AISI 317 Stainless Steel vs. R30075 Cobalt
AISI 317 stainless steel belongs to the iron alloys classification, while R30075 cobalt belongs to the cobalt alloys. They have a modest 24% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 material properties with values for both materials. Properties with values for just one material (7, in this case) are not shown.
For each property being compared, the top bar is AISI 317 stainless steel and the bottom bar is R30075 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 210 to 250 |
| Elongation at Break, % | 35 to 55 | |
| 12 |
| Fatigue Strength, MPa | 250 to 330 | |
| 250 to 840 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 79 | |
| 82 to 98 |
| Tensile Strength: Ultimate (UTS), MPa | 580 to 710 | |
| 780 to 1280 |
| Tensile Strength: Yield (Proof), MPa | 250 to 420 | |
| 480 to 840 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 320 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1360 |
| Melting Onset (Solidus), °C | 1380 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Conductivity, W/m-K | 15 | |
| 13 |
| Thermal Expansion, µm/m-K | 17 | |
| 12 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.3 | |
| 2.0 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.6 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.9 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 4.3 | |
| 8.1 |
| Embodied Energy, MJ/kg | 59 | |
| 110 |
| Embodied Water, L/kg | 160 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 210 to 260 | |
| 84 to 140 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 150 to 430 | |
| 560 to 1410 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 to 17 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 to 25 |
| Strength to Weight: Axial, points | 20 to 25 | |
| 26 to 42 |
| Strength to Weight: Bending, points | 20 to 22 | |
| 22 to 31 |
| Thermal Diffusivity, mm2/s | 4.1 | |
| 3.5 |
| Thermal Shock Resistance, points | 12 to 15 | |
| 21 to 29 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.1 |
| Boron (B), % | 0 | |
| 0 to 0.010 |
| Carbon (C), % | 0 to 0.080 | |
| 0 to 0.35 |
| Chromium (Cr), % | 18 to 20 | |
| 27 to 30 |
| Cobalt (Co), % | 0 | |
| 58.7 to 68 |
| Iron (Fe), % | 58 to 68 | |
| 0 to 0.75 |
| Manganese (Mn), % | 0 to 2.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 3.0 to 4.0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 11 to 15 | |
| 0 to 0.5 |
| Nitrogen (N), % | 0 to 0.1 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.045 | |
| 0 to 0.020 |
| Silicon (Si), % | 0 to 0.75 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.010 |
| Titanium (Ti), % | 0 | |
| 0 to 0.1 |
| Tungsten (W), % | 0 | |
| 0 to 0.2 |