R30155 Cobalt vs. EN 1.4057 Stainless Steel
Both R30155 cobalt and EN 1.4057 stainless steel are iron alloys. They have 50% of their average alloy composition in common. There are 30 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 R30155 cobalt and the bottom bar is EN 1.4057 stainless steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 200 |
| Elongation at Break, % | 34 | |
| 11 to 17 |
| Fatigue Strength, MPa | 310 | |
| 320 to 430 |
| Poisson's Ratio | 0.29 | |
| 0.28 |
| Shear Modulus, GPa | 81 | |
| 77 |
| Shear Strength, MPa | 570 | |
| 520 to 580 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 840 to 980 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 530 to 790 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 280 |
| Maximum Temperature: Corrosion, °C | 570 | |
| 400 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 850 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1440 |
| Melting Onset (Solidus), °C | 1420 | |
| 1390 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 480 |
| Thermal Conductivity, W/m-K | 12 | |
| 25 |
| Thermal Expansion, µm/m-K | 14 | |
| 10 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 9.5 |
| Density, g/cm3 | 8.5 | |
| 7.7 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 2.2 |
| Embodied Energy, MJ/kg | 150 | |
| 32 |
| Embodied Water, L/kg | 300 | |
| 120 |
Common Calculations
| PREN (Pitting Resistance) | 37 | |
| 16 |
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 96 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 700 to 1610 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 25 |
| Strength to Weight: Axial, points | 28 | |
| 30 to 35 |
| Strength to Weight: Bending, points | 24 | |
| 26 to 28 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 6.7 |
| Thermal Shock Resistance, points | 21 | |
| 30 to 35 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0.12 to 0.22 |
| Chromium (Cr), % | 20 to 22.5 | |
| 15 to 17 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 77.7 to 83.4 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0 to 1.5 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 1.5 to 2.5 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0 |
| Nitrogen (N), % | 0 to 0.2 | |
| 0 |
| Phosphorus (P), % | 0 to 0.040 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.015 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |