Hard Drawn ASTM B596 vs. Work Hardened 85-platinum 15-iridium
Both hard drawn ASTM B596 and work hardened 85-platinum 15-iridium are otherwise unclassified metals. Both are furnished in the cold worked (strain hardened) condition.
For each property being compared, the top bar is hard drawn ASTM B596 and the bottom bar is work hardened 85-platinum 15-iridium.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 100 | |
| 220 |
| Elongation at Break, % | 4.3 | |
| 5.5 |
| Poisson's Ratio | 0.41 | |
| 0.38 |
| Shear Modulus, GPa | 36 | |
| 81 |
| Shear Strength, MPa | 360 | |
| 420 |
| Tensile Strength: Ultimate (UTS), MPa | 620 | |
| 730 |
Thermal Properties
| Latent Heat of Fusion, J/g | 77 | |
| 110 |
| Melting Completion (Liquidus), °C | 1060 | |
| 1820 |
| Melting Onset (Solidus), °C | 930 | |
| 1790 |
| Specific Heat Capacity, J/kg-K | 150 | |
| 130 |
| Thermal Expansion, µm/m-K | 14 | |
| 8.4 |
Electrical Properties
| Electrical Conductivity: Equal Volume, % IACS | 14 | |
| 6.2 |
| Electrical Conductivity: Equal Weight (Specific), % IACS | 6.7 | |
| 2.6 |
Otherwise Unclassified Properties
| Density, g/cm3 | 18 | |
| 22 |
Common Calculations
| Stiffness to Weight: Axial, points | 3.1 | |
| 5.7 |
| Stiffness to Weight: Bending, points | 8.5 | |
| 9.3 |
| Strength to Weight: Axial, points | 9.4 | |
| 9.3 |
| Strength to Weight: Bending, points | 8.8 | |
| 8.3 |
| Thermal Shock Resistance, points | 30 | |
| 28 |
Alloy Composition
| Copper (Cu), % | 9.0 to 11 | |
| 0 |
| Gold (Au), % | 89 to 91 | |
| 0 |
| Iridium (Ir), % | 0 | |
| 14.5 to 15.5 |
| Platinum (Pt), % | 0 | |
| 84.3 to 85.5 |
| Residuals, % | 0 | |
| 0 to 0.2 |