S17700 Stainless Steel vs. R30155 Cobalt
Both S17700 stainless steel and R30155 cobalt are iron alloys. They have 55% of their average alloy composition in common. There are 31 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 S17700 stainless steel and the bottom bar is R30155 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 180 to 430 | |
| 220 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 210 |
| Elongation at Break, % | 1.0 to 23 | |
| 34 |
| Fatigue Strength, MPa | 290 to 560 | |
| 310 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 76 | |
| 81 |
| Shear Strength, MPa | 740 to 940 | |
| 570 |
| Tensile Strength: Ultimate (UTS), MPa | 1180 to 1650 | |
| 850 |
| Tensile Strength: Yield (Proof), MPa | 430 to 1210 | |
| 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 300 |
| Maximum Temperature: Corrosion, °C | 410 | |
| 570 |
| Maximum Temperature: Mechanical, °C | 890 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1470 |
| Melting Onset (Solidus), °C | 1400 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 450 |
| Thermal Conductivity, W/m-K | 15 | |
| 12 |
| Thermal Expansion, µm/m-K | 11 | |
| 14 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 13 | |
| 80 |
| Density, g/cm3 | 7.7 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 2.8 | |
| 9.7 |
| Embodied Energy, MJ/kg | 40 | |
| 150 |
| Embodied Water, L/kg | 150 | |
| 300 |
Common Calculations
| PREN (Pitting Resistance) | 17 | |
| 37 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 15 to 210 | |
| 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 460 to 3750 | |
| 370 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 25 | |
| 23 |
| Strength to Weight: Axial, points | 42 to 59 | |
| 28 |
| Strength to Weight: Bending, points | 32 to 40 | |
| 24 |
| Thermal Diffusivity, mm2/s | 4.1 | |
| 3.2 |
| Thermal Shock Resistance, points | 39 to 54 | |
| 21 |
Alloy Composition
| Aluminum (Al), % | 0.75 to 1.5 | |
| 0 |
| Carbon (C), % | 0 to 0.090 | |
| 0.080 to 0.16 |
| Chromium (Cr), % | 16 to 18 | |
| 20 to 22.5 |
| Cobalt (Co), % | 0 | |
| 18.5 to 21 |
| Iron (Fe), % | 70.5 to 76.8 | |
| 24.3 to 36.2 |
| Manganese (Mn), % | 0 to 1.0 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 | |
| 2.5 to 3.5 |
| Nickel (Ni), % | 6.5 to 7.8 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 0.75 to 1.3 |
| Nitrogen (N), % | 0 | |
| 0 to 0.2 |
| 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 | |
| 0.75 to 1.3 |
| Tungsten (W), % | 0 | |
| 2.0 to 3.0 |