ASTM B861 Gr 21 Titanium Seamless Pipe (UNS R56700)
ASTM B861 Gr 21 (UNS R56700) is a titanium alloy seamless pipe based on Ti-15Mo-3Nb-3Al-0.2Si, offering excellent strength, outstanding corrosion resistance, and superior performance in high-temperature and aggressive chemical environments. It is widely used in aerospace, chemical processing, and high-performance industrial systems.
Key Features
- High strength titanium alloy with excellent creep resistance
- Superior corrosion resistance in oxidizing and reducing media
- Good weldability and fabricability
- Excellent performance at elevated temperatures
- Lightweight with high structural reliability
Equivalent Grades
- ASTM: Grade 21
- UNS: R56700
- Alloy Name: Ti-15Mo-3Nb-3Al-0.2Si
ASTM B861 Gr 21 Chemical Composition
| Element | Content (%) |
|---|---|
| Molybdenum (Mo) | 14.0 – 16.0 |
| Niobium (Nb) | 2.0 – 4.0 |
| Aluminum (Al) | 2.5 – 3.5 |
| Silicon (Si) | ≤ 0.25 |
| Iron (Fe) | ≤ 0.25 |
| Oxygen (O) | ≤ 0.15 |
| Carbon (C) | ≤ 0.08 |
| Nitrogen (N) | ≤ 0.05 |
| Hydrogen (H) | ≤ 0.015 |
| Titanium (Ti) | Balance |
Gr 21 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 620 MPa |
| Yield Strength | ≥ 483 MPa |
| Elongation | ≥ 15% |
UNS R56700 Physical Properties
| Property | Value |
|---|---|
| Density | 4.9 g/cm³ |
| Melting Point | ~1660 °C |
| Modulus of Elasticity | 110 GPa |
| Thermal Conductivity | 7.5 W/m·K |
Types
- Seamless Round Titanium Pipe
- Precision Titanium Tubing
- Heat Exchanger Tubes
- Aerospace Grade Tubes
Applications
- Aerospace structural and hydraulic systems
- Chemical processing equipment
- High-temperature industrial piping
- Power generation systems
- Corrosion-resistant fluid handling systems
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