EN 1.4378 Stainless Steel vs. R30021 Cobalt
EN 1.4378 stainless steel belongs to the iron alloys classification, while R30021 cobalt belongs to the cobalt alloys. They have a modest 23% of their average alloy composition in common, which, by itself, doesn't mean much. There are 23 material properties with values for both materials. Properties with values for just one material (12, in this case) are not shown.
For each property being compared, the top bar is EN 1.4378 stainless steel and the bottom bar is R30021 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 220 |
| Elongation at Break, % | 14 to 34 | |
| 9.0 |
| Fatigue Strength, MPa | 340 to 550 | |
| 250 |
| Poisson's Ratio | 0.28 | |
| 0.29 |
| Shear Modulus, GPa | 77 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 760 to 1130 | |
| 700 |
| Tensile Strength: Yield (Proof), MPa | 430 to 970 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 330 |
| Melting Completion (Liquidus), °C | 1390 | |
| 1350 |
| Melting Onset (Solidus), °C | 1350 | |
| 1190 |
| Specific Heat Capacity, J/kg-K | 480 | |
| 450 |
| Thermal Expansion, µm/m-K | 17 | |
| 11 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.6 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 2.7 | |
| 8.0 |
| Embodied Energy, MJ/kg | 39 | |
| 110 |
| Embodied Water, L/kg | 150 | |
| 520 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 150 to 220 | |
| 57 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 470 to 2370 | |
| 570 |
| Stiffness to Weight: Axial, points | 14 | |
| 15 |
| Stiffness to Weight: Bending, points | 25 | |
| 24 |
| Strength to Weight: Axial, points | 28 to 41 | |
| 23 |
| Strength to Weight: Bending, points | 24 to 31 | |
| 21 |
| Thermal Shock Resistance, points | 16 to 23 | |
| 21 |
Alloy Composition
| Carbon (C), % | 0 to 0.080 | |
| 0.2 to 0.35 |
| Chromium (Cr), % | 17 to 19 | |
| 26 to 29 |
| Cobalt (Co), % | 0 | |
| 61.7 to 67.3 |
| Iron (Fe), % | 61.2 to 69 | |
| 0 to 3.0 |
| Manganese (Mn), % | 11.5 to 14.5 | |
| 0 |
| Molybdenum (Mo), % | 0 | |
| 4.5 to 6.0 |
| Nickel (Ni), % | 2.3 to 3.7 | |
| 2.0 to 3.0 |
| Nitrogen (N), % | 0.2 to 0.4 | |
| 0 |
| Phosphorus (P), % | 0 to 0.060 | |
| 0 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.5 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 |