A335 P2 Seamless Pipe

AttributeDetails
Product NameA335 P2 Seamless Pipe
MaterialAlloy Steel
SpecificationsASTM A335 / ASME SA335
GradeP2
TypeSeamless
Size Range1/2" NB to 24" NB
Wall ThicknessSCH 40, SCH 80, SCH 160, SCH XXS
LengthSingle Random, Double Random, or Custom Length
CertificationISO 9001, API 5L, CE
Categories: ,

Description

Product Description A335 P2 Seamless Pipe

ASTM A335 P2 specifies seamless ferritic alloy steel pipes for high-temperature operation. . This specification is widely used in power plants, petrochemical industries, and refineries, where pipes must withstand high-pressure and high-temperature conditions. A335 P2 pipes have a specific chemical composition that includes molybdenum and chromium, offering excellent mechanical properties and corrosion resistance. These properties make them suitable for extreme environments, ensuring longevity and efficiency.

Key Features of ASTM A335 P2 Seamless Alloy Steel Pipe

  1. High-Temperature Resistance:
    • Designed for applications involving elevated temperatures.
    • Retains strength and performance under extreme thermal conditions.
  2. Corrosion Resistance:
    • Exhibits excellent resistance to oxidation and corrosion.
    • Suitable for harsh environments, including acidic and alkaline media.
  3. Mechanical Strength:
    • High tensile and yield strength.
    • Exceptional hardness and elongation properties.
  4. Versatility:
    • Suitable for bending, flanging, and other forming operations.
    • Facilitates welding for various fabrication needs.
  5. Durability:
    • Long service life, reducing maintenance costs.

A335 P2 Seamless Alloy Steel Pipe Dimensions

NPS (in)OD (in)SCH 10 (WT/ID)SCH 40 (WT/ID)SCH 80 (WT/ID)SCH 160 (WT/ID)SCH XXS (WT/ID)
1/80.4050.049 / 0.3070.068 / 0.2690.095 / 0.2150.123 / 0.1590.215 / 0.215
1/40.5400.065 / 0.4100.088 / 0.3640.119 / 0.3020.157 / 0.2260.302 / 0.302
1/20.8400.083 / 0.6740.109 / 0.6220.147 / 0.5460.187 / 0.4660.294 / 0.294
3/41.0500.083 / 0.8840.113 / 0.8240.154 / 0.7420.218 / 0.6140.308 / 0.434
11.3150.109 / 1.0970.133 / 1.0490.179 / 0.9570.250 / 0.8150.358 / 0.599
1 1/41.6600.109 / 1.4420.140 / 1.3800.191 / 1.2780.250 / 1.1600.382 / 0.896
1 1/21.9000.109 / 1.6820.145 / 1.6100.200 / 1.5000.281 / 1.3380.400 / 1.100
22.3750.109 / 2.1570.154 / 2.0670.218 / 1.9390.344 / 1.6870.436 / 1.503
33.5000.120 / 3.2600.216 / 3.0680.300 / 2.9000.438 / 2.6240.600 / 2.300
44.5000.120 / 4.2600.237 / 4.0260.337 / 3.8260.531 / 3.4380.674 / 3.152
66.6250.134 / 6.3570.280 / 6.0650.432 / 5.7610.719 / 5.1870.864 / 4.897
88.6250.148 / 8.3290.322 / 7.9810.500 / 7.6250.906 / 6.8131.125 / 6.375
1010.7500.165 / 10.4200.365 / 10.0200.500 / 9.7501.250 / 8.2501.406 / 7.938
1212.7500.180 / 12.3900.375 / 12.0000.500 / 11.7501.406 / 9.9381.562 / 9.625

A335 P2 Chemical Composition

ElementComposition (%)
Carbon (C)0.10 max
Manganese (Mn)0.30 - 0.61
Silicon (Si)0.13 - 0.32
Phosphorus (P)0.025 max
Sulfur (S)0.025 max
Chromium (Cr)0.44 - 0.65
Molybdenum (Mo)0.44 - 0.65

A335 P2 Mechanical Properties

PropertyValue
Tensile Strength415 MPa (60,200 psi) min
Yield Strength205 MPa (29,700 psi) min
Elongation30% min
Hardness (Brinell)163 HB max
Hardness (Rockwell B)85 HRB max
Impact Energy (Charpy V-Notch)27 J (20 ft-lbf) min at -20°C (-4°F)

