R31538 Cobalt vs. Type 4 Magnetic Alloy
R31538 cobalt belongs to the cobalt alloys classification, while Type 4 magnetic alloy belongs to the nickel alloys. There are 25 material properties with values for both materials. Properties with values for just one material (8, in this case) are not shown.
For each property being compared, the top bar is R31538 cobalt and the bottom bar is Type 4 magnetic alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 190 |
| Elongation at Break, % | 13 to 23 | |
| 2.0 to 40 |
| Fatigue Strength, MPa | 310 to 480 | |
| 220 to 400 |
| Poisson's Ratio | 0.29 | |
| 0.31 |
| Shear Modulus, GPa | 86 | |
| 73 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 620 to 1100 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 270 to 1040 |
Thermal Properties
| Latent Heat of Fusion, J/g | 320 | |
| 290 |
| Melting Completion (Liquidus), °C | 1360 | |
| 1420 |
| Melting Onset (Solidus), °C | 1290 | |
| 1370 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 440 |
| Thermal Expansion, µm/m-K | 13 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 2.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 3.0 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.8 |
| Embodied Carbon, kg CO2/kg material | 8.1 | |
| 10 |
| Embodied Energy, MJ/kg | 110 | |
| 140 |
| Embodied Water, L/kg | 530 | |
| 210 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 22 to 200 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 190 to 2840 |
| Stiffness to Weight: Axial, points | 15 | |
| 12 |
| Stiffness to Weight: Bending, points | 24 | |
| 22 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 19 to 35 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 18 to 27 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 21 to 37 |
Alloy Composition
| Carbon (C), % | 0.15 to 0.35 | |
| 0 to 0.050 |
| Chromium (Cr), % | 26 to 30 | |
| 0 to 0.3 |
| Cobalt (Co), % | 58.7 to 68.9 | |
| 0 to 0.5 |
| Copper (Cu), % | 0 | |
| 0 to 0.3 |
| Iron (Fe), % | 0 to 0.75 | |
| 9.5 to 17.5 |
| Manganese (Mn), % | 0 to 1.0 | |
| 0 to 0.8 |
| Molybdenum (Mo), % | 5.0 to 7.0 | |
| 3.5 to 6.0 |
| Nickel (Ni), % | 0 to 1.0 | |
| 79 to 82 |
| Nitrogen (N), % | 0 to 0.25 | |
| 0 |
| Phosphorus (P), % | 0 | |
| 0 to 0.010 |
| Silicon (Si), % | 0 to 1.0 | |
| 0 to 0.5 |
| Sulfur (S), % | 0 | |
| 0 to 0.020 |