A213 TP347H Stainless Steel Seamless Boiler Tubes For Heat-Resistant Applications
A213 TP347H Stainless Steel Seamless Boiler Tubes For Heat-Resistant Applications
A213 TP347H is a high-alloy austenitic stainless steel grade specifically developed for high-temperature and high-pressure applications, such as boilers, heat exchangers, and superheaters. It is a seamless tube manufactured according to the ASTM A213 standard, which specifies the requirements for ferritic and austenitic alloy steel tubes for heat-resistant applications. The addition of columbium (niobium) in the alloy enhances its high-temperature strength and resistance to sensitization, making it ideal for use in environments with extreme heat.
Key Features
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High-Temperature Resistance
TP347H is designed to withstand prolonged exposure to high temperatures, up to 650°C (1202°F), without losing strength or stability. Its superior creep strength makes it suitable for pressure-containing applications in boilers and superheaters. -
Enhanced Corrosion Resistance
The alloy contains chromium (18-20%) and nickel (9-13%), providing excellent resistance to oxidation and corrosion in both oxidizing and reducing environments. The addition of columbium helps resist intergranular corrosion, especially in high-temperature environments. -
Seamless Construction
Manufactured as seamless tubes, A213 TP347H ensures uniformity, superior strength, and the ability to perform under high-pressure conditions without the risk of leakage. -
Good Weldability
The material offers good weldability, allowing it to be joined to other components with minimal risk of cracking or defects during the welding process. -
Stabilized Composition
The stabilization provided by columbium prevents carbide precipitation during welding or exposure to high temperatures, enhancing its mechanical properties.
Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.04 – 0.10 |
| Silicon (Si) | ≤ 0.75 |
| Manganese (Mn) | ≤ 2.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Chromium (Cr) | 18.0 – 20.0 |
| Nickel (Ni) | 9.0 – 13.0 |
| Columbium (Nb) | 10 × C% – 1.00% (min) |
Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength (min) | 515 MPa (75 ksi) |
| Yield Strength (min) | 205 MPa (30 ksi) |
| Elongation (min) | 35% |
| Hardness (max) | 89 HRB or 217 HB |
Applications
Due to its outstanding performance in high-temperature and corrosive environments, A213 TP347H stainless steel seamless boiler tubes are widely used in:
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Power Generation
- Boilers, reheaters, and superheaters in thermal power plants.
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Petrochemical and Refining Industries
- Heat exchangers and process equipment operating at elevated temperatures.
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Chemical Processing
- Components exposed to corrosive agents and high-temperature environments.
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Furnace Tubes
- Tubes used in high-temperature furnace systems and industrial heating equipment.
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Nuclear Industry
- Steam generators and heat exchangers in nuclear power plants.
Advantages
- Stability at High Temperatures: The alloy maintains its mechanical properties and resists creep deformation even at high operating temperatures.
- Excellent Oxidation Resistance: Performs well in oxidizing environments due to the chromium content.
- Improved Weldability: Suitable for both automatic and manual welding techniques.
- Long Service Life: High resistance to wear, corrosion, and thermal fatigue ensures extended operational life.
- Cost-Effective: Despite higher initial costs, the durability and reduced maintenance needs make it a cost-effective choice over time.
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