Description
Product Description A335 P11 Seamless Alloy Steel Pipe
ASTM A335 P11 is a high-performance seamless alloy steel pipe that has become a go-to choice for various industrial applications requiring superior mechanical properties, high-temperature resistance, and excellent corrosion resistance. This particular grade of pipe is commonly used in industries such as power generation, petrochemical, and refinery industries where pipes are subjected to extreme conditions, including high pressure and high temperature. This article provides an in-depth overview of A335 P11 seamless alloy steel pipes, their technical specifications, applications, and advantages.
Introduction to A335 P11 Seamless Alloy Steel Pipe
A335 P11 seamless alloy steel pipe is primarily used in the construction of boilers, heat exchangers, and other pressure vessels where resistance to high temperature and pressure is critical. The alloy content of A335 P11 ensures it performs excellently under conditions involving thermal cycling and varying mechanical stress. The material is also noted for its weldability and ease of fabrication, making it suitable for the fabrication of complex piping systems used in demanding environments.
ASTM A335 P11 Dimensional Specifications
A335 P11 seamless alloy steel pipes are available in a wide range of sizes and thicknesses, ensuring suitability for different application requirements. The pipes are typically produced in the following dimensions:
- Outside Diameter (OD): 10.3 mm to 914.4 mm
- Wall Thickness: 2 mm to 150 mm.
- Length: Custom lengths are available, with standard lengths ranging from 5 to 7 meters, 9 to 13 meters.
NPS (in) OD (in) SCH 10 (WT/ID) SCH 40 (WT/ID) SCH 80 (WT/ID) SCH 160 (WT/ID) SCH XXS (WT/ID)
1/8 0.405 0.049 / 0.307 0.068 / 0.269 0.095 / 0.215 0.123 / 0.159 0.215 / 0.215
1/4 0.540 0.065 / 0.410 0.088 / 0.364 0.119 / 0.302 0.157 / 0.226 0.302 / 0.302
1/2 0.840 0.083 / 0.674 0.109 / 0.622 0.147 / 0.546 0.187 / 0.466 0.294 / 0.294
3/4 1.050 0.083 / 0.884 0.113 / 0.824 0.154 / 0.742 0.218 / 0.614 0.308 / 0.434
1 1.315 0.109 / 1.097 0.133 / 1.049 0.179 / 0.957 0.250 / 0.815 0.358 / 0.599
1 1/4 1.660 0.109 / 1.442 0.140 / 1.380 0.191 / 1.278 0.250 / 1.160 0.382 / 0.896
1 1/2 1.900 0.109 / 1.682 0.145 / 1.610 0.200 / 1.500 0.281 / 1.338 0.400 / 1.100
2 2.375 0.109 / 2.157 0.154 / 2.067 0.218 / 1.939 0.344 / 1.687 0.436 / 1.503
3 3.500 0.120 / 3.260 0.216 / 3.068 0.300 / 2.900 0.438 / 2.624 0.600 / 2.300
4 4.500 0.120 / 4.260 0.237 / 4.026 0.337 / 3.826 0.531 / 3.438 0.674 / 3.152
6 6.625 0.134 / 6.357 0.280 / 6.065 0.432 / 5.761 0.719 / 5.187 0.864 / 4.897
8 8.625 0.148 / 8.329 0.322 / 7.981 0.500 / 7.625 0.906 / 6.813 1.125 / 6.375
10 10.750 0.165 / 10.420 0.365 / 10.020 0.500 / 9.750 1.250 / 8.250 1.406 / 7.938
12 12.750 0.180 / 12.390 0.375 / 12.000 0.500 / 11.750 1.406 / 9.938 1.562 / 9.625
ASTM GR P11 Equivalent Material
| Standard | Specification/Grade | Description |
|---|---|---|
| ASTM | A335 Gr. P11 | Seamless Ferritic Alloy Steel Pipe for High-Temperature Service |
| ASME | SA335 Gr. P11 | Seamless Ferritic Alloy Steel Pipe for High-Temperature Service |
| EN | 1.7335 (13CrMo4-5) | Alloy Steel, Creep-Resistant |
| DIN | 13CrMo4-5 | Alloy Steel for Pressure Purposes |
| BS | 3604 Grade 620-440 | Alloy Steel Pipes for High-Temperature Service |
| JIS | G3462 STBA22 | Alloy Steel Boiler and Heat Exchanger Tubes |
| GOST | 12ХМ | Low Alloy Steel Pipe |
| ISO | 9329-2 Grade 13CrMo4-5 | Seamless Steel Pipes for Pressure Applications |
| NF (France) | 13CrMo4-5 | High-Temperature Resistant Steel |
| UNI (Italy) | 13CrMo4-5 | Heat-Resistant Steel |
| GB (China) | 15CrMo | Alloy Structure Steel |
ASTM A335 P11 Chemical Composition
| Element | Composition (%) |
|---|---|
| Carbon (C) | 0.05 - 0.15 |
| Manganese (Mn) | 0.30 - 0.60 |
| Silicon (Si) | 0.50 - 1.00 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Chromium (Cr) | 1.00 - 1.50 |
| Molybdenum (Mo) | 0.44 - 0.65 |
ASTM A335 P11 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 415 MPa (60,200 psi) min |
| Yield Strength | 205 MPa (29,700 psi) min |
| Elongation | 30% 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) |
High-Temperature Resistance
One of the standout features of A335 P11 seamless alloy steel pipe is its ability to perform under high-temperature conditions. This material is designed to maintain its strength and mechanical integrity at temperatures ranging from 450°C to 550°C (840°F to 1020°F), which are common operating ranges for industrial systems such as boilers, heat exchangers, and superheaters. Its resistance to thermal degradation makes it ideal for heat-intensive environments where other materials might fail or degrade over time.
