ASTM B861 Grade 23 Titanium Pipe Ti-6Al-4V ELI (UNS R56401)
ASTM B861 Grade 23 Titanium Pipe, also known as Ti-6Al-4V ELI (Extra-Low Interstitials) with UNS R56401, is a high-purity alpha-beta titanium alloy developed for critical applications requiring exceptional fracture toughness, fatigue resistance, and corrosion performance. Compared to standard Grade 5, Grade 23 contains reduced levels of oxygen, nitrogen, carbon, and iron, resulting in improved ductility and damage tolerance. ASTM B861 Gr 23 seamless titanium pipes are extensively used in aerospace, medical, and high-performance industrial systems where reliability, cleanliness, and long service life are essential.
Key Features
- Ti-6Al-4V ELI (Extra-Low Interstitials) alloy
- Improved toughness and fatigue resistance over Grade 5
- Excellent corrosion resistance in aggressive environments
- High strength-to-weight ratio
- Superior biocompatibility and cleanliness
- Good weldability and dimensional stability
Equivalent Grade
| Standard | Equivalent |
|---|---|
| UNS | R56401 |
| AMS | AMS 4931 |
| ISO | Ti-6Al-4V ELI |
| DIN | 3.7165 ELI |
Sizes
| Parameter | Range |
|---|---|
| Outside Diameter | 6 mm to 219 mm |
| Wall Thickness | 0.5 mm to 12 mm |
| Length | Random / Cut Length |
| Schedule | As per customer requirement |
ASTM B861 Gr 23 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Titanium (Ti) | Balance |
| Aluminum (Al) | 5.5 – 6.5 |
| Vanadium (V) | 3.5 – 4.5 |
| Iron (Fe) | Max 0.25 |
| Oxygen (O) | Max 0.13 |
| Carbon (C) | Max 0.08 |
| Nitrogen (N) | Max 0.05 |
| Hydrogen (H) | Max 0.012 |
Gr 23 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | Min 860 MPa |
| Yield Strength | Min 795 MPa |
| Elongation | Min 10% |
UNS R56401 Physical Properties
| Property | Value |
|---|---|
| Density | 4.43 g/cm³ |
| Melting Point | 1604 – 1660°C |
| Thermal Conductivity | 6.7 W/m·K |
| Modulus of Elasticity | 113 GPa |
Type of Grade 23 Pipes
- Seamless Grade 23 Titanium Pipe
- Annealed Titanium Alloy Pipe
- Precision ELI Titanium Tubing
- Thin-Wall Titanium Pipe
Application
- Aerospace hydraulic and structural systems
- Medical and biomedical equipment
- Chemical and pharmaceutical processing
- High-performance marine applications
- Critical industrial and pressure systems
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