ASTM B861 Gr 25 Titanium Seamless Pipe (UNS R56401)
ASTM B861 Gr 25 (UNS R56401) is a high-performance titanium alloy seamless pipe manufactured from Ti-6Al-4V ELI (Extra Low Interstitial) composition. It provides superior fracture toughness, excellent fatigue strength, and outstanding corrosion resistance, making it ideal for aerospace, medical, and high-pressure industrial applications.
Key Features
- Extra Low Interstitial (ELI) titanium alloy for enhanced toughness
- Excellent strength-to-weight ratio
- Superior fatigue and crack resistance
- Very good corrosion resistance in aggressive environments
- Suitable for critical and pressure-bearing applications
Equivalent Table
| Standard / System | Equivalent Grade |
|---|---|
| ASTM | Grade 25 |
| UNS | R56325 |
| Alloy Designation | Ti-6Al-4V |
| ISO | ISO 5832-3 |
| AMS | AMS 4928 / AMS 4930 |
| DIN | 3.7165 |
| EN | EN 10204 / EN 3.7165 |
| JIS | JIS H 4600 Class 60 |
Sizes
- Outside Diameter: 6 mm to 114.3 mm
- Wall Thickness: 0.5 mm to 10 mm
- Length: Random, Single Random, Double Random, Cut Length
ASTM B861 Gr 25 Chemical Composition
| Element | Content (%) |
|---|---|
| Aluminum (Al) | 5.5 – 6.5 |
| Vanadium (V) | 3.5 – 4.5 |
| Iron (Fe) | ≤ 0.25 |
| Oxygen (O) | ≤ 0.13 |
| Carbon (C) | ≤ 0.08 |
| Nitrogen (N) | ≤ 0.05 |
| Hydrogen (H) | ≤ 0.0125 |
| Titanium (Ti) | Balance |
Gr 25 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 860 MPa |
| Yield Strength | ≥ 795 MPa |
| Elongation | ≥ 10% |
| Reduction of Area | ≥ 25% |
UNS R56401 Physical Properties
| Property | Value |
|---|---|
| Density | 4.43 g/cm³ |
| Melting Point | ~1660 °C |
| Modulus of Elasticity | 114 GPa |
| Thermal Conductivity | 6.7 W/m·K |
Type of ASTM B861 Gr 25
- Seamless Round Titanium Pipe
- Precision Aerospace Tubing
- Hydraulic and Structural Tubes
Applications
- Aerospace structural and hydraulic systems
- Medical and surgical equipment
- High-pressure chemical processing lines
- Marine and offshore components
- Power generation and advanced engineering systems
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