Gr9 Titanium Tube for Aerospace Hydraulic Lines \| Ti-3Al-2.5V, Annealed & CWSR, AMS 4943/4944

Product Overview

Reviewed and maintained by the Engineering Team, Shaanxi Qianyi Tuoda Technology Co., Ltd.

Gr9 Titanium Tube for Aerospace Hydraulic Lines | Ti-3Al-2.5V, Annealed & CWSR

Meta Description: Gr9 (Ti-3Al-2.5V) titanium tube for aerospace hydraulic lines — annealed & CWSR, ASTM B338/B861, AMS 4943/4944 reference, cut-to-length, EN 10204 3.1 heat-traceable. Condition picked by bend radius, not habit. Quote in 24h.

Overview — Why Gr9, Not Gr2 or Gr5

Gr9 (Ti-3Al-2.5V, UNS R56320) is the hydraulic-line alloy. It sits in the sweet spot:

• ~20–50% stronger than CP Gr2, at nearly the same weight (4.48 g/cm³)
• Far more bendable and flareable than Gr5 (Ti-6Al-4V)
• Weldable by GTAW without routine post-weld heat treatment in most lines
• Half the weight of stainless 321/304 hydraulic tubing for the same pressure class

So when an airframe engineer says "I need titanium hydraulic tube," nine times out of ten the drawing says Gr9 — the question is which condition, not which grade.

Annealed vs CWSR — The Real Decision

This is where most enquiries go vague. Pick the temper from the bend radius, not from price.

Rule of thumb: annealed for bends and flares, CWSR for pressure and weight. We don't push CWSR on a 3D bend — it'll fight your bender.

Springback Is a Metallurgy Problem, Not a Bender Problem

Gr9's low elastic modulus (~100 GPa) means it springs back harder than steel. Two things decide whether your CNC bender nails the angle:

1. Uniform anneal: vacuum-annealed, fine equiaxed α+β grain → predictable over-bend angle
2. Oxygen on the cert: run close to the 0.15% O ceiling and you gain strength but lose ductility — bends get cranky. We cite actual O value on MTC, not just "pass."

That's why we treat the MTC as a bending manual, not a shipping formality.

Standard Map (Don't Mix Them Up)

We supply to the spec your PO names. Industrial B338/B861 for plant retrofits; AMS references quoted with mill cert scope confirmed per edition.

Stock & Cut Scope

Gr9 rotates through stock; live heat confirmed before PI. Non-standard wall → mill lead time quoted honest, no "always on shelf" bluff.

Technical Baseline (Annealed, Typical)

Cut-to-Length for Hydraulic Runs

1. PO states: AMS or ASTM edition + condition (ann/CWSR) + OD×wall×len
2. Pull tagged heat; log heat number before cut
3. Square-cut / chamfer / flare-ready deburr (inside + outside)
4. Plastic caps both ends, PE sleeve
5. ECT + hydrostatic per PO NDT matrix
6. MTC 3.1 drafted against mother-heat; O-content line called out explicitly

NDT & Certification

• 100% Eddy Current (ECT) on welded; seamless per PO NDT matrix (UT + ECT)
• Hydrostatic per B338/B861 stress basis when specified
• Flattening / flaring sample reports on request
• EN 10204 Type 3.1 — issued by the original tube mill's independent inspection function, heat-matched
• Actual chemistry (incl. O, Fe, N, H) + mechanical pull-test values on cert
• 3.2 (SGS/BV/TÜV) at buyer cost; NADCAP/AS9100 doc scope confirmed per issuer

Bending & Welding Notes (Shop-Level, Not Marketing)

• GTAW with full argon backing — pool, root, cool zone all shielded
• Any color on the bead = contamination signal, not cosmetics
• Generous bend radius + stress relief after forming = normal practice
• CWSR: expect 5D+ minimum bend radius; annealed: 3D feasible with correct over-bend
• WPS/PQR qualified by your ASME/aircraft MRO shop — we supply clean tube + cert, not the weld procedure

Applications We Actually See

• Aircraft hydraulic transmission lines (landing gear, flight controls)
• Fuel & pneumatic lines (low temp swing, lightweight requirement)
• APU & engine ancillary routing
• UAV / eVTOL high-pressure fluid lines
• Racing hydraulic / brake lines (CWSR favored)
• Ground-test rigs mirroring airframe spec

What We Won't Claim

• No "AS9100-certified factory" unless your PO names the audited entity — we confirm issuer scope, not assume it
• No "approved for Boeing/Airbus" — airframe acceptance is the OEM/MRO QA call, not ours
• No "zero springback" — Gr9 springs; we make it predictable
• No trader MTC passed as mill 3.1

Enquiry Template (Copy-Paste)

Spec: AMS 4943 / 4944 / ASTM B338 / B861 ___
Condition: Annealed / CWSR
Grade: Gr9 (Ti-3Al-2.5V)
OD × Wall: ___ mm × ___ mm
Length: ___ mm × ___ pcs
End: plain / chamfer / flare-ready
Bend radius (if known): ___ D
NDT: ECT / UT / hydro / 3.1 or 3.2
O-content on cert: required (yes)
Heat: any in-stock / match previous ___
Application: aircraft hydraulic / rig / racing
Port: ___ (FOB Shanghai default)

FAQ — Gr9 Aerospace Hydraulic Tube

Q1: Annealed or CWSR — which do I need?
A: Bends + flares → annealed (AMS 4943). 3000–8000 psi straight runs, weight-critical → CWSR (AMS 4944). Tell us bend radius, we'll advise.

Q2: Why does oxygen content matter so much?
A: O drives strength and kills ductility near the 0.15% ceiling. We print actual O value on the MTC so your bender can predict springback.

Q3: Can you supply to AMS 4944 directly?
A: We quote Gr9 CWSR to the AMS edition your PO cites; mill cert scope + NDT matrix confirmed before cutting. We don't self-declare "aerospace approved."

Q4: Is B338 enough for aircraft lines?
A: B338 covers industrial HX/hydraulic tube. Aircraft lines usually name AMS 4943/4944 — we align to the PO spec, not substitute.

Q5: Small qty for prototype?
A: Cut lengths accepted, no forced full-stick buy on stock gauges. Setup stated transparently.

Q6: Can you match previous heat?
A: Send old heat No.; check live shelf. If gone, propose equivalent heat with full 3.1 for QA review pre-cut.

Q7: Flare-ready end — how clean?
A: Deburr inside+out, no oxide, argon-weld ready. Bright-annealed surface default for hydraulic.

Q8: Hydrostatic test pressure?
A: Per ordered spec (B338 ~50% min yield basis) or your line proof pressure — stated in quote, not assumed.

Q9: Lead time?
A: In-stock ann condition, confirmed PO → dispatch per stock workflow. CWSR / non-std wall → mill schedule quoted honest.

Q10: Sample before flight-line use?
A: 1–2 cut pieces from same heat at courier cost; your MRO/metallurgy signs final acceptance.

Request a Quote

Email: sales@[yourdomain].com

Send spec edition + condition + OD×wall×length×qty. Reply within 24 working hours: live heat, condition confirmation, EXW/FOB quote, cert scope.

About: Baoji Titanium Valley inventory holder. Gr9 (Ti-3Al-2.5V) seamless tube for aerospace hydraulic lines — annealed & CWSR, ASTM B338/B861 + AMS 4943/4944 reference per PO, cut-to-length, ECT/hydro per spec, EN 10204 3.1 with actual O-content, heat-traceable. We pick the temper by the bend, not the quote.