R30155 Cobalt vs. SAE-AISI 1095 Steel
Both R30155 cobalt and SAE-AISI 1095 steel are iron alloys. They have a modest 31% of their average alloy composition in common, which, by itself, doesn't mean much. There are 30 material properties with values for both materials. Properties with values for just one material (4, in this case) are not shown.
For each property being compared, the top bar is R30155 cobalt and the bottom bar is SAE-AISI 1095 steel.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 220 | |
| 200 to 270 |
| Elastic (Young's, Tensile) Modulus, GPa | 210 | |
| 190 |
| Elongation at Break, % | 34 | |
| 10 to 11 |
| Fatigue Strength, MPa | 310 | |
| 310 to 370 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 34 | |
| 28 to 45 |
| Shear Modulus, GPa | 81 | |
| 72 |
| Shear Strength, MPa | 570 | |
| 400 to 540 |
| Tensile Strength: Ultimate (UTS), MPa | 850 | |
| 680 to 900 |
| Tensile Strength: Yield (Proof), MPa | 390 | |
| 500 to 590 |
Thermal Properties
| Latent Heat of Fusion, J/g | 300 | |
| 240 |
| Maximum Temperature: Mechanical, °C | 1100 | |
| 400 |
| Melting Completion (Liquidus), °C | 1470 | |
| 1450 |
| Melting Onset (Solidus), °C | 1420 | |
| 1410 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 470 |
| Thermal Conductivity, W/m-K | 12 | |
| 47 |
| Thermal Expansion, µm/m-K | 14 | |
| 12 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 80 | |
| 1.8 |
| Density, g/cm3 | 8.5 | |
| 7.8 |
| Embodied Carbon, kg CO2/kg material | 9.7 | |
| 1.4 |
| Embodied Energy, MJ/kg | 150 | |
| 19 |
| Embodied Water, L/kg | 300 | |
| 45 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 230 | |
| 63 to 84 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 370 | |
| 660 to 930 |
| Stiffness to Weight: Axial, points | 14 | |
| 13 |
| Stiffness to Weight: Bending, points | 23 | |
| 24 |
| Strength to Weight: Axial, points | 28 | |
| 24 to 32 |
| Strength to Weight: Bending, points | 24 | |
| 22 to 26 |
| Thermal Diffusivity, mm2/s | 3.2 | |
| 13 |
| Thermal Shock Resistance, points | 21 | |
| 22 to 29 |
Alloy Composition
| Carbon (C), % | 0.080 to 0.16 | |
| 0.9 to 1.0 |
| Chromium (Cr), % | 20 to 22.5 | |
| 0 |
| Cobalt (Co), % | 18.5 to 21 | |
| 0 |
| Iron (Fe), % | 24.3 to 36.2 | |
| 98.4 to 98.8 |
| Manganese (Mn), % | 1.0 to 2.0 | |
| 0.3 to 0.5 |
| Molybdenum (Mo), % | 2.5 to 3.5 | |
| 0 |
| Nickel (Ni), % | 19 to 21 | |
| 0 |
| 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 |
| Sulfur (S), % | 0 to 0.030 | |
| 0 to 0.050 |
| Tantalum (Ta), % | 0.75 to 1.3 | |
| 0 |
| Tungsten (W), % | 2.0 to 3.0 | |
| 0 |