ASTM A335 / ASME SA335 Alloy Steel P11 Seamless Pipe for Boiler
A335 P11 seamless pipe typically undergoes a heat treatment process called normalization and tempering. This process helps improve the pipe's mechanical properties, such as strength and toughness, while reducing internal stresses. A335 P11 seamless pipe is often supplied with a protective coating or surface treatment to prevent corrosion during transportation and storage. Common surface treatments include varnish, oil coating, or painting. The seamless pipe offers good resistance to oxidation, which helps protect it from corrosive environments. However, it is important to note that it is not as corrosion-resistant as stainless steel.
Specifications of Alloy Steel Seamless Pipe
| Standard | ASTM A335, ASME SA335 |
| Grade | Gr. P5, P9, P11, P12, P21, P22 , P91 |
| Size | 1/2" TO 24 "IN OD & NB |
| Schedule | SCH 5- SCH XXS |
| Type | Seamless / Fabricated |
| Length | Single Random, Double Random & Cut Length |
| End | Plain End, Beveled End |
Chemical composition(%)
| Grade | C | Mn | P≤ | S≤ | Si | Cr | Mo |
| P11 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.50-1.00 | 1.00-1.50 | 0.44-0.65 |
| P22 | 0.05-0.16 | 0.30-0.60 | 0.025 | 0.025 | ≤0.50 | 1.90-2.60 | 0.87-1.13 |
| P5 | ≤0.15 | 0.30-0.60 | 0.025 | 0.025 | ≤0.50 | 4.00-6.00 | 0.45-0.65 |
| P9 | ≤0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.25-1.00 | 8.00-10.00 | 0.90-1.10 |
| P91 | 0.08-0.12 | 0.30-0.60 | 0.020/0.010 | 0.020/0.010 | 0.02-0.50 | 8.00-9.50 | 0.85-1.05 |
| P92 | 0.07-0.13 | 0.30-0.60 | 0.020/0.010 | 0.020/0.010 | ≤0.50 | 8.50-9.50 | 0.30-0.60 |
Mechanical properties
| Grade | Tensile strength | Yield strength | Elongation |
| P11, P22, P5, P9 | ≥415 | ≥205 | ≥30/20 |
| P91 | ≥585 | ≥415 | ≥20 |
| P92 | ≥620 | ≥440 | ≥20 |
Here are some key advantages and reasons for alloy pipes' usage:
1. High-temperature Resistance: A335 P11 tubes are specifically designed to withstand high temperatures, making them suitable for applications that involve elevated temperatures and pressures. They have good creep and rupture strength, allowing them to withstand prolonged exposure to high heat without significant deformation or failure.
2. Corrosion Resistance: These tubes are made with alloyed steel, which provides excellent resistance to corrosion and oxidation. This makes them suitable for use in environments that involve corrosive substances, such as oil, gas, and chemical industries.
3. Strength and Durability: A335 P11 tubes have high tensile strength and toughness, allowing them to withstand demanding operating conditions. Their robust construction ensures long-term performance, reducing the risk of leaks or failures.
4. Versatility: P11 tubes offer versatility in terms of application due to their compatibility with various processes and industries. They can be used in power plants, refineries, petrochemical industries, oil and gas sectors, and high-temperature applications.
5. Seamless Design: A335 P11 tubes are manufactured through a seamless production process, ensuring a consistent and uniform structure throughout the tube length. This makes them resistant to cracking and enhances their overall performance.
6. Cost-effectiveness: A335 P11 tubes provide a balance between performance and cost, making them a cost-effective choice for many applications. Their durability and resistance to corrosion reduce the need for frequent replacements or repairs, resulting in lower maintenance and operational costs over time.
Applications
Here are some common usages of A335 P11 seamless pipes:
1. Power Plants: A335 P11 pipes are widely used in power plants for various applications such as steam pipelines, superheater tubes, and reheater tubes. They can withstand high temperatures and pressures, making them suitable for power generation processes.
2. Petrochemical Refineries: P11 pipes find extensive use in petrochemical refineries for transporting various fluids, including oil, gas, and chemicals. They are commonly employed in pipelines, heat exchangers, and boilers within these facilities.
3. Oil and Gas Industries: A335 P11 pipes are utilized in the oil and gas industries for both upstream and downstream operations. They are used in exploration, production, and transportation of oil and gas, including applications such as drilling, extraction, and refining.
4. Boiler Applications: P11 pipes are commonly used in boilers due to their high-temperature resistance and corrosion resistance properties. They are employed in both industrial and commercial boilers for steam generation and heat transfer processes.
5. High-Temperature Applications: These pipes are suitable for various high-temperature applications across different industries. They are often used in environments where resistance to heat and pressure is critical, such as chemical processing plants, thermal power plants, and heat recovery steam generators (HRSGs).
6. Heat Exchangers: A335 P11 pipes are employed in heat exchangers to facilitate efficient heat transfer between two fluids at different temperatures. They provide excellent thermal conductivity and durability, making them suitable for this application.
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ASTM A335 Grade P11 / UNS K11597 Alloy Steel Seamless Pipe for Boiler Images
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