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Alloy Steel A335 Gr.P9 Pipe, also known as ASTM A335 P9, is a seamless ferritic alloy steel pipe that contains chromium and molybdenum as strengthening elements. These pipes are specifically designed for high-temperature and high-pressure service conditions. With their superior strength and excellent thermal stability, they are widely used in critical applications where durability and reliability are paramount.
The chemical composition of Alloy Steel A335 Gr.P9 includes chromium, molybdenum, carbon, manganese, silicon, and trace elements that provide enhanced mechanical properties. These elements ensure excellent resistance to oxidation, creep, and corrosion under elevated temperatures. Manufactured under strict ASTM/ASME standards, A335 P9 pipes meet global quality benchmarks, making them a trusted choice for demanding industries.
The mechanical properties of A335 P9 make it suitable for heavy-duty, high-stress environments. It offers a minimum tensile strength of 415 MPa and a minimum yield strength of 205 MPa, with elongation values of around 30%. These properties ensure that the pipe retains its integrity even under fluctuating temperature and pressure conditions. Its excellent hardness and ductility make it reliable for long-term service.
A335 Gr.P9 pipes are manufactured using seamless hot finishing techniques followed by heat treatments such as normalizing, quenching, and tempering. This process refines the grain structure, enhances toughness, and ensures a uniform metallurgical composition throughout the pipe. The seamless construction eliminates the risk of leakage and weak points, making these pipes ideal for critical and high-pressure applications.
Alloy Steel A335 Gr.P9 Pipe offers outstanding mechanical strength, tensile capacity, and toughness at elevated service conditions. The presence of molybdenum improves strength and hardenability, while chromium enhances oxidation resistance and high-temperature stability. This combination makes P9 pipes suitable for prolonged exposure to extreme environments without compromising structural integrity.
Due to their robust design and high-performance capabilities, Alloy Steel A335 Gr.P9 Pipes are extensively used in boilers, superheaters, heat exchangers, power generation plants, oil refineries, and petrochemical plants. These pipes are ideal for transporting steam, oil, and gas in critical conditions where both strength and thermal resistance are required. Their adaptability and reliability make them indispensable in the energy and process industries.
The high chromium and molybdenum content provides A335 P9 pipes with superior resistance to corrosion, scaling, and oxidation at elevated temperatures. These pipes can withstand aggressive environments containing steam, hot gases, and chemical agents. Their excellent resistance to sulfidation and carburization also ensures dependable performance in thermal and petrochemical plants.
Alloy Steel A335 Gr.P9 pipes are extensively used in industries such as power generation, refineries, petrochemical processing, and chemical plants. They are ideal for use in superheater tubes, heat exchangers, boilers, reheater tubes, and steam pipelines. These pipes perform exceptionally well in systems where high temperature and pressure stability are essential for maintaining process efficiency and safety.
Specification
| Specification | Details |
|---|---|
| Product | Alloy Steel Seamless Pipe |
| Grade | A335 Grade P9 |
| Standard | ASTM A335 / ASME SA335 |
| Type | Seamless, Hot Finished / Cold Drawn |
| Material | Chromium-Molybdenum Alloy Steel (Cr-Mo) |
| Size Range | 1/2” NB to 36” NB (Nominal Bore) |
| Wall Thickness | Schedules 20, 40, 60, 80, 100, 120, 140, 160, XXS |
| End Finish | Plain End, Beveled End, Threaded |
| Form | Round, Hydraulic, Rectangular |
| Application | Boilers, Heat Exchangers, Power Plants, Petrochemicals, Refinery Service |
Chemical Composition (Typical ranges for SSS32760)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.15 max |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.25 – 1.00 |
| Chromium (Cr) | 8.00 – 10.00 |
| Molybdenum (Mo) | 0.90 – 1.10 |
Mechanical Properties (Typical)
| Property | Value |
|---|---|
| Tensile Strength, min | 415 MPa (60,000 psi) |
| Yield Strength, min | 205 MPa (30,000 psi) |
| Elongation, min | 30% |
| Hardness, max | HB 163 |
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM / ASME | A335 / SA335 Gr.P9 |
| EN | 10CrMo9-10 |
| DIN | 10CrMo9-10 |
| BS | 620-490 |
| AFNOR | 10CD9-10 |
| JIS | STBA 26 |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Nominal Pipe Size (NPS) | Outside Diameter (OD) mm | Wall Thickness (mm) | Weight (kg/m) |
|---|---|---|---|
| 1/2" | 21.3 | 2.77 | 1.27 |
| 3/4" | 26.7 | 2.87 | 1.68 |
| 1" | 33.4 | 3.38 | 2.47 |
| 1 1/4" | 42.2 | 3.56 | 3.38 |
| 1 1/2" | 48.3 | 3.68 | 4.05 |
| 2" | 60.3 | 3.91 | 5.44 |
| 3" | 88.9 | 5.49 | 11.29 |
| 4" | 114.3 | 6.02 | 15.77 |
| 6" | 168.3 | 7.11 | 28.26 |
| 8" | 219.1 | 8.18 | 43.39 |
| 10" | 273.0 | 9.27 | 67.53 |
| 12" | 323.8 | 9.53 | 84.17 |
Types Of Alloy Steel A335 Gr.P9 Pipes and Tubes
SS S32760 Seamless Pipe
SS S32760 Welded Pipe
SS S32760 ERW Pipe
SS S32760S EFW Pipe
Low Temperature Carbon Steel A333S Seamless Tube
S32760H Super Duplex Steel Welded Tube
S32760 Super Duplex Steel Capillary Tube
S32760H Super Duplex Steel Heat Exchanger Tubes
Frequently Asked Questions (FAQ)
Q1. What is Alloy Steel A335 Gr.P9 Pipe?
A335 Grade P9 is a seamless ferritic alloy-steel pipe made of chromium-molybdenum (Cr-Mo) alloy, designed for high-temperature and high-pressure service such as boilers, heat exchangers, and power plants.
Q2. What are the key chemical elements in A335 P9 pipes?
The main alloying elements are Chromium (8.00–10.00%), Molybdenum (0.90–1.10%), with controlled levels of Carbon, Manganese, Silicon, Phosphorus, and Sulfur.
Q3. What is the mechanical strength of A335 Gr.P9 pipe?
The pipes offer a minimum tensile strength of 415 MPa, yield strength of 205 MPa, and minimum elongation of 30%.
Q4. Where are A335 P9 pipes commonly used?
They are widely used in high-temperature applications such as power generation, petrochemical industries, refineries, boilers, and heat exchangers.
Q5. What sizes and forms are available in A335 Gr.P9?
Pipes are available from 1/2” NB to 36” NB in schedules ranging from Sch 20 to XXS, with end finishes like plain end, beveled end, or threaded.
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