ASTM A335 P22 Seamless Ferritic Alloy Steel Pipe

ASTM A335 P22 is a seamless ferritic alloy steel pipe specification commonly used in high-temperature applications such as power plants and petrochemical plants. 

Production Specification: ASTM A335 P22 specifies the requirements for seamless ferritic alloy steel pipe suitable for high-temperature service.

Material Specification: The material composition for ASTM A335 P22 includes alloying elements such as chromium, molybdenum, and sometimes vanadium.

Material Element Content: Typical chemical composition ranges for ASTM A335 P22 include:

Chromium: 2.00-2.50%

Molybdenum: 0.87-1.13%

Carbon: 0.05-0.15%

Manganese: 0.30-0.60%

Silicon: 0.50% max

Phosphorus: 0.025% max

Sulfur: 0.025% max

Mechanical Properties: ASTM A335 P22 pipes exhibit excellent mechanical properties even at elevated temperatures. Typical mechanical properties include:

Tensile Strength: 415-585 MPa (60-85 ksi)

Yield Strength: 205 MPa (30 ksi) minimum

Elongation: 30% minimum

Hardness: Not specified

Application Scope: ASTM A335 P22 pipes are used in high-temperature applications such as steam pipelines, boiler tubes, superheater tubes, and heat exchanger tubes in power plants and petrochemical plants.

Manufacturing Process and Precautions: ASTM A335 P22 pipes are typically manufactured using seamless hot-finished or cold-finished process. It's crucial to control the temperature and cooling rate during manufacturing to ensure proper grain structure and mechanical properties.

Commonly Supplied Specifications and Sizes: ASTM A335 P22 pipes are commonly supplied with the following specifications and sizes:

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

It's important to note that adherence to ASTM A335 P22 specifications is critical to ensure the integrity and performance of the alloy steel pipes in high-temperature applications. Compliance with material composition, mechanical properties, and manufacturing processes is essential for reliability and safety.

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