ASTM A312 TP347HFG Seamless Stainless Steel Pipe Tube

ASTM A312 TP347HFG Seamless Stainless Steel Pipe Tube

Products Specification

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)

Key Notes:

• Niobium (Nb) stabilizes the alloy against sensitization and intergranular corrosion.

• Controlled carbon content enhances high-temperature strength.

3. Mechanical Properties

High-Temperature Performance:

• Retains strength and oxidation resistance up to 800°C (1472°F).

• Superior creep rupture strength compared to standard TP347H.

4. Characteristics & Advantages

Key Features:

• Fine Grain Structure (FG): Enhances creep resistance and reduces crack propagation.

• Oxidation & Corrosion Resistance: Performs well in sulfur-rich and steam environments.

• Weldability: Suitable for welding with proper techniques (e.g., low heat input).

• Thermal Stability: Resists scaling and carburization in high-temperature service.

Advantages over TP347H:

• Longer service life in superheaters/reheaters (power boilers).

• Reduced risk of stress corrosion cracking (SCC).

• Better microstructural stability under cyclic heating.

5. Applications

TP347HFG is widely used in:

• Power Generation:

  • Superheater/reheater tubes in coal-fired and biomass boilers.

  • High-pressure steam pipelines (up to 620°C).

• Petrochemical Industry:

  • Crackers, reformers, and furnace tubes.

• Oil & Gas:

  • Exhaust systems and heat exchangers.

• Nuclear Plants:

  • Secondary steam circuits.

6. Standards & Certifications

• ASTM A213/A312: Seamless/welded pipes.

• ASME SA213/SA312: Pressure vessel compliance.

• 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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