ASTM B338 Gr.7 Titanium Tube for Heat Exchanger Condenser
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ASTM B338 Gr.7 (UNS R52400) Seamless and Welded Titanium Tube For Heat Exchanger and Condenser
ASTM B338 Gr.7 (UNS R52400) seamless and welded titanium tubes are palladium-enhanced alpha titanium alloy tubes specifically designed for heat exchangers and condensers in highly corrosive environments. These tubes combine the inherent corrosion resistance of commercially pure titanium (Grade 2) with 0.12-0.25% palladium addition, significantly improving resistance to reducing acids (e.g., hydrochloric/sulfuric acid) and localized corrosion. Available in both seamless (cold-worked) and welded forms, they exhibit minimum yield strength of 275 MPa (40 ksi) and exceptional thermal conductivity, making them ideal for shell-and-tube heat exchangers, seawater cooling systems, and chemical processing equipment where stainless steels or copper alloys fail prematurely.
1.Chemical & Mechanical Properties
| ASTM B338 Gr.7 Chemical Composition (%) |
||||||
| C | Fe | Ti | H | Pd | O | N |
| ≤0.08% | ≤0.3% | BAL | ≤0.015% | 0.12-0.25% | ≤0.25% | ≤0.03% |
Mechanical Properties
| Property | Standard Value (Annealed) |
| Tensile Strength | ≥ 345 MPa (50 ksi) |
| Yield Strength | ≥ 275 MPa (40 ksi) |
| Elongation | ≥ 20% (in 4D for seamless tubes) ≥ 15% (in 4D for welded tubes) |
| Hardness (Brinell) | ≤ 200 HV (Vickers) ≤ 90 HRB (Rockwell B) |
| Bend Test | No cracks after bending around a mandrel |
| Hydrostatic Test | (No leakage) under specified pressure |
2. Key Adventages
Material Properties
- Excellent Corrosion Resistance: Especially resistant to chlorides, acidic/alkaline media (e.g., seawater, chemical fluids).
- Ti-0.2Pd Alloy (Grade 7): Palladium addition enhances resistance in reducing environments.
Mechanical Performance
- High Strength & Lightweight: Tensile strength ≥ 345 MPa, yield strength ≥ 275 MPa, density only 60% of steel.
- Good Ductility: Elongation ≥ 20% (seamless) / ≥ 15% (welded) in 4D gauge length.
Thermal Performance
- High Thermal Conductivity: Ideal for heat transfer applications in exchangers/condensers.
- Heat Resistance: Stable operation up to 300°C (depends on environment).
Product Forms
- Seamless Tubes: No weld seams, higher pressure resistance for critical applications.
- Welded Tubes: Cost-effective, reliability verified by bend tests.
3. Key Applications
- Oil & Gas: Refinery hydrogenation units / LNG heat exchangers / Pipeline heating systems
- Chemical Industry: Chlor-alkali equipment / Pickling line heat exchangers / PTA production units
- Power Generation: Nuclear plant condensers / FGD systems in coal plants / Geothermal heat exchangers
- Marine Engineering: Desalination plants / Offshore platform cooling systems / Naval vessel heat exchangers
- Aerospace: Aircraft engine oil coolers / ECLSS (Environmental Control Systems)
- Environmental: Flue gas scrubbers / Wastewater evaporators / Hazardous waste pyrolysis units
| Category | Gr.7 (Ti-0.2Pd) | Gr.1 | Gr.2 | Gr.5 (Ti-6Al-4V) | Gr.9 (Ti-3Al-2.5V) |
|---|---|---|---|---|---|
| UNS Number | R52400 | R50250 | R50400 | R56400 | R56320 |
| Main Composition | Ti-0.2Pd Alloy | Pure Ti (Low O) | Pure Ti (Standard) | Ti-6Al-4V Alloy | Ti-3Al-2.5V Alloy |
| Tensile Strength (MPa) | 345-483 | 240-310 | 345-483 | 895-1034 | 483-620 |
| Yield Strength (MPa) | 275-380 | 170-240 | 275-380 | 828-897 | 345-550 |
| Elongation (%) | ≥20 | ≥24 | ≥20 | ≥10 | ≥15 |
| Corrosion Resistance | Best for HCl/H₂SO₄ | Good for seawater/weak acids | General corrosion resistance | Resists chlorides (weak welds) | Good seawater resistance |
| Typical Applications | Strong acids, nuclear plants | Chemical linings | Desalination, heat exchangers | Aerospace, pressure vessels | Ship piping |
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