Overview
Grade 9 Titanium, also known as Ti-3Al-2.5V, is a medium-strength alpha-beta titanium alloy that provides an excellent balance of strength, formability, weldability, corrosion resistance, and lightweight performance.
Positioned between commercially pure titanium grades and Grade 5 titanium, Grade 9 offers significantly higher strength than Grade 2 while maintaining better cold-forming and welding characteristics than Grade 5. Because of this unique combination, Grade 9 is widely used in aerospace, marine, sporting goods, medical devices, and high-performance tubing applications.
Grade 9 titanium is widely used in:
- Aerospace Tubing
- Hydraulic Systems
- Bicycle Frames
- Marine Equipment
- Medical Devices
- Sporting Goods
- Heat Exchangers
- Structural Components
Due to its excellent tube-forming capability and corrosion resistance, Grade 9 is one of the most popular titanium grades for seamless tubing applications.
Material Specification
| Property | Value |
|---|---|
| Material Designation | Grade 9 Titanium |
| Alloy Name | Ti-3Al-2.5V |
| UNS Number | R56320 |
| ASTM Standard | ASTM B265 / ASTM B338 / ASTM B348 |
| Material Family | Alpha-Beta Titanium Alloy |
| Density | 4.48 g/cm³ |
| Magnetic Property | Non-Magnetic |
| Typical Supply Condition | Annealed |
| Standard Forms | Tube, Pipe, Sheet, Plate, Bar, Rod, Wire |
Chemical Composition
| Element | Content (%) |
|---|---|
| Titanium (Ti) | Balance |
| Aluminum (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 |
The addition of aluminum and vanadium increases strength while preserving good formability and weldability.
Mechanical Properties
Annealed Condition
| Property | Value |
|---|---|
| Tensile Strength | ≥620 MPa |
| Yield Strength | ≥483 MPa |
| Elongation | ≥15% |
| Hardness | 200–260 HB |
| Elastic Modulus | 105 GPa |
Typical Mechanical Performance
| Property | Value |
|---|---|
| Fatigue Resistance | Excellent |
| Impact Toughness | Good |
| Ductility | Good |
| Strength-to-Weight Ratio | Excellent |
Physical Properties
| Property | Value |
|---|---|
| Density | 4.48 g/cm³ |
| Melting Point | 1600–1660°C |
| Thermal Conductivity | 7.5 W/m·K |
| Electrical Conductivity | 2% IACS |
| Electrical Resistivity | 1.55 μΩ·m |
| Thermal Expansion Coefficient | 8.8 × 10⁻⁶/K |
| Specific Heat Capacity | 560 J/kg·K |
Strength-to-Weight Ratio
| Material | Density (g/cm³) | Tensile Strength |
|---|---|---|
| Grade 9 Titanium | 4.48 | 620 MPa |
| Grade 2 Titanium | 4.51 | 345 MPa |
| Grade 5 Titanium | 4.43 | 895 MPa |
| 6061-T6 Aluminum | 2.70 | 310 MPa |
| 316L Stainless Steel | 8.00 | 485 MPa |
Grade 9 provides a superior balance between strength and formability.
Corrosion Resistance
| Environment | Performance |
|---|---|
| Fresh Water | Excellent |
| Salt Water | Excellent |
| Marine Atmosphere | Excellent |
| Chloride Solutions | Excellent |
| Industrial Environment | Excellent |
| Chemical Processing | Very Good |
Grade 9 exhibits corrosion resistance similar to Grade 2 titanium and significantly superior to stainless steels in chloride-rich environments.
Recommended surface treatments:
- Pickling
- Passivation
- Polishing
- Anodizing
- Electropolishing
Fatigue Resistance
| Property | Performance |
|---|---|
| Fatigue Strength | Excellent |
| Cyclic Loading Resistance | Excellent |
| Crack Resistance | Good |
| Vibration Resistance | Excellent |
Grade 9 is widely used in aerospace tubing and bicycle frames because of its excellent fatigue performance.
Weldability
| Welding Process | Rating |
|---|---|
| TIG Welding | Excellent |
| MIG Welding | Good |
| Resistance Welding | Excellent |
| Laser Welding | Excellent |
Grade 9 offers better weldability than Grade 5 titanium.
Machinability
| Process | Rating |
|---|---|
| CNC Turning | Moderate |
| CNC Milling | Moderate |
| Drilling | Moderate |
| Grinding | Good |
| Tube Forming | Excellent |
Machinability Comparison
| Material | Machinability |
|---|---|
| Aluminum 6061 | Excellent |
| Grade 2 Titanium | Moderate |
| Grade 9 Titanium | Moderate |
| Grade 5 Titanium | Difficult |
Grade 9 machines similarly to other titanium alloys but offers superior forming performance.
Heat Treatment
Stress Relief
| Parameter | Value |
|---|---|
| Temperature | 480–650°C |
| Cooling Method | Air Cool |
Annealing
| Parameter | Value |
|---|---|
| Temperature | 700–790°C |
| Cooling Method | Air Cool |
Heat Treatability
| Property | Performance |
|---|---|
| Heat Treat Hardening | Limited |
| Annealing Response | Excellent |
| Cold Work Strengthening | Good |
Grade 9 is generally supplied in the annealed condition.
International Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM (USA) | Grade 9 |
| UNS | R56320 |
| AMS | AMS 4943 |
| DIN (Germany) | 3.7195 |
| EN (Europe) | Ti-3Al-2.5V |
| ISO | Ti-3Al-2.5V |
| GB/T (China) | TC9 |
| JIS (Japan) | Ti-3Al-2.5V |
Available Forms
| Product Type | Availability |
|---|---|
| Tube | Yes |
| Pipe | Yes |
| Sheet | Yes |
| Plate | Yes |
| Round Bar | Yes |
| Wire | Yes |
| Forgings | Yes |
Typical Applications
Aerospace Industry
- Hydraulic Tubing
- Fuel Lines
- Structural Tubes
- Aircraft Components
Marine Industry
- Offshore Equipment
- Seawater Systems
- Marine Tubing
- Corrosion-Resistant Hardware
Bicycle Industry
- Premium Bicycle Frames
- Handlebars
- Seat Posts
- Performance Components
Medical Industry
- Surgical Instruments
- Medical Equipment
- Implant Components
Sporting Goods Industry
- Golf Club Shafts
- Performance Equipment
- Lightweight Structural Components
Industrial Applications
- Heat Exchangers
- Pressure Tubing
- Process Equipment
- Corrosion-Resistant Systems
Manufacturing Characteristics
| Manufacturing Process | Rating |
|---|---|
| CNC Machining | Good |
| Tube Forming | Outstanding |
| Welding | Excellent |
| Hydroforming | Excellent |
| Anodizing | Excellent |
| Polishing | Excellent |
Advantages
Excellent Strength-to-Weight Ratio
Higher strength than commercially pure titanium with minimal weight increase.
Outstanding Tube Formability
One of the best titanium grades for tubing applications.
Excellent Corrosion Resistance
Performs exceptionally well in marine and industrial environments.
Superior Weldability
Easier to weld than Grade 5 titanium.
Good Fatigue Resistance
Ideal for cyclic-loading applications.
Lightweight
Approximately 40–45% lighter than stainless steel.
Limitations
Lower Strength Than Grade 5
Not suitable for the highest-load aerospace structures.
Higher Cost Than Grade 2
Alloy additions increase material cost.
Lower Availability
Less commonly stocked than Grade 2 and Grade 5.
Challenging Machining
Requires proper tooling and cutting parameters.
Comparison with Other Titanium Grades
| Property | Grade 9 | Grade 5 | Grade 2 | Grade 4 |
|---|---|---|---|---|
| Strength | High | Highest | Moderate | Moderate |
| Weldability | Excellent | Good | Outstanding | Excellent |
| Formability | Excellent | Moderate | Excellent | Fair |
| Tube Applications | Outstanding | Good | Good | Limited |
| Corrosion Resistance | Excellent | Excellent | Excellent | Excellent |
Comparison with Common Engineering Materials
| Material | Density | Tensile Strength | Corrosion Resistance |
|---|---|---|---|
| Grade 9 Titanium | 4.48 g/cm³ | 620 MPa | Excellent |
| Grade 5 Titanium | 4.43 g/cm³ | 895 MPa | Excellent |
| 316L Stainless Steel | 8.00 g/cm³ | 485 MPa | Excellent |
| 6061-T6 Aluminum | 2.70 g/cm³ | 310 MPa | Good |
Available Surface Finishes
Raw Finishes
- Mill Finish
- Annealed Finish
- Pickled Finish
Functional Finishes
- Precision Machined Finish
- Polished Finish
- Brushed Finish
Specialty Finishes
- Anodized Finish
- Electropolished Finish
- Aerospace Grade Finish
Frequently Asked Questions (FAQ)
What is Grade 9 titanium?
Grade 9 is a titanium alloy containing approximately 3% aluminum and 2.5% vanadium, offering an excellent balance of strength and formability.
What is Grade 9 titanium used for?
Typical applications include:
- Aerospace Tubing
- Bicycle Frames
- Hydraulic Systems
- Marine Equipment
- Medical Devices
What is the equivalent material to Grade 9 titanium?
Common equivalents include:
- Ti-3Al-2.5V
- UNS R56320
- AMS 4943
- TC9
What is the difference between Grade 9 and Grade 5 titanium?
| Property | Grade 9 | Grade 5 |
|---|---|---|
| Strength | Lower | Higher |
| Weldability | Better | Good |
| Formability | Better | Moderate |
| Tube Applications | Excellent | Good |
Is Grade 9 titanium corrosion resistant?
Yes. It provides excellent resistance to seawater, chlorides, and industrial environments.
Can Grade 9 titanium be welded?
Yes. Grade 9 offers excellent weldability and fabrication characteristics.
Why choose Grade 9 titanium?
Because it combines:
- High Strength
- Excellent Formability
- Outstanding Weldability
- Excellent Corrosion Resistance
- Lightweight Performance
Is Grade 9 titanium suitable for bicycle frames?
Yes. Grade 9 is one of the most popular titanium grades for high-performance bicycle tubing.
Does GCNOV provide custom manufacturing services for Grade 9 titanium?
Yes. GCNOV provides:
- CNC Machining
- Titanium Tube Fabrication
- Precision Welding
- Aerospace Component Manufacturing
- Surface Finishing
- Prototype Development
- Low-Volume Production
- Mass Production