R30075 Cobalt vs. EN 1.4401 Stainless Steel
R30075 cobalt belongs to the cobalt alloys classification, while EN 1.4401 stainless steel belongs to the iron alloys. They have a modest 21% of their average alloy composition in common, which, by itself, doesn't mean much. There are 27 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 R30075 cobalt and the bottom bar is EN 1.4401 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 to 250 | |
| 200 |
| Elongation at Break, % | 12 | |
| 14 to 40 |
| Fatigue Strength, MPa | 250 to 840 | |
| 200 to 320 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 82 to 98 | |
| 78 |
| Tensile Strength: Ultimate (UTS), MPa | 780 to 1280 | |
| 600 to 900 |
| Tensile Strength: Yield (Proof), MPa | 480 to 840 | |
| 230 to 570 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 290 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1440 |
| Melting Onset (Solidus), °C | 1290 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 13 | |
| 15 |
| Thermal Expansion, µm/m-K | 12 | |
| 16 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 2.3 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 2.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 7.9 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 3.8 |
| Embodied Energy, MJ/kg | 110 | |
| 52 |
| Embodied Water, L/kg | 530 | |
| 150 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 84 to 140 | |
| 110 to 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 560 to 1410 | |
| 130 to 800 |
| Stiffness to Weight: Axial, points | 14 to 17 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 to 25 | |
| 25 |
| Strength to Weight: Axial, points | 26 to 42 | |
| 21 to 32 |
| Strength to Weight: Bending, points | 22 to 31 | |
| 20 to 26 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 4.0 |
| Thermal Shock Resistance, points | 21 to 29 | |
| 13 to 20 |
Alloy Composition
| Aluminum (Al), % | 0 to 0.1 | |
| 0 |
| Boron (B), % | 0 to 0.010 | |
| 0 |
| Carbon (C), % | 0 to 0.35 | |
| 0 to 0.070 |
| Chromium (Cr), % | 27 to 30 | |
| 16.5 to 18.5 |
| Cobalt (Co), % | 58.7 to 68 | |
| 0 |
| Iron (Fe), % | 0 to 0.75 | |
| 62.8 to 71.5 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 to 2.0 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 2.0 to 2.5 |
| Nickel (Ni), % | 0 to 0.5 | |
| 10 to 13 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 to 0.1 |
| Phosphorus (P), % | 0 to 0.020 | |
| 0 to 0.045 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.010 | |
| 0 to 0.015 |
| Titanium (Ti), % | 0 to 0.1 | |
| 0 |
| Tungsten (W), % | 0 to 0.2 | |
| 0 |