R30155 Cobalt vs. S15500 Stainless Steel
Both R30155 cobalt and S15500 stainless steel are iron alloys. They have 51% of their average alloy composition in common. There are 32 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is S15500 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 290 to 430 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 34 | |
| 6.8 to 16 |
| Fatigue Strength, MPa | 310 | |
| 350 to 650 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Reduction in Area, % | 34 | |
| 17 to 40 |
| Shear Modulus, GPa | 81 | |
| 75 |
| Shear Strength, MPa | 570 | |
| 540 to 870 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 890 to 1490 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 590 to 1310 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 280 |
| Maximum Temperature: Corrosion, °C | 570 | |
| 440 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 820 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1430 |
| Melting Onset (Solidus), °C | 1420 | |
| 1380 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Conductivity, W/m-K | 12 | |
| 17 |
| Thermal Expansion, µm/m-K | 14 | |
| 11 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 13 |
| Density, g/cm3 | 8.5 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 2.7 |
| Embodied Energy, MJ/kg | 150 | |
| 39 |
| Embodied Water, L/kg | 300 | |
| 130 |
Common Calculations
| PREN (Pitting Resistance) | 37 | |
| 15 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 98 to 120 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 890 to 4460 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 25 |
| Strength to Weight: Axial, points | 28 | |
| 32 to 53 |
| Strength to Weight: Bending, points | 24 | |
| 26 to 37 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 4.6 |
| Thermal Shock Resistance, points | 21 | |
| 30 to 50 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0 to 0.070 |
| Chromium (Cr), % | 20 to 22.5 | |
| 14 to 15.5 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Copper (Cu), % | 0 | |
| 2.5 to 4.5 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 71.9 to 79.9 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 3.5 to 5.5 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0.15 to 0.45 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| 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 |