Titanium Grade 7
UNS R52400
Description
Titanium Grade 7 is an titanium alloy made by adding 0.12 to 0.25% of the precious metal palladium to commercial pure Titanium Grade 2. Thus, it has similar physical and mechanical properties to Titanium Grade 2. However, due to the addition of palladium, Titanium Grade 7 offers improved corrosion resistance to general and localized crevice corrosion in a wide range of reducing acid environments, including chloride-containing media, and where low pH and high temperatures are prevalent. It is even the most corrosion resistance of all titanium alloys. In addition, it has excellent welding and fabrication. Excellent corrosion resistance makes it widely used in chemical industry, especially in petrochemical industry.
Chemical Component
| Ti | Fe | O | C | N | H | Pd | Others |
|---|---|---|---|---|---|---|---|
| Balance | 0.30% max | 0.25% max | 0.10% max | 0.03% max | 0.015% max | 0.12-0.25% | 0.4% max (total) |
Basic Information
| Items | Titanium Grade 7 |
|---|---|
| Catalog | ACAM-Ti-P005 |
| Density | 0.163 lb/in3 (4.51 g/cm3) |
| Modulus of Elasticity | At 70 °F (20 °C): 16.3 x 103 ksi (112 GPa) |
| Modulus of Rigidity | At 70 °F (20 °C): 5.9 x 103 ksi (41 GPa) |
| Coefficient of Expansion | 5.4 µin/in.-°F (70 °F to 932 °F); 9.7 µm/m-°C (20 °C to 500 °C) |
| Electrical Resistivity | 21 µΩ.in (53.3 µΩ.cm) |
| Thermal Conductivity | 12.6 Btu-in/ft2hr-°F (21.79 W/m-K) |
| Melting Point | 1670 °C |
Material Forms
Alfa Chemistry offers Titanium Grade 7 in a variety of forms, including Bar, Billet, Extrusion, Plate, Sheet, Strip, Wire, Forging Stock, Pipe and Tube.
Typical Mechanical Properties
- As per MIL-T-9046J, AMS-T-9046, AMS 4901
| Material | Tensile Strength | Yield Strength | Elongation |
|---|---|---|---|
| Annealed Sheet | 50 ksi (345 Mpa) | 40-65ksi (275-450 Mpa) | 20% |
Additional Properties
Forming: May be hot or cold formed using hydropress, power brake, stretch or drop hammer methods. Similar in characteristics to 300 series stainless steels.
Welding: Rated as "good" in terms of weldability.
Hot Working: Hot forming will reduce both the springback and required forming forces, and will increase the overall ductility of the material.
Cold Working: The cold work characteristics of this material is similar to that of a moderately tempered austenitic stainless steel. In multiple cold forming operations, intermediate stress relief is recommended to prevent tearing or other material damage. Post-work annealing is required to reattain optimum performance characteristics.
Specifications
- ASTM B265 Gr7 Sheet/plate
- ASTM B337 Gr7 pipe (withdrawn)
- ASTM B338 Gr7 heat exchange tube
- ASTM B348 Gr7 bar
- ASTM B367 Gr7 castings
- ASTM B381 Gr7 forgings
- ASTM F467 Gr7 nuts
- ASTM F468 Gr7 bolts
Applications
Titanium Grade 7 is generally found in chemical process and production equipment components. Typical applications include:
- Anode/cathode/cell components
- Chemical processing equipment
- Air pollution control equipment
- Pulp/paper bleaching/washing equipment
- Hydrometallurgical extraction/electrowinning
- Desalination, brine concentration/evaporation
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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