Corrosion Resistance
A335 P11 alloy steel pipe offers excellent resistance to oxidation and corrosion, particularly in high-temperature environments. The chromium content in the alloy provides enhanced protection against oxidation, while the addition of molybdenum ensures resistance to sulfur-containing compounds commonly found in industrial settings. This resistance to corrosion makes A335 P11 particularly suitable for use in power plants, chemical processing facilities, and petrochemical refineries.
Fabrication and Welding
The A335 P11 alloy steel is also known for its good weldability, which allows it to be easily fabricated into complex piping systems. Various welding processes, such as TIG (Tungsten Inert Gas), MIG (Metal Inert Gas), and SMAW (Shielded Metal Arc Welding), are suitable for welding A335 P11 pipes. When welding this material, preheating may be required to minimize the risk of cracking, especially for thicker pipes.
Post-weld heat treatment (PWHT) is also often necessary to relieve residual stresses and ensure the integrity of the weld joint. A typical post-weld heat treatment process involves heating the welded pipes to a temperature range of 700°C to 750°C (1292°F to 1382°F) and then cooling them at a controlled rate.
Applications
A335 P11 seamless alloy steel pipe is used in a variety of applications across multiple industries. Some of the most common applications include:
- Power Generation: A335 P11 pipes are commonly used in the construction of boilers, superheaters, and heat exchangers in power plants. These components must be able to handle high pressures and temperatures, which A335 P11 can withstand without compromising strength or integrity.
- Petrochemical Industry: In petrochemical refineries, A335 P11 is used to transport hot fluids and gases under pressure. Its corrosion resistance also helps it to resist the harsh chemicals that may be encountered in refineries.
- Chemical Processing: The material’s resistance to oxidation and its mechanical strength make it suitable for chemical reactors, distillation columns, and other processing equipment exposed to high-temperature and high-pressure conditions.
- Fossil Fuel Energy Production: A335 P11 pipes are essential in fossil fuel energy production, including gas and oil exploration and processing, where high temperature and pressure conditions prevail.
- Heat Exchangers and Condensers: The alloy steel’s thermal conductivity and resistance to thermal expansion make it an excellent choice for heat exchangers and condensers in various industrial sectors, ensuring efficient heat transfer and minimized risk of failure.
- Boiler Components: High-performance boilers that require resistant pipes capable of handling both internal and external stresses benefit greatly from A335 P11. This includes the production of the tubes that form the boiler’s heat transfer system.
Advantages
- High-Temperature Strength: With its ability to withstand temperatures up to 550°C, A335 P11 is ideal for applications involving heat cycles and thermal fluctuations.
- Corrosion and Oxidation Resistance: The material is resistant to corrosion and oxidation in high-temperature environments, making it ideal for use in chemical and power generation industries.
- Mechanical Strength: Its superior mechanical properties allow it to handle high-pressure and high-stress conditions with ease.
- Weldability and Fabrication: The material is easily weldable and can be formed into complex pipe systems to suit specific project requirements.
- Long Service Life: Due to its durability, A335 P11 has a long service life, which helps to reduce the cost of maintenance and replacement in industrial systems.
Standards and Certifications
A335 P11 seamless alloy steel pipe conforms to various standards, ensuring its quality and performance across industries:
- ASTM A335: This is the main standard that defines the requirements for seamless ferritic alloy steel pipe used in high-temperature service.
- ASME SA335: This standard also applies to A335 P11 and is commonly used in the design and manufacturing of pressure vessels.
- ISO 9001: The manufacturing process of A335 P11 often adheres to ISO 9001 standards for quality management systems.
- API 5L: In some cases, A335 P11 pipes may meet the requirements of the API 5L standard for pipelines used in the oil and gas industry.
Conclusion
A335 P11 seamless alloy steel pipe is a versatile and high-performance material suitable for a range of high-temperature, high-pressure applications in industries such as power generation, petrochemical processing, and chemical manufacturing. Its excellent mechanical properties, resistance to corrosion and oxidation, and good weldability make it an ideal choice for components exposed to severe environmental conditions.
Reviews
There are no reviews yet.