R30155 Cobalt vs. S15700 Stainless Steel
Both R30155 cobalt and S15700 stainless steel are iron alloys. They have 56% 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 S15700 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 200 to 460 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 34 | |
| 1.1 to 29 |
| Fatigue Strength, MPa | 310 | |
| 370 to 770 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 77 |
| Shear Strength, MPa | 570 | |
| 770 to 1070 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 1180 to 1890 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 500 to 1770 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 290 |
| Maximum Temperature: Corrosion, °C | 570 | |
| 400 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 870 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1440 |
| Melting Onset (Solidus), °C | 1420 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Conductivity, W/m-K | 12 | |
| 16 |
| Thermal Expansion, µm/m-K | 14 | |
| 11 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 15 |
| Density, g/cm3 | 8.5 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 3.4 |
| Embodied Energy, MJ/kg | 150 | |
| 47 |
| Embodied Water, L/kg | 300 | |
| 140 |
Common Calculations
| PREN (Pitting Resistance) | 37 | |
| 23 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 17 to 270 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 640 to 4660 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 25 |
| Strength to Weight: Axial, points | 28 | |
| 42 to 67 |
| Strength to Weight: Bending, points | 24 | |
| 32 to 43 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 4.2 |
| Thermal Shock Resistance, points | 21 | |
| 39 to 63 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0.75 to 1.5 |
| Carbon (C), % | 0.080 to 0.16 | |
| 0 to 0.090 |
| Chromium (Cr), % | 20 to 22.5 | |
| 14 to 16 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 69.6 to 76.8 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 2.0 to 3.0 |
| Nickel (Ni), % | 19 to 21 | |
| 6.5 to 7.7 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| 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 |