Titanium Alloys
Titanium Grade 7 (UNS R52400) — Composition, Properties & Supply
Titanium Grade 7 (UNS R52400, equivalent to TA9) is Grade 2 with 0.12–0.25% palladium. The palladium markedly improves resistance to reducing acids and hot chlorides, giving crevice corrosion resistance far better than Grade 2.
What is the chemical composition of Titanium Grade 7?
| Element | Symbol | Content (wt%) |
|---|---|---|
| Ti | Ti | Balance |
| Pd | Pd | 0.12–0.25 |
| Fe | Fe | ≤ 0.30 |
| O | O | ≤ 0.25 |
| C | C | ≤ 0.08 |
| N | N | ≤ 0.03 |
Values are typical specification limits. Actual heat analysis is reported on the EN 10204 3.1 mill test certificate supplied with each shipment.
What are the mechanical properties of Titanium Grade 7?
| Property | Value | Note |
|---|---|---|
| Tensile strength | ≥ 345 MPa | Room temperature |
| Yield strength (0.2% offset) | ≥ 275 MPa | Room temperature |
| Elongation | ≥ 20 % | Gauge length 50 mm / 4D |
| Hardness | ≤ 160 HB | Brinell / Rockwell |
What are the physical properties of Titanium Grade 7?
| Property | Value |
|---|---|
| Density | 4.51 g/cm³ |
| Melting range | 1660–1675 °C |
| Thermal conductivity | 16.0 W/m·K |
| Elastic modulus | 103 GPa |
| Maximum service temperature | 425 °C |
What are the key characteristics of Titanium Grade 7?
- Palladium alloying greatly improves reducing-acid resistance
- Far better hot-chloride crevice corrosion resistance than Grade 2
- Retains Grade 2 formability and weldability
- Suits dilute hydrochloric, sulphuric and phosphoric acid
Where is Titanium Grade 7 used?
- Dilute HCl and sulphuric acid chemical plant
- High-temperature brine and seawater heat exchangers
- Hydrometallurgy and electrolytic cells
- Pulp bleaching equipment
- Critical FGD components
Which standards and specifications cover Titanium Grade 7?
What product forms are available?
Frequently asked questions
Is the extra cost of Grade 7 over Grade 2 justified?
In crevices, hot chlorides or reducing acids, Grade 7 often lasts several times longer than Grade 2, and downtime plus replacement cost far exceeds the material premium. For clean oxidising media or seawater, Grade 2 is sufficient and the palladium cost is unnecessary.
Need Titanium Grade 7 bar, tube, plate or forgings?
Send the grade, dimensions, standard and quantity. We answer within 10 minutes on working days and quote within 24 hours, with EN 10204 3.1 certification.
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