Titanium Grade 9, or Ti-3Al-2.5V, is a medium-strength titanium alloy offering an attractive combination of strength, corrosion resistance, fatigue performance and formability.
It provides significantly greater strength than commercially pure titanium while generally being easier to cold form than Grade 5 Ti-6Al-4V.
Grade 9 is designated UNS R56320.
Grade 9 Chemical Composition
| Element | Weight % |
|---|---|
| Titanium (Ti) | Balance |
| Aluminium (Al) | 2.5–3.5 |
| Vanadium (V) | 2.0–3.0 |
| Iron (Fe) | ≤ 0.25 |
| Oxygen (O) | ≤ 0.15 |
| Carbon (C) | ≤ 0.08 |
| Nitrogen (N) | ≤ 0.03 |
| Hydrogen (H) | ≤ 0.015 |
Titanium is therefore the balance—approximately 94–95% on a nominal basis—not approximately 90%.
Grade 9 Mechanical Properties
Representative minimum values include:
| Property | Value |
|---|---|
| Ultimate tensile strength | ≥ 620 MPa |
| 0.2% yield strength | ≥ 483 MPa |
| Elongation | ≥ 15% |
| Density | approximately 4.48–4.49 g/cm³ |
Characteristics
Grade 9 occupies a useful position between commercially pure titanium and the much stronger Grade 5 alloy.
It is particularly useful where designers need greater strength than Grade 2, good fatigue resistance, thin-wall capability, useful room-temperature formability, good corrosion resistance and lower density than steels.
Typical Applications
- Aircraft hydraulic and pneumatic tubing
- Aerospace structures
- Lightweight tubing
- Heat-exchanger tubing
- Bicycle frames
- Motorsport components
- Sporting equipment
- Marine and industrial tubing
Common Specifications
- ASTM B265
- AMS 4943
- Other product-form specifications as applicable
Technical Note
Chemical and mechanical properties shown are representative of commonly referenced specifications. Requirements can vary by product form, thickness, heat treatment and governing standard. Material should be ordered to the required specification, and the supplied material test report (MTR) should be used to verify compliance.
