ASTM B338 Grade 9 Titanium Tube (UNS R56320)
ASTM B338 Gr 9 Titanium Tube (UNS R56320) is manufactured from the Ti-3Al-2.5V alloy, combining medium strength with excellent ductility and corrosion resistance. Often referred to as “half 6-4,” Grade 9 provides better cold workability and weldability than Grade 5, making it ideal for tubing applications requiring forming, bending, and lightweight performance.
Key Features
- Produced as per ASTM B338 standard
- UNS R56320 Ti-3Al-2.5V alloy
- High strength with excellent formability
- Superior corrosion resistance in marine and chemical environments
- Good fatigue resistance and weldability
- Lightweight with stable performance over a wide temperature range
Equivalent Grade
| Standard | Equivalent Grade |
|---|---|
| ASTM | ASTM B338 Grade 9 |
| UNS | R56320 |
| ISO | Ti-3Al-2.5V |
| AMS | AMS 4947 |
| DIN | 3.7194 |
| EN | EN 3.7195 |
ASTM B338 Gr 9 Chemical Composition
| Element | Percentage (%) |
|---|---|
| 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 |
Gr 9 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 620 MPa |
| Yield Strength | ≥ 483 MPa |
| Elongation | ≥ 15% |
| Hardness | ≤ 30 HRC |
UNS R56320 Physical Properties
| Property | Value |
|---|---|
| Density | 4.48 g/cm³ |
| Melting Point | 1604 – 1660°C |
| Thermal Conductivity | 7.2 W/m·K |
| Modulus of Elasticity | 105 GPa |
| Electrical Resistivity | 1.7 µΩ·m |
Type of ASTM B338 Gr 9 Pipes
- Seamless Titanium Grade 9 Tubes
- Welded Titanium Grade 9 Tubes
- Precision Tubes
- Heat Exchanger Tubes
- Cold Worked & Annealed Tubes
Applications
- Aerospace and aircraft hydraulic tubing
- Marine and offshore systems
- Chemical processing equipment
- Heat exchangers and condensers
- Automotive and motorsport components
- Lightweight structural tubing
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