Products Description
ASTM A335 P22, also widely known as 2.25Cr-1Mo pipe or Chrome Moly P22 pipe, is a high-performance ferritic alloy steel seamless pipe specifically designed for elevated temperature and pressure service. This widely recognized specification covers both nominal and minimum wall thickness seamless ferritic Alloy Steel P22 Pipes.
Its unique composition, primarily defined by its chromium and molybdenum content, makes it indispensable for critical applications where extreme heat, corrosive environments, and high operational stresses are prevalent.
Pipes manufactured to ASTM A335 P22 / ASME SA335 P22 standards are inherently suitable for demanding operations such as bending, flanging (vanstoning), and various similar formation operations, as well as for fusion welding. This versatility, coupled with its superior metallurgical properties, ensures its reliability in complex piping systems.
The core strength of P22 material lies in its carefully controlled chemical composition, which bestows upon it exceptional high-temperature strength, excellent oxidation resistance, and remarkable creep resistance.
The addition of Molybdenum significantly enhances its creep strength, making it ideal for continuous high-temperature service up to 540-750°C. Chromium, on the other hand, contributes to its superior tensile, yield, and hardness properties even at room temperatures, alongside improved oxidation resistance.
Products Specifications
| Specification | Details |
|---|---|
| Standard | ASTM A335 / ASME SA335 |
| Grade | P22 (2.25Cr-1Mo) |
| UNS Number | K21590 |
| Trade Name | 2 ¼ Chrome Pipe, Chrome Moly P22 Pipe |
| Manufacturing Process | Seamless (Hot Finished or Cold Drawn) |
| Sizes (NPS) | ½" NB to 24" NB; Specialized in Large Diameter Sizes |
| Outer Dimensions (OD) | 19.05 mm – 114.3 mm (and larger as per NPS) |
| Wall Thickness (Schedule) | SCH 20, SCH 40, SCH STD, SCH 80, SCH XS, SCH 160, XXS (up to 250 mm thick) |
| Length | Single Random, Double Random, Cut to Length (up to max 16000 mm) |
| Ends | Plain End (PE), Beveled Ends (BE), Threaded |
| Surface Treatment | Polished, Varnished, 3PE Coating, FBE Coating |
| Pipe Form | Round, Rectangular, Square, Hydraulic, and other customized forms |
Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.05 - 0.15 |
| Manganese (Mn) | 0.30 - 0.60 |
| Phosphorus (P), max | 0.025 |
| Sulfur (S), max | 0.025 |
| Silicon (Si), max | 0.50 |
| Chromium (Cr) | 1.90 - 2.60 |
| Molybdenum (Mo) | 0.87 - 1.13 |
ASTM A335 P22 Pipe Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength, min | 60,000 psi (415 MPa) |
| Yield Strength, min | 30,000 psi (205 MPa) |
| Elongation (Longitudinal), min | 30% (for pipe thickness above 8mm) |
| Elongation (Transverse), min | 20% (for pipe thickness above 8mm) |
Applications of ASTM A335 P22 Alloy Steel Seamless Pipes
The exceptional high-temperature strength, creep resistance, and corrosion resistance of ASTM A335 P22 seamless pipes make them indispensable in a wide array of demanding industrial applications. These High Pressure Pipe solutions are particularly suited for environments involving elevated temperatures and pressures. Key applications include:
Power Generation: Widely used in thermal and nuclear power plants for steam lines, headers, and Boiler tube P22 applications, where high temperatures and pressures are encountered.
Petrochemical and Chemical Processing: Critical for transporting high-temperature and corrosive fluids in refineries, chemical plants, and processing units.
Oil and Gas Industry: Essential for off-shore oil drilling companies, gas processing facilities, and pipelines transporting heated hydrocarbons.
Heat Exchangers and Condensers: Employed in heat transfer systems where excellent thermal stability and corrosion resistance are required.
Pulp and Paper Industry: Used in various high-temperature processes within paper mills.
Pharmaceutical Equipment: Utilized in processes requiring sterility and resistance to chemical interactions at elevated temperatures.
Specialty Chemical Industries: For handling aggressive chemicals and processes at high temperatures.
Sea Water Equipment: Selected for certain components due to its enhanced corrosion resistance.
