Type 4 Magnetic Alloy vs. R30021 Cobalt
Type 4 magnetic alloy belongs to the nickel alloys classification, while R30021 cobalt belongs to the cobalt 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 Type 4 magnetic alloy and the bottom bar is R30021 cobalt.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 190 | |
| 220 |
| Elongation at Break, % | 2.0 to 40 | |
| 9.0 |
| Fatigue Strength, MPa | 220 to 400 | |
| 250 |
| Poisson's Ratio | 0.31 | |
| 0.29 |
| Shear Modulus, GPa | 73 | |
| 86 |
| Tensile Strength: Ultimate (UTS), MPa | 620 to 1100 | |
| 700 |
| Tensile Strength: Yield (Proof), MPa | 270 to 1040 | |
| 500 |
Thermal Properties
| Latent Heat of Fusion, J/g | 290 | |
| 330 |
| Melting Completion (Liquidus), °C | 1420 | |
| 1350 |
| Melting Onset (Solidus), °C | 1370 | |
| 1190 |
| Specific Heat Capacity, J/kg-K | 440 | |
| 450 |
| Thermal Expansion, µm/m-K | 11 | |
| 11 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.9 | |
| 1.9 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 3.0 | |
| 2.1 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.8 | |
| 8.4 |
| Embodied Carbon, kg CO2/kg material | 10 | |
| 8.0 |
| Embodied Energy, MJ/kg | 140 | |
| 110 |
| Embodied Water, L/kg | 210 | |
| 520 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 22 to 200 | |
| 57 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 190 to 2840 | |
| 570 |
| Stiffness to Weight: Axial, points | 12 | |
| 15 |
| Stiffness to Weight: Bending, points | 22 | |
| 24 |
| Strength to Weight: Axial, points | 19 to 35 | |
| 23 |
| Strength to Weight: Bending, points | 18 to 27 | |
| 21 |
| Thermal Shock Resistance, points | 21 to 37 | |
| 21 |
Alloy Composition
| Carbon (C), % | 0 to 0.050 | |
| 0.2 to 0.35 |
| Chromium (Cr), % | 0 to 0.3 | |
| 26 to 29 |
| Cobalt (Co), % | 0 to 0.5 | |
| 61.7 to 67.3 |
| Copper (Cu), % | 0 to 0.3 | |
| 0 |
| Iron (Fe), % | 9.5 to 17.5 | |
| 0 to 3.0 |
| Manganese (Mn), % | 0 to 0.8 | |
| 0 |
| Molybdenum (Mo), % | 3.5 to 6.0 | |
| 4.5 to 6.0 |
| Nickel (Ni), % | 79 to 82 | |
| 2.0 to 3.0 |
| Phosphorus (P), % | 0 to 0.010 | |
| 0 |
| Silicon (Si), % | 0 to 0.5 | |
| 0 to 1.5 |
| Sulfur (S), % | 0 to 0.020 | |
| 0 |