ASTM B338 Grade 7 Titanium Pipe & Tube (UNS R52400)
ASTM B338 Gr 7 (UNS R52400) specifies seamless and welded titanium pipes and tubes made from commercially pure titanium alloyed with palladium for enhanced resistance to crevice corrosion and reducing acidic environments. Grade 7 is widely used in chemical processing and heat exchanger applications where superior corrosion resistance is required.
Key Features
- Palladium-stabilized titanium for exceptional corrosion resistance
- Excellent performance in reducing acids and chloride environments
- Superior resistance to crevice and pitting corrosion
- Good weldability and fabrication characteristics
- Lightweight with high strength-to-weight ratio
- Suitable for severe chemical and marine service conditions
Equivalent Grade
| Standard | Equivalent |
|---|---|
| UNS | R52400 |
| ASTM | Titanium Grade 7 |
| DIN | 3.7235 |
| ISO | Ti–Pd |
| JIS | TP340 |
ASTM B338 Gr 7 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 7 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 345 MPa |
| Yield Strength | ≥ 275 MPa |
| Elongation | ≥ 20% |
UNS R52400 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 7 Pipes
- Seamless Titanium Grade 7 Pipe
- Welded Titanium Grade 7 Pipe
- Heat Exchanger Tubes
- Condenser Tubes
- Process Piping Tubes
Applications
- Chemical processing plants
- Heat exchangers and condensers
- Sulfuric and hydrochloric acid service
- Marine and offshore piping systems
- Desalination plants
- Power generation equipment
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