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Introduction to TP347H Stainless Steel Pipes
TP347H stainless steel pipes are premium-grade austenitic stainless steel pipes designed for high-temperature applications. These pipes are widely used in power generation, petrochemical, and aerospace industries due to their exceptional resistance to oxidation and corrosion at elevated temperatures. Unlike standard 347 stainless steel, TP347H features a higher carbon content (0.04-0.10%) for enhanced strength and creep resistance.
Comparison of TP347H Stainless Steel Pipe Types
| Type | Maximum Operating Temp (°C) | Key Features | Primary Applications |
|---|---|---|---|
| TP347H Pressure Parts | 650 | High creep strength, excellent oxidation resistance | Power plant superheaters, reheaters |
| TP347H Oxidation Resistant | 850 | Superior oxidation resistance | Furnace components, exhaust systems |
| TP347H Seamless | – | No weld seam, improved mechanical properties | High-pressure applications |
| TP347H Welded | – | Cost-effective, suitable for non-critical applications | General industrial use |
Understanding TP347H Stainless Steel Pipes
Material Composition and Properties
TP347H is an austenitic stainless steel alloy containing:
– Chromium (17.0-19.0%)
– Nickel (9.0-13.0%)
– Niobium (8*C-1.1%)
– Carbon (0.04-0.10%)
The niobium content provides excellent intergranular corrosion resistance, making TP347H ideal for high-temperature applications.
Manufacturing Process
TP347H pipes can be manufactured using two main processes:
1. Seamless Process: Ideal for high-pressure applications
2. Welded Process: Cost-effective for non-critical applications
The pipes are typically hot finished or cold finished based on specific requirements.
Applications and Industries
Power Generation Industry
TP347H pipes are extensively used in power plants for:
– High-temperature superheaters
– Reheaters
– Platen superheaters
– High-pressure pipe fittings
Petrochemical Industry
In petrochemical plants, TP347H pipes are used for:
– Reactor vessels
– Heat exchangers
– Process piping
– Furnace tubes
Aerospace Industry
The aerospace sector utilizes TP347H pipes for:
– Engine components
– Exhaust systems
– High-temperature ducting
– Structural supports
Technical Specifications
Chemical Composition Requirements
| Element | Minimum % | Maximum % |
|---|---|---|
| Carbon (C) | 0.04 | 0.10 |
| Silicon (Si) | – | 1.00 |
| Manganese (Mn) | – | 2.00 |
| Phosphorus (P) | – | 0.045 |
| Sulfur (S) | – | 0.030 |
| Chromium (Cr) | 17.0 | 19.0 |
| Nickel (Ni) | 9.0 | 13.0 |
| Niobium (Nb) | – | 8*C-1.1 |
Mechanical Properties
| Property | Minimum Value |
|---|---|
| Tensile Strength | 515 MPa |
| Yield Strength | 205 MPa |
| Elongation | 35% |
| Hardness (HB) | 192 |
Quality Control and Testing
Standard Tests
- Chemical Composition Analysis
- Tensile Testing
- Hardness Testing
- Flattening Test
- Flaring Test
- Non-Destructive Testing (NDT)
- Surface Inspection
- Dimensional Check
Special Requirements
For high-temperature applications, additional tests may include:
– Intergranular Corrosion Testing
– Creep Testing
– High-Temperature Tensile Testing
– Thermal Cycling Tests
Installation and Maintenance
Welding Guidelines
TP347H pipes can be welded using:
– Manual welding electrode (AO 102, AO 107, AO 132)
– TIG welding wire (ER-347)
– For dissimilar metal welding: ENiCrFe-3 or ERNiCr-3
Maintenance Tips
- Regular inspection of high-temperature sections
- Monitoring for oxidation and scaling
- Proper cleaning procedures
- Temperature monitoring systems
- Regular non-destructive testing
Environmental Considerations
Corrosion Resistance
TP347H offers excellent resistance to:
– Organic acids at moderate temperatures
– Salt solutions (sulfates, sulfides, sulfites)
– Caustic environments at moderate temperatures
Temperature Limits
