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A TP347 heat exchanger tube is a seamless austenitic stainless steel tube specifically designed for heat transfer equipment. It is a stabilized grade of 18/8 stainless steel (18% Chromium, 8% Nickel) that contains the element Niobium (Nb) or Columbium (Cb) .
Due to its excellent resistance to intergranular corrosion and high-temperature strength, it is widely used in:
- Shell and tube heat exchangers
- Condensers
- Boilers and superheaters
- Petrochemical refineries
- Power generation plants
The primary advantages of TP347 come from its Niobium (Cb) addition, which stabilizes the material against "sensitization."
1. Superior Resistance to Intergranular Corrosion
- The Problem: Standard stainless steels (like TP304) form "chromium carbide" at grain boundaries when welded or exposed to high heat (800-1500°F / 427-816°C). This creates a chromium-depleted zone that rusts/cracks easily.
- The TP347 Solution: Niobium has a higher affinity for Carbon than Chromium does. It binds with the Carbon first, preventing Chromium from forming carbides.
- Result: The tube retains its corrosion resistance without post-weld heat treatment. This is critical for heat exchangers where welding is required.
2. Excellent High-Temperature Strength
- Creep Resistance: TP347 maintains higher strength under long-term stress at high temperatures compared to TP304 or TP316L.
- Oxidation Resistance: It can withstand continuous service temperatures up to 1500°F (816°C) without scaling significantly.
- Structural Stability: It does not easily deform (creep) under pressure at high temperatures, making it ideal for superheaters and reformers.
3. Good Mechanical Properties
- Tensile Strength: Min. 515 MPa (75,000 psi)
- Yield Strength (0.2% offset): Min. 205 MPa (30,000 psi)
- Elongation: Min. 35%
- These properties ensure it can handle high-pressure fluids safely.
4. Weldability
- It is readily weldable by standard fusion and resistance welding methods.
- Because it is stabilized, the heat-affected zone (HAZ) of the weld remains corrosion-resistant without annealing.
You should select TP347 over standard grades (like 304 or 316) if your heat exchanger operates under any of these conditions:
1. High Temperatures: The operating temperature is above 400°C (750°F) .
2. Welded Construction: The tubes are welded to tubesheets, and you cannot perform a full annealing heat treatment afterward.
3. Corrosive Media: The fluid contains compounds that cause intergranular attack (e.g., hot organic acids, high-purity water, or specific refinery streams).
4. Long-term service: The tube will be under stress for decades at elevated temperatures (creep resistance).
ASTM A213 TP347 Stainless Steel Seamless Tube Chemical Composition
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
Yuhong Group is one of the large scale group company in China, more than 35 years experience in the international market, providing high-quality services to over 3000 customers, end user which like Aramco, Petrobras, Pemex, Petronas, Ecopetro, Petroecuador, …. till now Yuhong Grou...
