Grade 9 (Ti-3Al-2.5V) vs Grade 5 (Ti-6Al-4V) Titanium: Comparison
Jan 19, 2026
Introduction
Grade 5 titanium (Ti-6Al-4V) is the best-known titanium alloy in the world, specified wherever maximum strength is required. Grade 9 titanium (Ti-3Al-2.5V) is a lower-alloyed alpha-beta grade that trades some strength for cold formability and production economy. Both are alpha-beta alloys with aluminum and vanadium as the primary additions, but the differences in composition change how they are processed, what forms are available, and what they cost to fabricate. This article compares the two on engineering data per ASTM B265 and on manufacturing behavior.
Composition
| Element | Grade 5 (Ti-6Al-4V) | Grade 9 (Ti-3Al-2.5V) |
|---|---|---|
| Aluminum | 5.5-6.75% | 2.5-3.5% |
| Vanadium | 3.5-4.5% | 2.0-3.0% |
| Iron | Max 0.40% | Max 0.25% |
| Oxygen | Max 0.20% | Max 0.15% |
| Titanium | Balance | Balance |
UNS designations are R56400 for Grade 5 and R56320 for Grade 9. Both grades respond to annealing and can be strengthened further by heat treatment in specific product forms.
Mechanical Properties
| Property (min, annealed) | Grade 5 | Grade 9 |
|---|---|---|
| Tensile strength | 895 MPa | 620 MPa |
| Yield strength | 828 MPa | 483 MPa |
| Elongation | 10% | 15% |
| Density | 4.43 g/cm³ | 4.48 g/cm³ |
Grade 5 offers roughly 45 percent higher minimum tensile strength. Grade 9 offers 50 percent higher minimum elongation, which translates directly into better bending, drawing, and rolling behavior.
Formability: The Defining Difference
Grade 9 is designed to be cold formed. It can be stamped, drawn, roll-formed, and bent at room temperature, and it is available in coil, strip, wire, and foil down to very thin gauges. This makes it the natural choice for precision components produced in volume: hydraulic tubing, aerospace ducting, honeycomb core, bellows, and medical instrumentation. Grade 5 cannot be cold formed reliably; it must be hot formed with contact heating, which requires special tooling and slower cycle times. When a component can be made from Grade 9, the savings in tooling, energy, and cycle time are usually decisive.
Weldability and Fabrication
Both grades weld with GTAW, plasma arc, or electron beam under inert shielding, and both require protection of the weld zone above roughly 250 °C to prevent oxygen and nitrogen pickup. Grade 9 is somewhat more forgiving in thin-gauge welding because its lower strength reduces restraint and distortion. Filler selection should match the base grade, and weld procedure qualification follows standards such as AWS D17.1 for aerospace applications.
Corrosion Resistance
Both alloys resist seawater, chlorides, and industrial atmospheres through the same self-healing TiO₂ film. In most marine and chemical service their corrosion performance is comparable, and both are far more resistant than aluminum and most steels. Where high strength and corrosion resistance are required together, Grade 5 dominates; where formability is added to the requirement, Grade 9 is the practical answer.
Applications
| Grade 5 (Ti-6Al-4V) | Grade 9 (Ti-3Al-2.5V) |
|---|---|
| Aerospace structural parts and engine components | Hydraulic and pneumatic tubing |
| Orthopedic implants (with ELI variant Grade 23) | Aerospace ducting and honeycomb |
| Fasteners and fittings in harsh service | Medical instrumentation and pacemaker cases |
| High-performance automotive and motorsport parts | Bicycle frames, golf shafts, tennis rackets |
| Marine and chemical equipment requiring maximum strength | Bellows, expansion joints, thin-gauge strip |
Cost and Manufacturing Economics
Grade 5 costs more to process at every step: vacuum melting, hot forming, machining, and the higher value of tied-up inventory raise the cost of a finished part. Machining scrap that mixes with grinding media cannot be re-melted economically, increasing yield loss. Grade 9, supplied as coil or strip, supports continuous cold processing and just-in-time ordering, which reduces warehousing and scrap. For a component whose loads are within Grade 9's capability, the total landed cost is typically well below the Grade 5 equivalent.
Frequently Asked Questions
Which is stronger, Grade 5 or Grade 9 titanium?
Grade 5 (Ti-6Al-4V) with a minimum 895 MPa tensile strength is significantly stronger than Grade 9's 620 MPa. Where loads demand it, Grade 5 is required.
Can Grade 9 titanium be cold formed?
Yes, that is its defining advantage. Grade 9 can be stamped, drawn, roll-formed, and bent cold, and it is available in coil, strip, wire, and thin foil.
Why is Grade 5 so hard to form?
Its high strength at room temperature makes cold forming impractical; it must be hot formed with special tooling, adding cost and cycle time.
Is Grade 9 cheaper than Grade 5?
Grade 9 is usually cheaper per kilogram than Grade 5, and the processing cost advantage is larger still, because cold forming replaces hot forming and the alloy is available in coil for continuous production.
Are the two grades weldable?
Both weld well under inert shielding with matching filler. Grade 9 shows less distortion in thin-gauge work; both need protection above roughly 250 °C during welding.
Which grade should I choose for hydraulic tubing?
Grade 9 is the standard choice for aerospace and industrial hydraulic tubing: it cold forms into tight bends, welds cleanly, and meets pressure ratings with its 620 MPa minimum tensile strength.