- Maximum operating temperature for pressure parts: 650°C
- Maximum operating temperature for oxidation resistance: 850°C
- Generally used above 500°C where wet corrosion is not relevant
Technical Features Comparison
| Feature | TP347H | Standard 347 | 316H |
|---|---|---|---|
| Maximum Operating Temp | 850°C | 650°C | 650°C |
| Carbon Content | 0.04-0.10% | 0.04-0.10% | 0.04-0.10% |
| Niobium Content | 8*C-1.1% | 0.45-1.00% | – |
| Creep Strength | Excellent | Good | Good |
| Oxidation Resistance | Excellent | Good | Good |
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Conclusion
TP347H stainless steel pipes are premium-grade austenitic stainless steel pipes designed for high-temperature applications. These pipes are widely used in power generation, petrochemical, and aerospace industries due to their exceptional resistance to oxidation and corrosion at elevated temperatures. Unlike standard 347 stainless steel, TP347H features a higher carbon content (0.04-0.10%) for enhanced strength and creep resistance.
FAQ
What is TP347H stainless steel pipe?
TP347H is a high-carbon variation of stainless steel 347H, designed for enhanced resistance against oxidation and corrosion at elevated temperatures. It is widely used in petrochemical, power generation, and aerospace industries due to its ability to withstand temperatures up to 850°C.
What are the main applications of TP347H pipes?
TP347H pipes are primarily used in:
1. Power plants (superheaters, reheaters)
2. Petrochemical plants (reactor vessels, heat exchangers)
3. Aerospace (engine components, exhaust systems)
4. High-temperature industrial applications
What are the key chemical components of TP347H?
The main alloying elements in TP347H are:
– Chromium (17.0-19.0%)
– Nickel (9.0-13.0%)
– Niobium (8*C-1.1%)
– Carbon (0.04-0.10%)
How does TP347H compare to standard 347 stainless steel?
TP347H has a higher carbon content (0.04-0.10%) compared to standard 347, which improves its strength and creep resistance at high temperatures. It also has better oxidation resistance due to its higher operating temperature capability (850°C vs 650°C).
What are the mechanical properties of TP347H?
TP347H has minimum mechanical properties of:
– Tensile Strength: 515 MPa
– Yield Strength: 205 MPa
– Elongation: 35%
– Hardness: 192 HB
What are the recommended welding methods for TP347H?
Recommended welding methods for TP347H include:
– Manual welding: AO 102, AO 107, AO 132 electrodes
– TIG welding: ER-347 wire
– For dissimilar metals: ENiCrFe-3 or ERNiCr-3
What are the temperature limits for TP347H?
TP347H can operate at:
– Maximum 650°C for pressure parts
– Maximum 850°C for oxidation resistance
– Generally used above 500°C where wet corrosion is not a concern
How does TP347H resist corrosion?
TP347H offers excellent resistance to:
– Organic acids at moderate temperatures
– Salt solutions (sulfates, sulfides, sulfites)
– Caustic environments at moderate temperatures
– Intergranular corrosion due to niobium stabilization
What quality control tests are performed on TP347H pipes?
Standard tests include:
– Chemical composition analysis
– Tensile testing
– Hardness testing
– Flattening test
– Flaring test
– NDT
– Surface inspection
– Dimensional check
What maintenance is required for TP347H pipes?
Regular maintenance should include:
– Inspection of high-temperature sections
– Monitoring for oxidation and scaling
– Proper cleaning procedures
– Temperature monitoring
– Regular NDT
This comprehensive guide provides detailed information about TP347H stainless steel pipes, covering their composition, properties, applications, and maintenance requirements. The content is structured to be easily digestible while providing in-depth technical information that would be valuable to engineers, procurement specialists, and industry professionals working with high-temperature applications.
