ASTM A335 P92 Seamless Ferritic Alloy Steel Pipe

ASTM A335 P92 is a specification for seamless ferritic alloy steel pipes, similar to P91 but with higher chromium and molybdenum content, offering improved creep strength at elevated temperatures.

Production Specification: ASTM A335 P92 specifies the requirements for seamless ferritic alloy steel pipe suitable for high-temperature service, particularly in power generation applications.

Material Specification: The material composition for ASTM A335 P92 includes alloying elements such as chromium, molybdenum, and sometimes vanadium.

Material Element Content: Typical chemical composition ranges for ASTM A335 P92 include:

Chromium: 8.50-9.50%

Molybdenum: 0.30-0.60%

Carbon: 0.07-0.13%

Manganese: 0.30-0.60%

Silicon: 0.20-0.50%

Phosphorus: 0.020% max

Sulfur: 0.010% max

Vanadium: 0.15-0.25%

Nitrogen: 0.03-0.07%

Mechanical Properties: ASTM A335 P92 pipes exhibit excellent mechanical properties, particularly creep strength, at elevated temperatures. Typical mechanical properties include:

Tensile Strength: 620 MPa (90 ksi) minimum

Yield Strength: 440 MPa (64 ksi) minimum

Elongation: 20% minimum

Hardness: 250 HBW maximum

Application Scope: ASTM A335 P92 pipes are used in high-temperature and high-pressure applications, such as steam pipelines, boiler tubes, superheater tubes, and heat exchanger tubes in power plants and petrochemical plants, where improved creep strength is required.

Manufacturing Process and Precautions: ASTM A335 P92 pipes are typically manufactured using the seamless hot-finished or cold-finished process. Similar to P91, special attention must be given to control the heat treatment process to ensure the desired microstructure and mechanical properties are achieved.

Commonly Supplied Specifications and Sizes: ASTM A335 P92 pipes are commonly supplied with specifications and sizes similar to P91:

Outer Diameter: 1/2" to 36"

Wall Thickness: SCH 20, SCH 40, SCH 80, SCH 160, SCH XS, SCH XXS

Length: Single Random, Double Random, Cut Lengths

End Finish: Plain End, Beveled End, Threaded

Common Q&A:

Q: What are the main differences between P91 and P92?

A: The main differences lie in their chemical composition, where P92 has higher chromium and molybdenum content compared to P91, offering improved creep strength at elevated temperatures.

Q: Can P92 be used interchangeably with P91?

A: While both specifications are suitable for high-temperature applications, P92 is typically chosen for its superior creep strength in more demanding conditions.

Q: Are there any special considerations when welding P92 pipes?

A: Yes, similar to P91, proper welding procedures and post-weld heat treatment are crucial to avoid issues like cracking and ensure the desired mechanical properties are maintained.

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