A335 P91 Seamless Pipe

A335 P91 is a type of seamless pipe made from a high-performance alloy steel, designed specifically for high-temperature and high-pressure applications. It is part of the ASTM A335 standard, which covers seamless ferritic alloy-steel pipe for high-temperature service.

A335 P91 Seamless Pipe: Product Description
**1. Material Composition:

Alloy Steel: A335 P91 is a chromium-molybdenum-vanadium alloy steel that offers superior resistance to high temperatures and pressures.
Chemical Composition:
Carbon (C): 0.05-0.15%
Manganese (Mn): 0.30-0.60%
Silicon (Si): 0.50-0.80%
Chromium (Cr): 8.00-9.50%
Molybdenum (Mo): 0.90-1.20%
Vanadium (V): 0.15-0.25%
Others: Contains trace amounts of sulfur, phosphorus, and other elements as per ASTM specifications.
**2. Specifications:

Standard: ASTM A335
Grade: P91
Type: Seamless pipe
Size Range: Typically available from 1/2 inch to 24 inches in diameter, but custom sizes can be produced.
Wall Thickness: Available in various thicknesses, from Schedule 10 to Schedule 160, depending on application needs.
**3. Properties:

Temperature Resistance: Designed to handle temperatures up to approximately 700°C (1292°F), making it suitable for high-temperature service.
Mechanical Properties:
Tensile Strength: Minimum of 620 MPa (90,000 psi)
Yield Strength: Minimum of 415 MPa (60,000 psi)
Elongation: Typically around 20% in 50 mm (2 inches) for elongation.
Corrosion Resistance: Offers good resistance to oxidation and corrosion at high temperatures, ideal for severe service conditions.
**4. Applications:

Power Generation: Used in high-pressure and high-temperature environments such as superheaters, reheaters, and main steam lines in power plants.
Petrochemical Industry: Suitable for high-temperature applications in refining and chemical processing.
Oil and Gas: Used in critical components of oil and gas exploration and production where high-temperature performance is crucial.
**5. Manufacturing Process:

Production: Pipes are manufactured using seamless techniques, which include heating, piercing, and extruding the alloy to achieve the desired dimensions and properties.
Heat Treatment: Typically subjected to heat treatment processes such as normalizing, tempering, or stress relieving to achieve the desired mechanical properties.
**6. Standards & Certification:

Testing: Pipes undergo rigorous testing including hydrostatic tests, mechanical tests, and chemical composition tests to ensure compliance with ASTM A335 P91 standards.
Certification: Pipes come with mill test certificates and can be certified according to international standards or specific customer requirements.
**7. Delivery & Packaging:

Delivery Condition: Usually supplied in standard lengths, but custom lengths can be arranged based on project specifications.
Packaging: Typically bundled and wrapped in protective material, with custom packaging options available depending on customer needs.
**8. Additional Information:

Welding: Special care should be taken when welding P91 pipes due to their specific alloy composition. Preheat and post-weld heat treatment may be required.
Inspection: Includes thorough inspections such as visual, ultrasonic, and radiographic testing to ensure high quality and compliance with specifications.
If you need more detailed information or have specific requirements for A335 P91 seamless pipes, feel free to ask!