This alloy has mechanical properties similar to Grade 2 but has improved resistance to general and localized crevice corrosion in a wide range of reducing acid environments including chlorides, with a good balance of moderate strength, reasonable ductility and excellent weldability.
Grade 16 is identical to Grade 7 with the exception of less palladium to increase its corrosion resistance. Mechanical and physical properties, specifications and forms are all identical to those of Grade 7.
The alloy composition differs by the reduction of Pd to 0.04-0.08%
This alloy has mechanical properties similar to Grade 1 but has improved resistance to general and localized crevice corrosion in a wide range of reducing acid environments including chlorides, with a good balance of moderate strength, reasonable ductility and excellent weldability.
Composition
Physical Data
Mechanical Data
Fabrication Information
| C | < 0.1 % |
| Fe | < 0.3 % |
| N2 | < 0.03 % |
| Pd | 0.12-0.25% |
| O2 | < 0.25% |
| H2 (sheet) | < 0.015 % |
| H2 (bar) | < 0.0125 % |
| Ti = | Rem |
| Minimum | Typical | |
| Density g/cm3 (lb/cu.in) | 4.51(0.162) | |
| Melting Range °C+/-15°C (°F) | 1677(3051) | |
| Specific Heat J/g/°C | 0.54 | |
| Volume Electrical Resistivity 1µohm.cm (1µohm.in) | 56(22) | |
| Thermal Conductivity W/mK(Btu/ft h°F) | 20.6 (143) | |
| *Mean Thermal Exp. Coeff. 0-100°C/°C | 8.6 x 10 -6 | |
| *Mean Thermal Exp. Coeff. 0-300°C/°C | 9.2 x 10 -6 | |
| Beta Transus °C+/-15°C(°F) | 913 (1675) |
| Minimum | Typical | |
| Tensile Strength MPa(ksi) | 345 (50) | 483 (70) |
| 0.2% Proof Stress MPa(ksi) | 276 (40) | 352 (51) |
| Elongation over 2 Inches % | 20 | 28 |
| Elastic Modulus GPa(Msi) | 103 (15) | |
| Hardness Bhn | 160 | |
| Specified Bend Radius <0.070" x Thickness | 2 | |
| Specified Bend Radius >0.070In x Thickness | 2.5 | |
| Welded Bend Radius x Thickness | 3 | |
| Charpy, V-Notch Impact J(ft Ibf) | 41 (30) |
| Weldability | Excellent |
| Forging | Rough 900°C (1650°F), finish 843°C (1550°F) |
| Annealing | 704°C (1300°F), 2 hr, AC |
| Stress Relief Annealing | 482-538°C (900-1000°F), 45 min. |