Manufacturing Process

  1. Raw Material Selection:
    • High-quality alloy steel billets are chosen as the base material.
    • Strict quality control is maintained to ensure chemical composition adherence.
  2. Seamless Pipe Formation:
    • The seamless process involves heating the billet and piercing it to form a hollow shell.
    • The shell is then elongated and shaped into the desired dimensions.
  3. Heat Treatment:
    • Pipes are subjected to annealing, normalizing, or quenching to enhance mechanical properties.
  4. Testing:
    • Rigorous testing, including hydrostatic testing, non-destructive evaluation, and dimensional checks, ensures product quality.
  5. Finishing:
    • Final processes like surface treatment, marking, and packing are conducted to prepare the pipes for delivery.

Applications of ASTM A335 P2 Seamless Pipes

Due to their robust properties, ASTM A335 P2 pipes are employed in various industries, including:

  1. Power Plants:
    • Used in steam pipelines and boiler components due to their ability to withstand high pressure and temperature.
  2. Petrochemical Industry:
    • Ideal for transporting aggressive chemicals and gases.
  3. Oil and Gas:
    • Utilized in refineries for distillation columns and heat exchangers.
  4. Fertilizer Plants:
    • Transporting high-temperature fluids and gases.
  5. Aerospace and Defense:
    • Applied in specialized equipment requiring high strength and corrosion resistance.

Testing and Quality Assurance

To ensure the highest quality, ASTM A335 P2 pipes undergo stringent testing procedures, including:

  1. Hydrostatic Testing:
    • Ensures pipes can withstand internal pressure without leaking or deforming.
  2. Ultrasonic Testing:
    • Detects internal flaws such as cracks or inclusions.
  3. Tensile Testing:
    • Measures tensile and yield strength to ensure compliance with specifications.
  4. Chemical Analysis:
    • Verifies the chemical composition to match the ASTM standards.
  5. Dimensional Inspection:
    • Confirms the pipe dimensions are within tolerances.
  6. Impact Testing:
    • Assesses the pipe’s ability to endure sudden impact at varying temperatures.

Advantages of Using ASTM A335 P2 Alloy Steel Pipe

  1. Efficiency:
    • Enhanced heat resistance ensures efficient energy use in thermal systems.
  2. Reliability:
    • High mechanical strength offers reliability under extreme conditions.
  3. Cost-Effective:
    • Long service life reduces operational and maintenance costs.
  4. Sustainability:
    • Resistant to wear and corrosion, minimizing material wastage and replacements.
  5. Customizability:
    • Available in various sizes, lengths, and thicknesses to suit specific needs.

Standards and Certifications

ASTM A335 P2 seamless pipes comply with the following standards:

  • ASTM Standards: Ensures product quality and performance.
  • ISO Certification: Guarantees adherence to global manufacturing practices.
  • ASME Compliance: Meets the requirements for boiler and pressure vessel applications.
  • EN Standards: Confirms conformity with European regulations.

Welding and Fabrication

ASTM A335 P2 pipes are weldable with proper techniques, such as:

  1. Preheating:
    • Reduces thermal stress and prevents cracking during welding.
  2. Post-Weld Heat Treatment (PWHT):
    • Restores mechanical properties and removes residual stresses.
  3. Welding Methods:
    • Suitable for TIG, MIG, and SMAW processes.
  4. Formability:
    • Excellent bending and flanging characteristics facilitate fabrication.

Maintenance and Handling

  1. Inspection:
    • Regularly check for signs of corrosion, wear, or mechanical damage.
  2. Storage:
    • Store in a clean, dry environment to prevent oxidation.
  3. Cleaning:
    • Use suitable cleaning agents to remove deposits and contaminants.
  4. Repairs:
    • Employ appropriate repair techniques for minor defects to extend service life.

Conclusion

ASTM A335 P2 seamless alloy steel pipes are indispensable in industries requiring reliable performance under high-temperature and high-pressure conditions. Their superior mechanical qualities, corrosion resistance, and adaptability make them the preferable material for important applications. By adhering to stringent manufacturing and quality standards, A335 P2 pipes ensure longevity and cost-effectiveness, contributing to the efficiency and safety of industrial operations.

 

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