R30155 Cobalt vs. AISI 317 Stainless Steel
Both R30155 cobalt and AISI 317 stainless steel are iron alloys. They have 67% of their average alloy composition in common. There are 31 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 R30155 cobalt and the bottom bar is AISI 317 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 170 to 220 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 34 | |
| 35 to 55 |
| Fatigue Strength, MPa | 310 | |
| 250 to 330 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 79 |
| Shear Strength, MPa | 570 | |
| 420 to 470 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 580 to 710 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 250 to 420 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 570 | |
| 420 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 590 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1400 |
| Melting Onset (Solidus), °C | 1420 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 12 | |
| 15 |
| Thermal Expansion, µm/m-K | 14 | |
| 17 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 21 |
| Density, g/cm3 | 8.5 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 4.3 |
| Embodied Energy, MJ/kg | 150 | |
| 59 |
| Embodied Water, L/kg | 300 | |
| 160 |
Common Calculations
| PREN (Pitting Resistance) | 37 | |
| 31 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 210 to 260 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 150 to 430 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 25 |
| Strength to Weight: Axial, points | 28 | |
| 20 to 25 |
| Strength to Weight: Bending, points | 24 | |
| 20 to 22 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 4.1 |
| Thermal Shock Resistance, points | 21 | |
| 12 to 15 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0 to 0.080 |
| Chromium (Cr), % | 20 to 22.5 | |
| 18 to 20 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 58 to 68 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 3.0 to 4.0 |
| Nickel (Ni), % | 19 to 21 | |
| 11 to 15 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0 to 0.1 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.75 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |