ASTM B338 Grade 11 Titanium Pipe & Tube (UNS R52250)
ASTM B338 Grade 11 (UNS R52250) covers seamless and welded titanium pipes and tubes manufactured from a titanium–palladium alloy, combining the corrosion resistance of commercially pure titanium with enhanced strength and improved resistance to crevice corrosion. Grade 11 is widely used in chemical processing, heat exchangers, and marine environments where durability and corrosion resistance are critical.
Key Features
- Titanium–palladium alloy with superior corrosion resistance
- Enhanced resistance to crevice and pitting corrosion
- Better strength compared to Grade 1 and Grade 2
- Excellent weldability and fabrication characteristics
- Lightweight with high strength-to-weight ratio
- Suitable for aggressive chemical and marine environments
Equivalent Grade
| Standard | Equivalent |
|---|---|
| UNS | R52250 |
| ASTM | Titanium Grade 11 |
| DIN | 3.7235 |
| ISO | Ti–Pd |
| JIS | TP340 |
ASTM B338 Gr 11 Chemical Composition
| Element | Composition (%) |
|---|---|
| Titanium (Ti) | Balance |
| Palladium (Pd) | 0.12 – 0.25 |
| Iron (Fe) | ≤ 0.30 |
| Oxygen (O) | ≤ 0.25 |
| Carbon (C) | ≤ 0.08 |
| Nitrogen (N) | ≤ 0.03 |
| Hydrogen (H) | ≤ 0.015 |
Gr 11 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 345 MPa |
| Yield Strength | ≥ 275 MPa |
| Elongation | ≥ 20% |
UNS R52250 Physical Properties
| Property | Value |
|---|---|
| Density | 4.51 g/cm³ |
| Melting Point | 1668°C |
| Thermal Conductivity | 16.4 W/m·K |
| Modulus of Elasticity | 105 GPa |
| Electrical Resistivity | 42 µΩ·cm |
Type of ASTM B338 Gr 11 Pipes
- Seamless Titanium Grade 11 Pipe
- Welded Titanium Grade 11 Pipe
- Heat Exchanger Tubes
- Condenser Tubes
- Process Piping Tubes
Applications
- Chemical processing equipment
- Heat exchangers and condensers
- Marine and offshore piping systems
- Desalination plants
- Power generation systems
- Acid handling and process industries
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