Nickel 684 vs. R30155 Cobalt
Nickel 684 belongs to the nickel alloys classification, while R30155 cobalt belongs to the iron alloys. They have 60% of their average alloy composition in common. There are 28 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 nickel 684 and the bottom bar is R30155 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Brinell Hardness | 310 | |
| 220 |
| Elastic (Young's, Tensile) Modulus, GPa | 200 | |
| 210 |
| Elongation at Break, % | 11 | |
| 34 |
| Fatigue Strength, MPa | 390 | |
| 310 |
| Poisson's Ratio | 0.29 | |
| 0.29 |
| Reduction in Area, % | 17 | |
| 34 |
| Shear Modulus, GPa | 76 | |
| 81 |
| Shear Strength, MPa | 710 | |
| 570 |
| Tensile Strength: Ultimate (UTS), MPa | 1190 | |
| 850 |
| Tensile Strength: Yield (Proof), MPa | 800 | |
| 390 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 300 |
| Maximum Temperature: Mechanical, °C | 1000 | |
| 1100 |
| Melting Completion (Liquidus), °C | 1370 | |
| 1470 |
| Melting Onset (Solidus), °C | 1320 | |
| 1420 |
| Specific Heat Capacity, J/kg-K | 470 | |
| 450 |
| Thermal Expansion, µm/m-K | 13 | |
| 14 |
Otherwise Unclassified Properties
| Base Metal Price, % relative | 75 | |
| 80 |
| Density, g/cm3 | 8.3 | |
| 8.5 |
| Embodied Carbon, kg CO2/kg material | 10 | |
| 9.7 |
| Embodied Energy, MJ/kg | 140 | |
| 150 |
| Embodied Water, L/kg | 360 | |
| 300 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 120 | |
| 230 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 1610 | |
| 370 |
| Stiffness to Weight: Axial, points | 13 | |
| 14 |
| Stiffness to Weight: Bending, points | 23 | |
| 23 |
| Strength to Weight: Axial, points | 40 | |
| 28 |
| Strength to Weight: Bending, points | 30 | |
| 24 |
| Thermal Shock Resistance, points | 34 | |
| 21 |
Alloy Composition
| Aluminum (Al), % | 2.5 to 3.3 | |
| 0 |
| Boron (B), % | 0.0030 to 0.010 | |
| 0 |
| Carbon (C), % | 0 to 0.15 | |
| 0.080 to 0.16 |
| Chromium (Cr), % | 15 to 20 | |
| 20 to 22.5 |
| Cobalt (Co), % | 13 to 20 | |
| 18.5 to 21 |
| Copper (Cu), % | 0 to 0.15 | |
| 0 |
| Iron (Fe), % | 0 to 4.0 | |
| 24.3 to 36.2 |
| Manganese (Mn), % | 0 to 0.75 | |
| 1.0 to 2.0 |
| Molybdenum (Mo), % | 3.0 to 5.0 | |
| 2.5 to 3.5 |
| Nickel (Ni), % | 42.7 to 64 | |
| 19 to 21 |
| Niobium (Nb), % | 0 | |
| 0.75 to 1.3 |
| Nitrogen (N), % | 0 | |
| 0 to 0.2 |
| Phosphorus (P), % | 0 to 0.015 | |
| 0 to 0.040 |
| Silicon (Si), % | 0 to 0.75 | |
| 0 to 1.0 |
| Sulfur (S), % | 0 to 0.015 | |
| 0 to 0.030 |
| Tantalum (Ta), % | 0 | |
| 0.75 to 1.3 |
| Titanium (Ti), % | 2.5 to 3.3 | |
| 0 |
| Tungsten (W), % | 0 | |
| 2.0 to 3.0 |