ASTM A312 TP347HFG Seamless Stainless Steel Pipe Tube
ASTM A312 TP347HFG Seamless Stainless Steel Pipe Tube
Products Specification
| Standard | ASTM A312 |
| Pipe Type | Bright Annealed Stainless Steel Tubing |
| Grades | 304, 304L, 316, 316L, 321, 310S, 2205, 2507,347,TP347HFG |
| Dimensions | Outer Diameter (OD): 10 mm to 610mm |
| Wall Thickness | 1mm to 50.0 mm |
| Length | Up to 12 meters (custom lengths available upon request) |
| Manufacturing Process | Cold Drawn, Bright Annealed, Seamless |
| Material Surface Finish | Bright Annealed (BA), Mirror Polished, Pickling |
| End Type | Plain End (PE), Beveled End (BE), Threaded End (TE) |
| Certifications | ISO 9001, EN 10204 3.1 |
TP347HFG Stainless Steel Pipe
1. Overview
TP347HFG is a high-temperature austenitic stainless steel designed for elevated-temperature service, particularly in power plants and petrochemical industries. It is a modified version of TP347H with fine grain (FG) structure, offering improved creep resistance and long-term durability under stress at high temperatures.
2. Chemical Composition (ASTM A213/A312)
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.06–0.10 |
| Manganese (Mn) | ≤2.00 |
| Silicon (Si) | ≤0.75 |
| Phosphorus (P) | ≤0.040 |
| Sulfur (S) | ≤0.030 |
| Chromium (Cr) | 17.0–20.0 |
| Nickel (Ni) | 9.0–13.0 |
| Niobium (Nb) | 8×C min – 1.00 |
| Iron (Fe) | Balance |
Key Notes:
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Niobium (Nb) stabilizes the alloy against sensitization and intergranular corrosion.
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Controlled carbon content enhances high-temperature strength.
3. Mechanical Properties
| Property | Value (Typical) |
|---|---|
| Tensile Strength (Room T) | ≥515 MPa (75 ksi) |
| Yield Strength (Room T) | ≥205 MPa (30 ksi) |
| Elongation (% in 50mm) | ≥35% |
| Hardness (Brinell) | ≤201 HB |
| Creep Strength (600°C) | Excellent |
High-Temperature Performance:
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Retains strength and oxidation resistance up to 800°C (1472°F).
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Superior creep rupture strength compared to standard TP347H.
4. Characteristics & Advantages
Key Features:
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Fine Grain Structure (FG): Enhances creep resistance and reduces crack propagation.
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Oxidation & Corrosion Resistance: Performs well in sulfur-rich and steam environments.
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Weldability: Suitable for welding with proper techniques (e.g., low heat input).
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Thermal Stability: Resists scaling and carburization in high-temperature service.
Advantages over TP347H:
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Longer service life in superheaters/reheaters (power boilers).
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Reduced risk of stress corrosion cracking (SCC).
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Better microstructural stability under cyclic heating.
5. Applications
TP347HFG is widely used in:
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Power Generation:
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Superheater/reheater tubes in coal-fired and biomass boilers.
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High-pressure steam pipelines (up to 620°C).
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Petrochemical Industry:
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Crackers, reformers, and furnace tubes.
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Oil & Gas:
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Exhaust systems and heat exchangers.
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Nuclear Plants:
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Secondary steam circuits.
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6. Standards & Certifications
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ASTM A213/A312: Seamless/welded pipes.
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ASME SA213/SA312: Pressure vessel compliance.
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EN 10216-5: European standard for high-temperature tubes.
Conclusion
TP347HFG stainless steel pipes are engineered for extreme heat and pressure, combining fine-grain metallurgy with superior creep resistance. Their reliability in power plants and corrosive environments makes them a premium choice for critical high-temperature applications.
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