ASTM B861 Gr 3 Titanium Pipe ( UNS R50550 )
ASTM B861 Grade 3 Titanium Pipe (UNS R50550) is a commercially pure titanium seamless pipe containing a higher oxygen content compared to Grades 1 and Grade 2, resulting in increased strength while maintaining excellent corrosion resistance. This grade is specifically designed for applications requiring improved mechanical strength without sacrificing the inherent benefits of titanium, such as low density, outstanding resistance to oxidizing and mildly reducing environments, and excellent service life. ASTM B861 Gr 3 titanium pipes are widely used in industrial processing systems where reliability, durability, and resistance to aggressive media are critical.
Key Features
- Commercially Pure Titanium Grade 3
- Higher strength than Grade 1 and Grade 2
- Excellent corrosion resistance in oxidizing environments
- Good weldability and fabricability
Equivalent Grade
| Standard | Equivalent |
|---|---|
| UNS | R50550 |
| ISO | Ti-GR3 |
| DIN | 3.7055 |
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 requirement |
ASTM B861 Gr 3 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Titanium (Ti) | Balance |
| Iron (Fe) | Max 0.30 |
| Oxygen (O) | Max 0.35 |
| Carbon (C) | Max 0.08 |
| Nitrogen (N) | Max 0.05 |
| Hydrogen (H) | Max 0.015 |
Gr 3 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | Min 450 MPa |
| Yield Strength | Min 380 MPa |
| Elongation | Min 18% |
UNS R50550 Physical Properties
| Property | Value |
|---|---|
| Density | 4.51 g/cm³ |
| Melting Point | 1668°C |
| Thermal Conductivity | 16.4 W/m·K |
| Modulus of Elasticity | 103 GPa |
Type of ASTM B861 Gr 3
- Seamless Gr 3 Titanium Pipe
- Annealed Titanium Pipe
- Precision Titanium Tubing
Application
- Chemical and petrochemical processing
- Heat exchangers and condensers
- Power generation systems
- Marine and offshore equipment
- Industrial piping and pressure systems
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