S17400 Stainless Steel vs. R30075 Cobalt
S17400 stainless steel belongs to the iron alloys classification, while R30075 cobalt belongs to the cobalt alloys. There are 28 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is S17400 stainless steel and the bottom bar is R30075 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 to 250 |
| Elongation at Break, % | 11 to 21 | |
| 12 |
| Fatigue Strength, MPa | 380 to 670 | |
| 250 to 840 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Reduction in Area, % | 40 to 62 | |
| 20 |
| Shear Modulus, GPa | 75 | |
| 82 to 98 |
| Tensile Strength: Ultimate (UTS), MPa | 910 to 1390 | |
| 780 to 1280 |
| Tensile Strength: Yield (Proof), MPa | 580 to 1250 | |
| 480 to 840 |
Thermal Properties
| Latent Heat of Fusion, J/g | 280 | |
| 320 |
| Melting Completion (Liquidus), °C | 1440 | |
| 1360 |
| Melting Onset (Solidus), °C | 1400 | |
| 1290 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 450 |
| Thermal Conductivity, W/m-K | 17 | |
| 13 |
| Thermal Expansion, µm/m-K | 11 | |
| 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 | 7.8 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 2.7 | |
| 8.1 |
| Embodied Energy, MJ/kg | 39 | |
| 110 |
| Embodied Water, L/kg | 130 | |
| 530 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 160 | |
| 84 to 140 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 880 to 4060 | |
| 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 | 32 to 49 | |
| 26 to 42 |
| Strength to Weight: Bending, points | 27 to 35 | |
| 22 to 31 |
| Thermal Diffusivity, mm2/s | 4.5 | |
| 3.5 |
| Thermal Shock Resistance, points | 30 to 46 | |
| 21 to 29 |
Alloy Composition
| Aluminum (Al), % | 0 | |
| 0 to 0.1 |
| Boron (B), % | 0 | |
| 0 to 0.010 |
| Carbon (C), % | 0 to 0.070 | |
| 0 to 0.35 |
| Chromium (Cr), % | 15 to 17 | |
| 27 to 30 |
| Cobalt (Co), % | 0 | |
| 58.7 to 68 |
| Copper (Cu), % | 3.0 to 5.0 | |
| 0 |
| Iron (Fe), % | 70.4 to 78.9 | |
| 0 to 0.75 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 to 1.0 |
| Molybdenum (Mo), % | 0 | |
| 5.0 to 7.0 |
| Nickel (Ni), % | 3.0 to 5.0 | |
| 0 to 0.5 |
| Niobium (Nb), % | 0.15 to 0.45 | |
| 0 |
| Nitrogen (N), % | 0 | |
| 0 to 0.25 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.020 |
| Silicon (Si), % | 0 to 1.0 | |
| 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 |