Titanium Pipe Fabrication and Bending Procedures: Complete Technical Guide 2026
Titanium pipe is increasingly specified in chemical processing, offshore, aerospace, and medical applications for its exceptional strength-to-weight ratio and corrosion resistance. However, fabricating and bending titanium requires fundamentally different procedures from steel or stainless steel. This guide covers all aspects of titanium pipe fabrication and bending to ensure successful outcomes.
Why Titanium Is Different
Titanium has properties that significantly affect fabrication:
- High springback: Elastic recovery is 2-3× that of steel — requires overbending
- Galling tendency: Titanium has strong adhesive wear characteristics — requires special tooling lubrication
- Oxygen/nitrogen absorption: At temperatures above 500°C, titanium readily absorbs atmospheric gases → embrittlement → requires inert gas shielding for hot work
- Low thermal conductivity: Heat doesn’t dissipate quickly → local hot spots during welding → requires careful heat management
- Reactive at high temperatures: Above 600°C, titanium reacts with carbon, oxygen, nitrogen → contamination prevention is critical
Titanium Pipe Grades for Fabrication
| Grade | Type | Yield Strength (MPa) | Fabricability | Common Applications |
|---|---|---|---|---|
| Grade 1 | CP (Commercially Pure) | 170 | Excellent — most formable | Chemical processing, desalination |
| Grade 2 | CP | 275 | Very good | General corrosion service, heat exchangers |
| Grade 5 (Ti-6Al-4V) | Alpha-Beta alloy | 830 | Good — requires hot forming for tight radii | Aerospace, offshore, high-strength |
| Grade 7 | CP + Pd | 275 | Very good | Chemical processing (crevice corrosion resistance) |
| Grade 12 (Ti-0.3Mo-0.8Ni) | Near-alpha alloy | 345 | Good | Chemical processing, power generation |
Cold Bending Procedures
When to Cold Bend
- Grade 1 and Grade 2: Can be cold bent to relatively tight radii
- Bend ratio ≥ 5D (bend radius ≥ 5× pipe OD) for CP grades
- Bend ratio ≥ 8-10D for Grade 5
- Ambient temperature bending with proper tooling
Cold Bending Methods
| Method | Bend Radius | Grade Suitability | Key Considerations |
|---|---|---|---|
| Rotary draw bending | ≥ 2.5D (CP), ≥ 5D (Grade 5) | All grades | Best surface finish; requires mandrel for thin wall |
| Roll bending | Large radii (≥ 10D) | All grades | Good for large-diameter, gentle bends |
| Compression bending | ≥ 3D | Grade 1, 2 | Simpler tooling; less precise than draw bending |
| Press bending | ≥ 5D | All grades | For field bending; requires careful control |
Springback Compensation
Titanium’s springback is significant:
| Grade | Typical Springback Angle | Compensation Method |
|---|---|---|
| Grade 1 | 3-5° | Overbend by 3-5° |
| Grade 2 | 5-8° | Overbend by 5-8° |
| Grade 5 | 8-12° | Overbend by 8-12° or use bottoming technique |
Springback also varies with:
- Wall thickness (thicker wall = more springback)
- Bend radius (tighter radius = more springback)
- Bend angle (larger angle = more total springback)
Hot Bending Procedures
When Hot Bending Is Required
- Grade 5 (Ti-6Al-4V): For bend radii < 5D
- Any grade: For very tight radii or complex multi-plane bends
- When cold bending causes cracking or excessive springback
Hot Bending Temperature Ranges
| Grade | Hot Forming Temperature (°C) | Inert Gas Shield Required |
|---|---|---|
| Grade 1, 2 | 480-590°C | Above 500°C — argon shield recommended |
| Grade 5 | 650-790°C | Mandatory above 600°C — full argon enclosure |
| Grade 12 | 590-700°C | Recommended above 500°C |
Induction Bending
Induction bending is the preferred hot bending method for titanium pipe:
- Local heating by induction coil to the target temperature
- Pipe is slowly pushed through the coil while being bent around a fixed die
- Argon gas shielding must cover the heated zone AND the cooling zone until temperature drops below 400°C
- Trailing argon shield is essential — hot titanium behind the bend also absorbs gases
Hot Bending Precautions
- Never exceed the maximum forming temperature — Grain growth and alpha case formation
- Maintain full inert atmosphere — Straw/blue/tinted color indicates acceptable; white/silver is best; gray/white powder = contamination = reject
- Use titanium-compatible tooling — Steel tooling can cause galvanic contamination at high temperatures
- Control cooling rate — Air cool naturally; do not water quench (can cause distortion and residual stress)
Contamination Prevention
Color Code for Titanium Surface Condition After Heating
| Color | Condition | Action |
|---|---|---|
| Bright silver/straw | Excellent — minimal pickup | Accept as-is |
| Light gold/blue | Acceptable — minor oxide | Accept for most applications |
| Dark blue/purple | Moderate contamination | Pickle or grit blast; re-examine |
| Gray/chalky white | Severe contamination | REJECT — remove affected area or entire piece |
Tooling and Lubrication Requirements
- Tooling material: Use hardened steel, bronze, or titanium-compatible alloys
- Lubricants: Use titanium-specific lubricants (chlorine-free, sulfur-free); never use standard steel-working lubricants
- Cleanliness: All tooling must be free of iron, steel particles, or carbon contamination
- Gloves: Wear clean gloves when handling titanium — fingerprints contain salts that can cause pitting during subsequent heating
Post-Bend Heat Treatment
Depending on the grade and service requirements:
- Grade 1, 2 (CP): Stress relief at 480-595°C for 15-60 minutes may be required for critical services
- Grade 5: May require solution anneal + aging to restore full properties after hot bending
- All grades: Post-bend inspection for cracks, ovality, and wall thinning is mandatory
Quality Inspection After Bending
- Visual examination: Check for surface cracks, galling marks, and contamination colors
- Ovality measurement: Must comply with ASTM B861 (typically ≤8% for most applications)
- Wall thickness: Verify minimum wall at the outside of the bend (extrados)
- Non-destructive testing: PT (dye penetrant) for surface cracks; UT for wall thickness verification
- Dimensional check: Bend angle, bend radius, and tangent lengths
Sourcing Titanium Pipe
When procuring titanium pipe for fabrication:
- Specify grade, condition (annealed vs stress-relieved), and ASTM standard (B861 for seamless, B338 for welded)
- Request actual chemical analysis and mechanical test results
- Verify the mill has experience with your required grade
- Consider ordering extra length to account for bend allowances and end trimming
CoreMetal Steel supplies titanium pipe and tube in Grades 1, 2, 5, 7, and 12 per ASTM B861 and B338, in both seamless and welded configurations, with full material traceability.
Conclusion
Titanium pipe fabrication and bending require specialized knowledge, tooling, and procedures that differ fundamentally from steel. The key success factors are: proper springback compensation, contamination prevention through inert gas shielding, titanium-compatible lubricants, and thorough post-bend inspection. Whether you’re fabricating heat exchanger coils for chemical plants or subsea piping for offshore platforms, following these procedures ensures reliable, high-quality results.