Shear Modulus, GPa | 77 | |
| 85 |
| Tensile Strength: Ultimate (UTS), MPa | 580 to 710 | |
| 900 |
| Tensile Strength: Yield (Proof), MPa | 230 to 350 | |
| 540 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 320 |
| Melting Completion (Liquidus), °C | 1450 | |
| 1400 |
| Melting Onset (Solidus), °C | 1400 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 450 |
| Thermal Conductivity, W/m-K | 16 | |
| 15 |
| Thermal Expansion, µm/m-K | 17 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.4 | |
| 1.6 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.7 | |
| 1.7 |
Otherwise Unclassified Properties
| Calomel Potential, mV | -70 | |
| -250 |
| Density, g/cm3 | 7.8 | |
| 8.6 |
| Embodied Carbon, kg CO2/kg material | 3.2 | |
| 7.8 |
| Embodied Energy, MJ/kg | 45 | |
| 110 |
| Embodied Water, L/kg | 150 | |
| 500 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 200 to 210 | |
| 7.8 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 130 to 320 | |
| 670 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 23 |
| Strength to Weight: Axial, points | 20 to 25 | |
| 29 |
| Strength to Weight: Bending, points | 20 to 23 | |
| 24 |
| Thermal Diffusivity, mm2/s | 4.2 | |
| 3.9 |
| Thermal Shock Resistance, points | 13 to 15 | |
| 26 |
Alloy Composition
| Carbon (C), % | 0 to 0.12 | |
| 0.9 to 1.4 |
| Chromium (Cr), % | 17 to 19 | |
| 27 to 32 |
| Cobalt (Co), % | 0 | |
| 48.6 to 68.1 |
| Iron (Fe), % | 65.1 to 72.5 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0 |
| Molybdenum (Mo), % | 0 | |
| 0 to 1.0 |
| Nickel (Ni), % | 10.5 to 13 | |
| 0 to 3.0 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 |
| Silicon (Si), % | 0 to 0.75 | |
| 0 to 2.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |
| Tungsten (W), % | 0 | |
| 4.0 to 6.0 |