ASTM B338 Gr 3 Titanium Seamless Pipe & Tube (UNS R50550)
ASTM B338 Gr 3 (UNS R50550) specifies seamless and welded pipes and tubes made from commercially pure titanium with higher strength than Grades 1 and 2. Grade 3 offers an excellent balance of strength, corrosion resistance, and weldability, making it suitable for moderately demanding chemical, marine, and industrial process applications.
Key Features
- Commercially pure titanium with enhanced strength
- Excellent resistance to corrosion in oxidizing and mildly reducing environments
- Good weldability and fabrication properties
- Better mechanical strength than Grade 1 and Grade 2
- Lightweight material with high durability
- Suitable for pressure-bearing applications
Equivalent Grade
| Standard | Equivalent |
|---|---|
| UNS | R50550 |
| ASTM | Titanium Grade 3 |
| DIN | 3.7055 |
| ISO | Ti Grade 3 |
| JIS | TP340 |
Sizes
- Outside Diameter (OD): 1/8” to 12”
- Wall Thickness: 0.7 mm to 14 mm
- Length: Random, Double Random, or Cut Length
ASTM B338 Gr 3 Chemical Composition
| Element | Composition (%) |
|---|---|
| Titanium (Ti) | Balance |
| Iron (Fe) | ≤ 0.30 |
| Oxygen (O) | ≤ 0.35 |
| Carbon (C) | ≤ 0.08 |
| Nitrogen (N) | ≤ 0.05 |
| Hydrogen (H) | ≤ 0.015 |
Gr 3 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 380 MPa |
| Yield Strength | ≥ 275 MPa |
| Elongation | ≥ 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 | 105 GPa |
| Electrical Resistivity | 42 µΩ·cm |
Type of Grade 3 Pipes
- Seamless Titanium Pipe
- Welded Titanium Pipe
- Heat Exchanger Tubes
- Condenser Tubes
- Pressure Tubing
Applications
- Chemical and petrochemical processing equipment
- Heat exchangers and condensers
- Marine and offshore piping systems
- Industrial process piping
- Power generation systems
- Desalination and water treatment plants
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