EN 1.1221 Steel vs. R30816 Cobalt
EN 1.1221 steel belongs to the iron alloys classification, while R30816 cobalt belongs to the cobalt alloys. There are 26 material properties with values for both materials. Properties with values for just one material (6, in this case) are not shown.
For each property being compared, the top bar is EN 1.1221 steel and the bottom bar is R30816 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 210 to 250 | |
| 280 |
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 210 |
| Elongation at Break, % | 10 to 21 | |
| 23 |
| Fatigue Strength, MPa | 240 to 340 | |
| 250 |
| Poisson's Ratio | 0.29 | |
| 0.3 |
| Shear Modulus, GPa | 72 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 730 to 870 | |
| 1020 |
| Tensile Strength: Yield (Proof), MPa | 390 to 550 | |
| 460 |
Thermal Properties
| Latent Heat of Fusion, J/g | 250 | |
| 300 |
| Melting Completion (Liquidus), °C | 1460 | |
| 1540 |
| Melting Onset (Solidus), °C | 1410 | |
| 1460 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 420 |
| Thermal Conductivity, W/m-K | 48 | |
| 13 |
| Thermal Expansion, µm/m-K | 12 | |
| 12 |
Otherwise Unclassified Properties
| Density, g/cm3 | 7.8 | |
| 9.1 |
| Embodied Carbon, kg CO2/kg material | 1.5 | |
| 20 |
| Embodied Energy, MJ/kg | 19 | |
| 320 |
| Embodied Water, L/kg | 47 | |
| 440 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 67 to 130 | |
| 190 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 410 to 800 | |
| 510 |
| Stiffness to Weight: Axial, points | 13 | |
| 13 |
| Stiffness to Weight: Bending, points | 24 | |
| 22 |
| Strength to Weight: Axial, points | 26 to 31 | |
| 31 |
| Strength to Weight: Bending, points | 23 to 26 | |
| 25 |
| Thermal Diffusivity, mm2/s | 13 | |
| 3.3 |
| Thermal Shock Resistance, points | 23 to 28 | |
| 28 |
Alloy Composition
| Carbon (C), % | 0.57 to 0.65 | |
| 0.32 to 0.42 |
| Chromium (Cr), % | 0 to 0.4 | |
| 19 to 21 |
| Cobalt (Co), % | 0 | |
| 40 to 49.8 |
| Iron (Fe), % | 97.1 to 98.8 | |
| 0 to 5.0 |
| Manganese (Mn), % | 0.6 to 0.9 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 0 to 0.1 | |
| 3.5 to 4.5 |
| Nickel (Ni), % | 0 to 0.4 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 3.5 to 4.5 |
| Phosphorus (P), % | 0 to 0.035 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.4 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.035 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 3.5 to 4.5 |
| Tungsten (W), % | 0 | |
| 3.5 to 4.5 |