Meta description: Grade 9 titanium (Ti-3Al-2.5V) pairs light weight, formability and corrosion resistance — the top choice for seamless, thin-wall tubing. Properties, uses and sourcing tips.
Buyers who need thin-wall tubing that bends, coils and welds without cracking — yet still carries real strength and shrugs off corrosion — face a familiar headache: Grade 5 titanium is strong but hard to form, and Grade 2 forms easily but lacks strength. Grade 9 titanium, the near-alpha alloy Ti-3Al-2.5V, sits in the sweet spot. That is why it has become the default grade for aerospace hydraulic lines, bicycle frames and marine piping.
What is Grade 9 titanium (Ti-3Al-2.5V)?
Grade 9 is a low-alloy titanium grade with 3% aluminium and 2.5% vanadium. The small alloy addition lifts strength well above commercially pure (CP) titanium while keeping the alloy cold-workable — a combination CP grades and the high-strength Grade 5 cannot both offer. It is specified under ASTM B338 (tube), B348 (bar), B265 (sheet) and AMS 4943, among others.
Key properties that make it ideal for tubing
| La force ultime | Limite d'élasticité | Elongation 2" | |||
|---|---|---|---|---|---|
| ksi | Mpa | ksi | Mpa | % | |
| Recuit | 90 | 621 | 70 | 485 | 15 |
| CWSR | 125 | 862 | 105 | 724 | 10 |
Where Grade 9 tubing is used
Because it bends and welds so well, tube en titane in Grade 9 shows up wherever weight, corrosion and tight bends matter:
- Aerospace hydraulic & pneumatic lines — thin-wall, light, fatigue-resistant.
- Bicycle & e-bike frames — cold-bent and brazed into lightweight, compliant frames.
- Marine & offshore piping — resists seawater crevice and pitting corrosion.
- Heat exchangers & condensers — thinner walls improve heat transfer.
- Medical & sporting tubing — biocompatible and easy to shape.
Grade 9 vs Grade 2 vs Grade 5 for tubing
| Factor | Grade 2 (CP Ti) | Grade 9 (Ti-3Al-2.5V) | Grade 5 (Ti-6Al-4V) |
| UTS (typical) | ~345 MPa | ~620 MPa | ~895–950 MPa |
| Formability | Excellent | Excellent | Modéré |
| Weldability | Excellent | Bon | Good (more care) |
| Best tubing use | Low-pressure corrosive service | Bent/thin-wall, strength needed | High-load, thick-wall parts |
| Relative cost | Lower | Mid | Higher |
When your tube must be bent, coiled or welded and still carry meaningful pressure, Grade 5 is usually overkill and harder to work; Grade 2 may be too weak. Grade 9 is the balanced pick.
Sourcing Grade 9 from a China trading partner
As a China-based titanium trading company, we help you specify the right temper, standard and NDE level, then back it with documentation:
- QC — Positive Material Identification (PMI), UT/PT where required, and dimensional checks.
- Certifications — EN 10204 3.1 mill test report with every batch .
- Flexible MOQ — consolidate Grade 9 tube with bar, plate or fittings to lower minimums.
- Transparent lead time — committed schedule based on stock / rolling / made-to-order.
👉 Request a quote or get the Grade 9 selection sheet → FDtitanium.com
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