R30155 Cobalt vs. AWS E3155
Both R30155 cobalt and AWS E3155 are iron alloys. Their average alloy composition is basically identical. There are 23 material properties with values for both materials. Properties with values for just one material (9, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is AWS E3155.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 210 |
| Elongation at Break, % | 34 | |
| 23 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Shear Modulus, GPa | 81 | |
| 81 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 770 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 310 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1460 |
| Melting Onset (Solidus), °C | 1420 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 450 |
| Thermal Conductivity, W/m-K | 12 | |
| 13 |
| Thermal Expansion, µm/m-K | 14 | |
| 13 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 70 |
| Density, g/cm3 | 8.5 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 7.7 |
| Embodied Energy, MJ/kg | 150 | |
| 110 |
| Embodied Water, L/kg | 300 | |
| 300 |
Common Calculations
| PREN (Pitting Resistance) | 37 | |
| 35 |
| Stiffness to Weight: Axial, points | 14 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 28 | |
| 26 |
| Strength to Weight: Bending, points | 24 | |
| 22 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 3.3 |
| Thermal Shock Resistance, points | 21 | |
| 20 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0 to 0.1 |
| Chromium (Cr), % | 20 to 22.5 | |
| 20 to 22.5 |
| Cobalt (Co), % | 18.5 to 21 | |
| 18.5 to 21 |
| Copper (Cu), % | 0 | |
| 0 to 0.75 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 23.3 to 36.3 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 1.0 to 2.5 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 2.5 to 3.5 |
| Nickel (Ni), % | 19 to 21 | |
| 19 to 21 |
| Niobium (Nb), % | 0.75 to 1.3 | |
| 0.75 to 1.3 |
| 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 0.030 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 2.0 to 3.0 |