1. Introduce
– A titanium alloy made by adding a small amount of the precious metal Pd to industrial pure titanium
– Metal resistant to crevice corrosion among titanium types
– Mechanical properties (yield strength, tensile strength, elongation) are similar to Ti Gr.2, but a small amount of Pd (Max. 0.2%) is added to provide excellent resistance to corrosion by acid
– Offers the same excellent properties as pure titanium grades while providing improved corrosion resistance
– Excellent heat resistance to temperatures up to 800°C
– UNS R52400
* UNS
- Abbreviation for Unified Numbering Systems for Metals and Alloys
- Unified unique numbering system for metals and alloys
- A representative number that is compatible with metals and alloys defined in many material-related codes such as ASTM, AISI, ASME, AWS, etc.
* R : Reactive and Refractory Metals and Alloys
* UNS R52400 : 5XXXX : Titanium
2. Property
– Crevice corrosion resistance, weldability, machinability, corrosion resistance, tensile strength, long service life, good resistance to high temperature and high pressure
| Element | Impact |
|---|---|
| Pd | Provides corrosion resistance of the alloy in oxidizing and reducing media, provides crevice corrosion resistance (Pd content less than 0.05% : corrosion rate increases, Pd content 0.1~0.2% : corrosion rate decreases) (Crevice corrosion does not occur when the service temperature reaches 250℃) |
[Ti Gr.7(Pd) Chemical Composition (%)]
| Ti | N | C | H |
|---|---|---|---|
| 98.75 ~ 99.88 | Max. 0.03 | Max. 0.10 | Max. 0.02 |
| Fe | O | Pd | Others |
|---|---|---|---|
| Max. 0.30 | Max. 0.25 | 0.12 ~ 0.25 | Max. 0.30 |
[Ti Gr.7(Pd) Mechanical Properties]
| Tensile Strength (Mpa) | Yield Strength (Mpa) | Elongation (%) | Hardness HV typical |
|---|---|---|---|
| Min. 345 | 275 ~ 450 | Min. 20 | 160 ~ 200 |
[Ti Gr.7(Pd) Physical Properties]
| Density (g/㎤) | Melting Range (℃) | Beta transus temperature (℃) | Specific Heat (0-100℃), J/kg*℃ |
|---|---|---|---|
| 4.50 | 1670 | 913 | 523 |
3. Standard & Specification
– Specification : UNS R52400
| Product Form | ASTM | SAE |
|---|---|---|
| Plate, Sheet, Strip | B265, F67, F136 | AMS 4911 |
| Bar, Rod | B248 | – |
| Wire | B863 | – |
| Tube | B338 | – |
| Forgings, Rings | B381 | – |
4. Available Form
– Bar, Rod, Billet
– Sheet, Plate, Strip
– Wire, Coil
– Forgings
– Castings
5. Application & Product
– Chemical
| Application | Product |
|---|---|
| Chemical | Heat exchangers, Pipelines, Cryogenic vessels, Storage tanks, Bolts, Fasteners |
(1) Heat Exchangers / (2) Storage Tanks / (3) Bolts
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