The problem with hydraulic lines
Hydraulic fluid under pressure wants out. Fittings leak. Tubes crack. Vibration work-hardens metal over time.
On an aircraft, a burst hydraulic line means lost controls. Not acceptable.
Titanium alloy tube for aerospace hydraulic systems solves the weight problem without creating a reliability problem. Lighter than steel. Doesn't corrode like stainless. Doesn't fatigue the way aluminum does.
Grade 9 Ti-3Al-2.5V was invented for this exact job. Aerospace hydraulic tubing.
Why Grade 9, not Grade 5
Grade 5 is stronger. Everyone knows that. But Grade 5 is harder to bend, harder to flare, harder to work with in tube form.
Grade 9 is the tube alloy. It bends without cracking. It flares without splitting. It holds pressure without bursting.
Titanium alloy tube for aerospace hydraulic systems uses Grade 9 because tubing needs formability. You can't put a 3x OD bend in Grade 5 without a lot of trouble. Grade 9 does it all day.
Save Grade 5 for structural bolts and landing gear. Use Grade 9 for tube.
What the spec says
| Property | Grade 9 (Ti-3Al-2.5V) |
| Standard | AMS 4945 |
| Tensile | ≥ 620 MPa |
| Yield | ≥ 483 MPa |
| Elongation | ≥ 15% |
| Density | 4.48 g/cm³ |
| Hardness | ~30 HRC |
| Max operating temp | 135°C |
Typical hydraulic sizes
| OD (mm) | Wall (mm) | Working pressure (psi) |
| 6.35 | 0.71 | 3000 |
| 9.53 | 0.89 | 3000-4000 |
| 12.70 | 1.02 | 4000-5000 |
| 15.88 | 1.24 | 5000 |
| 19.05 | 1.47 | 5000 (main lines) |
All sizes meet AMS 4945. Full traceability. Heat number on every tube.
Where you find this tube
Open an aircraft hydraulic bay. Follow the orange lines (Skydrol color). Many of them are titanium alloy tube for aerospace hydraulic systems.
- Landing gear. Big tubes. High flow. High pressure. Titanium keeps the weight off the gear.
- Flight controls. Runs through the wings to ailerons and flaps. Vibration from airflow. Titanium handles it.
- Brake lines. From the cockpit pedals to the wheels. Long runs. Multiple fittings.
- Thrust reverser lines. Near the engine. Higher temperatures. Grade 9 still works.
- Nose wheel steering. Tight bends. Small diameters. Titanium forms the tight bends without kinking.
Every one of these lines used to be steel. Now they're titanium on most new aircraft.
The weight math
Steel tube density: 7.8 g/cm³. Grade 9 titanium: 4.48 g/cm³.
For the same OD and wall thickness, titanium tube is 42% lighter.
On a widebody jet, hydraulic tube weighs hundreds of pounds. Switching to titanium saves over 100 pounds per aircraft. Times thousands of aircraft. Real fuel savings.
Titanium alloy tube for aerospace hydraulic systems pays for itself in fuel over the life of the plane.
Bending and forming
Titanium tube springs back. About 10-15% more than steel. You learn to overbend.
Use a rotary draw bender with a mandrel. No crush bending. No hand bending.
Lubricate the inside and outside. Titanium galls without lube.
For titanium alloy tube for aerospace hydraulic systems, we supply tube in coils. Coils let you run long lengths with no intermediate splices. Fewer fittings. Lower leak risk.
Minimum bend radius for Grade 9 tube: 3x OD for thin wall. 4x OD for thick wall. Tighter radii possible with special tooling. Ask us.
Flaring
37° flare per SAE AS4841. Standard aircraft fitting.
Flaring titanium is different. It work-hardens. If you go too fast or too deep, the flare cracks.
Use a powered flaring tool. Slow speed. Steady pressure. Lubricate the cone.
After flaring, inspect the flare face. No cracks. No scratches. No off-center flares.
We can pre-flare tube ends before shipping. Many aerospace shops take this option. One less process to qualify in-house.
Fittings and connections
Titanium tube works with standard aerospace fittings. Steel fittings. Aluminum fittings. Titanium fittings if you want to save more weight.
The fitting choice affects galvanic corrosion. Steel on titanium is fine in dry aircraft environments. No electrolyte. No corrosion.
For titanium alloy tube for aerospace hydraulic systems, most OEMs use steel fittings. Proven. Available. Cost effective.
Don't mix fitting types on the same line. Pick one. Stay with it.
Pressure testing
Every hydraulic tube gets pressure tested before it flies.
Hydrostatic or pneumatic. AMS 4945 requires proof pressure of 1.5x working pressure. No leaks. No permanent deformation.
We pressure test every tube lot. Reports available. Keep them for your quality file.
For titanium alloy tube for aerospace hydraulic systems, pressure test is the final check before the tube goes in the crate.
FAQ
Q: Grade 9 vs Grade 2 - why not use pure titanium?
A: Grade 2 is pure titanium. Tensile 345 MPa. Too weak for 5000 psi hydraulic systems. Grade 9 gives you 620 MPa. Almost double. You need the strength.
Q: Can I weld Grade 9 tube?
A: Yes but most hydraulic systems don't weld tube. They use fittings. Welding titanium tube requires argon purge inside and out. Doable but not common. Fittings are standard.
Q: What about skydrol compatibility?
A: Grade 9 is fully compatible with Skydrol and other phosphate-ester hydraulic fluids. No swelling. No corrosion. No degradation. The tube outlasts the seals.
Q: What certifications come with the tube?
A: AMS 4945 cert. MTR with heat number. Flatten and flare test reports. NDT report. Pressure test report. EN 10204 3.1. 3.2 available.
Q: Lead time?
A: Stock sizes (6.35mm, 9.53mm, 12.7mm OD) ship in 10-14 days. Non-stock sizes 4-6 weeks. Coils add 1-2 weeks.
The bottom line
Aircraft hydraulic systems run at high pressure. They run hot. They run for decades.
Titanium alloy tube for aerospace hydraulic systems handles all of it. Grade 9. Seamless. Cold worked.
Lighter than steel. Stronger than aluminum. Doesn't corrode like stainless.
Bends. Flares. Holds pressure. That's the job.
Contact
Need a quote on titanium alloy tube for aerospace hydraulic systems? Send OD, wall thickness, length (straight or coil), quantity, and any special requirements. We'll reply within 24 hours.
Email: shawn@mt-titanium.com
WhatsApp: +86-18220745501
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