R31538 Cobalt vs. K94200 Alloy
R31538 cobalt belongs to the cobalt alloys classification, while K94200 alloy belongs to the iron alloys. There are 21 material properties with values for both materials. Properties with values for just one material (10, in this case) are not shown.
For each property being compared, the top bar is R31538 cobalt and the bottom bar is K94200 alloy.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 220 | |
| 140 |
| Elongation at Break, % | 13 to 23 | |
| 5.0 to 32 |
| Poisson's Ratio | 0.29 | |
| 0.34 |
| Shear Modulus, GPa | 86 | |
| 54 |
| Tensile Strength: Ultimate (UTS), MPa | 1020 to 1360 | |
| 500 to 710 |
| Tensile Strength: Yield (Proof), MPa | 580 to 930 | |
| 270 to 650 |
Thermal Properties
| Melting Onset (Solidus), °C | 1290 | |
| 1440 |
| Specific Heat Capacity, J/kg-K | 450 | |
| 500 |
| Thermal Conductivity, W/m-K | 13 | |
| 15 |
| Thermal Expansion, µm/m-K | 13 | |
| 5.0 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 2.0 | |
| 2.7 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 2.1 | |
| 3.0 |
Otherwise Unclassified Properties
| Density, g/cm3 | 8.4 | |
| 8.2 |
Common Calculations
| Resilience: Ultimate (Unit Rupture Work), MJ/m3 | 140 to 200 | |
| 35 to 130 |
| Resilience: Unit (Modulus of Resilience), kJ/m3 | 750 to 1920 | |
| 250 to 1460 |
| Stiffness to Weight: Axial, points | 15 | |
| 9.8 |
| Stiffness to Weight: Bending, points | 24 | |
| 21 |
| Strength to Weight: Axial, points | 34 to 45 | |
| 17 to 24 |
| Strength to Weight: Bending, points | 27 to 32 | |
| 17 to 22 |
| Thermal Diffusivity, mm2/s | 3.5 | |
| 3.7 |
| Thermal Shock Resistance, points | 25 to 33 | |
| 49 to 70 |