R30003 Cobalt vs. EN 1.4028 Stainless Steel
R30003 cobalt belongs to the cobalt alloys classification, while EN 1.4028 stainless steel belongs to the iron alloys. They have a modest 30% 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 (5, in this case) are not shown.
For each property being compared, the top bar is R30003 cobalt and the bottom bar is EN 1.4028 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 10 to 73 | |
| 11 to 17 |
| Fatigue Strength, MPa | 320 to 560 | |
| 230 to 400 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 83 | |
| 76 |
| Tensile Strength: Ultimate (UTS), MPa | 970 to 1720 | |
| 660 to 930 |
| Tensile Strength: Yield (Proof), MPa | 510 to 1090 | |
| 390 to 730 |
Thermal Properties
| Latent Heat of Fusion, J/g | 310 | |
| 270 |
| Melting Completion (Liquidus), °C | 1400 | |
| 1440 |
| Melting Onset (Solidus), °C | 1440 | |
| 1400 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Conductivity, W/m-K | 13 | |
| 30 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 2.8 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 3.2 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 95 | |
| 7.0 |
| Density, g/cm3 | 8.4 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 8.0 | |
| 1.9 |
| Embodied Energy, MJ/kg | 110 | |
| 27 |
| Embodied Water, L/kg | 400 | |
| 100 |
Common Calculations
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 600 to 2790 | |
| 380 to 1360 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 24 | |
| 25 |
| Strength to Weight: Axial, points | 32 to 57 | |
| 24 to 33 |
| Strength to Weight: Bending, points | 26 to 38 | |
| 22 to 27 |
| Thermal Diffusivity, mm2/s | 3.3 | |
| 8.1 |
| Thermal Shock Resistance, points | 26 to 45 | |
| 23 to 32 |
Alloy Composition
| Boron (B), % | 0 to 0.1 | |
| 0 |
| Carbon (C), % | 0 to 0.15 | |
| 0.26 to 0.35 |
| Chromium (Cr), % | 19 to 21 | |
| 12 to 14 |
| Cobalt (Co), % | 39 to 41 | |
| 0 |
| Iron (Fe), % | 10 to 20.5 | |
| 83.1 to 87.7 |
| Manganese (Mn), % | 1.5 to 2.5 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 6.0 to 8.0 | |
| 0 |
| Nickel (Ni), % | 14 to 16 | |
| 0 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.2 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.015 |