Titanium Grade 9 Tube for Aerospace Hydraulic Lines
When an aircraft hydraulic line fails, there is no pull-over to the shoulder. The tubing has to be light enough not to penalize payload, strong enough to hold high pressure for decades, and corrosion-proof against everything from salt-laden coastal air to hydraulic fluid itself. For many airframers and MRO buyers, 9e année tube en titane (Ti-3Al-2.5V) is the quiet workhorse that meets all three at once.
What Is Grade 9 Titanium (Ti-3Al-2.5V)?
Grade 9 — UNS R56320 — is a near-alpha titanium alloy with roughly 3% aluminium and 2.5% vanadium. It sits in a sweet spot: about 20–50% stronger than commercially pure (CP) Grade 2, yet far easier to cold-form and weld than the high-strength Grade 5 (Ti-6Al-4V). That combination is exactly what hydraulic and pneumatic tubing need. For a deeper look at the alloy itself, see our Grade 9 titanium property guide.
Typical Specifications for Grade 9 Hydraulic Tubing
The values below are typical reference ranges for aerospace-grade Ti-3Al-2.5V tubing. Always confirm against the ordered specification and the supplied mill test report.
| Property / Item | Typical Value | Note |
|---|---|---|
| UNS / Grade | R56320 / Grade 9 | Ti-3Al-2,5V |
| Density | 4.48 g/cm³ | ~60% of steel’s weight |
| Tensile strength (min) | 620 MPa (90 ksi) | Reference, annealed |
| Yield strength (min) | 483 MPa (70 ksi) | Reference, annealed |
| Elongation (min) | ≥ 15% | Good ductility |
| Common standards | ASTM B861, B338; AMS 4943 / 4944 | Seamless & hydraulic tubing specs |
| Typical sizes | OD 3–50 mm; wall 0.5–3 mm | Custom per drawing |
| Surface / test | Pickled or bright annealed; eddy-current tested | 100% ET on seamless tube |
Grade 9 vs Grade 2 vs Grade 5 for Hydraulic Lines
| Factor | Grade 2 (CP Ti) | Grade 9 (Ti-3Al-2.5V) | Grade 5 (Ti-6Al-4V) |
|---|---|---|---|
| Strength | Low | Medium–high | Highest |
| Formability / weldability | Excellent | Very good | Difficult |
| Weight penalty | Low | Low | Low (but costlier) |
| Best fit for hydraulics | Low-pressure service | Balanced & most common | Over-spec for most lines |
In short: Grade 2 is cheapest but limits pressure rating; Grade 5 is stronger but harder and more expensive to form; Grade 9 is the balanced default for aircraft hydraulic and pneumatic lines.
What a Buyer Should Verify Before Ordering
Hydraulic tubing lives or dies on consistency. Before you commit, check: an EN 10204 3.1 mill test report with chemistry and mechanicals, PMI / positive material identification, eddy-current or UT testing on seamless stock, and tight OD/wall tolerances from end to end. Our titanium tube & pipe overview covers the forms and standards we handle.
Why Source Through a China Titanium Partner
As a trading company, our job is to de-risk your buy: we consolidate qualified mills, enforce incoming QC (PMI, UT/ET, EN 10204 3.1), keep MOQs flexible for prototype-to-production runs, and give you transparent lead times instead of vague promises. For aerospace programs specifically, see our tubes en alliage de titane pour applications aérospatiales page.
Obtenir un devis
Need Grade 9 (Ti-3Al-2.5V) hydraulic tubing with full traceability? Request a quote from FDtitanium with your sizes, quantity, and spec — we’ll return a graded offer with MTC and inspection plan.
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