Quick Answer
What is Grade 7 titanium?
Grade 7 (Ti-0.15Pd) is a CP titanium grade with a small palladium addition (0.12–0.25%) that dramatically improves corrosion resistance in reducing acid environments. It offers the same mechanical properties as Grade 2 but with superior resistance to crevice corrosion in hot chloride solutions, making it the preferred material for chemical processing equipment handling aggressive media.
Chemical Composition
| Element |
Weight % |
| Titanium (Ti) |
balance |
| Palladium (Pd) |
0.12–0.25 |
| Iron (Fe) |
≤ 0.30 |
| Oxygen (O) |
≤ 0.25 |
| Carbon (C) |
≤ 0.08 |
Mechanical Properties
| Property |
Value |
| Density |
4.51 g/cm³ |
| Tensile Strength |
345 MPa (min) |
| Yield Strength |
275 MPa (min) |
| Elongation |
20% |
| Hardness |
24 HRC |
Applications
- Chemical Processing: Heat exchangers in HCl service, reaction vessels, piping for reducing acids, column internals
- Oil & Gas: Sour gas service components, produced water handling equipment
- Marine: Seawater heat exchangers, desalination plant components
- Energy: Geothermal well casings, flue gas desulfurisation scrubbers
