ASTM A213 TP347 Stainless Steel Tubes (UNS S34700)
ASTM A213 TP347 Stainless Steel Tubes (UNS S34700) are titanium and niobium stabilized austenitic stainless steel tubes specifically engineered for use in high-temperature and corrosive environments. As a stabilized grade, TP347 prevents carbide precipitation during welding or prolonged exposure to elevated temperatures, offering superior resistance to intergranular corrosion when compared to standard grades like TP304 and TP321. These tubes are widely used in boilers, superheaters, heat exchangers, refinery heaters, and chemical processing systems where resistance to thermal fatigue, oxidation, and high-temperature stress is essential.
Manufactured using premium cold-drawn and hot-finished processes, ASTM A213 TP347 tubes deliver exceptional dimensional accuracy, surface finish, and long-term structural stability. Their enhanced mechanical strength, combined with excellent resistance to aggressive media such as acids, hot steam, and combustion gases, makes them a preferred choice across power generation, chemical industries, and petrochemical plants.
Key Features
- Stabilized with niobium/columbium, ensuring superior resistance to intergranular corrosion
- Excellent elevated-temperature strength and creep resistance
- High resistance to oxidation and scaling up to 870°C
- Superior weldability and formability
- Uniform and smooth internal surface for efficient heat transfer
- Excellent performance under thermal cycling and pressure fluctuations
- Suitable for high-pressure and high-temperature steam service
Equivalent Grades
| Standard | Grade |
|---|---|
| EN | X6CrNiNb18-10 |
| UNS | S34700 |
| WNR | 1.4550 |
Available Sizes
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Outside Diameter: 6 mm to 101.6 mm
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Wall Thickness: 0.5 mm to 12.7 mm
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Length: Up to 12 meters
ASTM A213 TP347 Chemical Composition
| Element | % |
|---|---|
| Carbon (C) | ≤0.08 |
| Chromium (Cr) | 17.0–19.0 |
| Nickel (Ni) | 9.0–13.0 |
| Niobium/Columbium (Nb/Cb) | 10 × C min – 1.00 max |
| Manganese (Mn) | ≤2.00 |
| Silicon (Si) | ≤0.75 |
| Phosphorus (P) | ≤0.045 |
| Sulfur (S) | ≤0.030 |
| Nitrogen (N) | ≤0.10 |
ASTM A213 TP347 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥515 MPa |
| Yield Strength | ≥205 MPa |
| Elongation | ≥35% |
| Hardness | ≤192 HB |
Physical Properties
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Range | 1398–1454°C |
| Thermal Conductivity | 16 W/m-K |
| Modulus of Elasticity | 193 GPa |
| Electrical Resistivity | 0.73 µΩ-m |
Types
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Seamless Boiler Tubes
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Seamless Superheater Tubes
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Heat Exchanger Tubes
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Polished Instrumentation Tubes
Applications
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Power Plant Boilers
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Superheaters & Reheaters
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Petrochemical Heaters
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Heat Exchangers
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Chemical Processing Units
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High-Temperature Steam Lines
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Refinery Piping Systems
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