Titanium Grade 9 (Ti-3Al-2.5V) · UNS R56320 · W. Nr. 3.7195
Titanium Grade 9 (Ti-3Al-2.5V) (R56320): composition, properties, fittings and flanges
Titanium Grade 9 (Ti-3Al-2.5V) (R56320, W. Nr. 3.7195) is Alpha-beta titanium alloy for seamless hydraulic tubing. Titanium Grade 9 (Ti-3Al-2.5V) is specified at Titanium Balance, Aluminium 2.50 - 3.50. Grade 9 was created for aircraft hydraulic tubing: 3 % aluminium and 2.5 % vanadium give about twice the strength of Grade 2…
- UNS
- R56320
- W. Nr.
- 3.7195
- Density
- 4.48 g/cm³ (0.162 lb/in³)
- Key strength
- 620 MPa / 90 ksi
Identification and standards
| Short form | Titanium Grade 9 (Ti-3Al-2.5V) · UNS R56320 · W. Nr. 3.7195 |
|---|---|
| Classification | Alpha-beta titanium alloy for seamless hydraulic tubing |
| UNS | R56320 |
| Werkstoff number | 3.7195 |
| Material family | Titanium Alloys |
Chemical composition
| Element | Composition (wt %) | Why it is there |
|---|---|---|
| Titanium (Ti) | Balance | Matrix |
| Aluminium (Al) | 2.50 - 3.50 | Alpha stabiliser and strength |
| Vanadium (V) | 2.00 - 3.00 | Beta stabiliser and formability |
| Iron (Fe) | 0.25 max | Controlled for corrosion resistance |
| Oxygen (O) | 0.15 max | Interstitial strengthening |
| Carbon (C) | 0.08 max | - |
| Nitrogen (N) | 0.03 max | - |
| Hydrogen (H) | 0.015 max | Hydride control |
Note Single figures are maximum limits unless shown as a range. Always confirm against the heat-specific EN 10204 3.1 certificate supplied with your order.
Mechanical properties
| Tensile strength, min (annealed) | 620 MPa / 90 ksi |
|---|---|
| 0.2 % yield strength, min | 483 MPa / 70 ksi |
| Elongation in 2 in, min | 15 % |
| Typical hardness, annealed | 200 - 250 HB |
| Strength vs Grade 2 tubing | About double the yield strength |
Warning Values depend on product form, section thickness and heat treatment. Larger sections generally achieve lower strength than thin product; always design against the applicable code allowable stress rather than these figures.
Physical properties
| Density | 4.48 g/cm³ (0.162 lb/in³) |
|---|---|
| Melting range | 1650 - 1700 °C (3000 - 3090 °F) |
| Modulus of elasticity | 107 GPa (15.5 x 10⁶ psi) |
| Thermal conductivity at 20 °C | 8.3 W/m·K |
| Mean coefficient of thermal expansion, 20-100 °C | 9.0 µm/m·°C |
| Specific heat capacity | 540 J/kg·K |
Specifications by product form
| Forgings & flanges | ASTM B381 Grade F-9 · ASME SB-381 |
|---|---|
| Butt weld fittings | ASTM B363 WPT-9 · ASME SB-363 |
| Seamless pipe & tube | ASTM B861 / B338 Grade 9 |
| Plate / sheet / strip | ASTM B265 Grade 9 · ASME SB-265 |
| Bar / rod | ASTM B348 Grade 9 |
| Welding consumables | ERTi-9 or ERTi-5 depending on required strength |
| UNS / EN / China | UNS R56320 · W. Nr. 3.7195 · GB TA18 |
Product forms available
Hangbo supplies this grade in the following forms. Sizes outside the listed range can often be produced to order.
- Forged flanges blanks and finished flanges to ASME B16.5, B16.47 Series A/B and B16.36
- Butt weld elbows, tees, reducers, caps and stub ends to ASME B16.9 and MSS SP-43
- Seamless pipe and tube to the applicable ASTM / ASME pipe specification
- Forged rings, discs and hubs machined to your drawing
Typical applications
- Aircraft and aerospace hydraulic and fuel tubing
- Bicycle, motorsport and marine tube frames
- Offshore and subsea control lines and umbilicals
- High-pressure lightweight piping systems
Welding, forming and machining
- Welding
- Weldable with ERTi-9 filler under full argon shielding. The alloy is normally used in tube form, where orbital GTAW gives the most consistent joints.
- Heat treatment
- Anneal at 700 - 785 °C and cool in air, or stress relieve at 480 - 595 °C without losing the cold-worked strength.
- Hot and cold forming
- Hot work in the range stated by the mill for this grade, then re-solution or re-age before final machining so that the delivered condition matches the certificate.
- Machining
- Machine with sharp carbide or high-speed steel tooling, positive rake, constant feed and ample coolant. Never dwell - the surface work-hardens quickly.
Buy Titanium Grade 9 (Ti-3Al-2.5V) from Hangbo
Material is supplied with full heat-number traceability, solution annealing or ageing performed under calibrated furnace control, and an EN 10204 3.1 certificate covering chemical analysis, mechanical properties, heat treatment records and the agreed NDT scope. Positive material identification and third party inspection and test reports from SGS are available for critical service.