What is the composition of P22 pipe
Jan 07, 2026
A335 P22 alloy steel pipe is a chromium-molybdenum high-temperature ferritic alloy steel pipe in the ASTM A335 standard, corresponding to the 12Cr2MoG material in the Chinese national standard GB5310. Its chemical composition contains 2.25% chromium and 1% molybdenum. This pipe is specifically designed for high-temperature and high-pressure environments, with an operating temperature up to 580℃ and a pressure ≥9.8 MPa. It is widely used in power plant boilers, superheaters and steam pipelines in the petrochemical industry, and high-pressure piping systems in nuclear power equipment.
chemical composition table for A335 P22:
| Element | Content Range (%) | Function Description |
|---|---|---|
| Carbon (C) | 0.05~0.14 | Increases strength and hardness |
| Manganese (Mn) | 0.30~0.60 | Enhances hardenability and strength |
| Phosphorus (P) | ≤0.025 | Controls impurities, prevents brittleness |
| Sulfur (S) | ≤0.025 | Controls impurities, prevents hot shortness |
| Silicon (Si) | ≤0.50 | Acts as a deoxidizer, improves strength |
| Chromium (Cr) | 1.90~2.60 | Enhances corrosion resistance and high-temperature strength |
| Molybdenum (Mo) | 0.87~1.13 | Improves high-temperature strength and creep resistance |
| Nickel (Ni) | ≤0.50 | Enhances toughness, improves weldability |
Features
Strong High Temperature Resistance: A335P22 seamless steel pipe maintains stable structural strength and good toughness in high-temperature environments, effectively preventing deformation and cracking, thus ensuring the safe operation of industrial equipment. It has a wide applicable temperature range, performing particularly well in high-temperature, high-pressure pipelines and equipment in the chemical, oil, and natural gas industries.
Excellent Corrosion Resistance: In corrosive gas or liquid environments, A335P22 seamless steel pipe exhibits excellent corrosion resistance, extending the service life of equipment.
Good Mechanical Properties: This steel pipe boasts high strength and good wear resistance, capable of withstanding heavy loads under high-temperature and high-pressure environments, ensuring long-term stable operation of equipment.
Superior Manufacturing Process: Manufactured using a seamless process, ensuring a smooth pipe wall and eliminating weld seams, thus improving the overall performance and service life of the steel pipe.
Excellent Manufacturing Process: Utilizing a seamless manufacturing process, it ensures a smooth pipe wall without weld seams or weak points, improving the overall performance and service life of the steel pipe.
Application Areas
Due to its unique performance characteristics, A335P22 seamless steel pipes are widely used in various industrial fields, including but not limited to the following:
- Power Industry: Used in key equipment such as boilers, heat exchangers, superheaters, and reheaters to ensure the stable operation of power and heat systems.
- Petroleum and Chemical Industry: Used in the manufacture of various reactors, heat exchangers, separators, and other equipment to withstand high temperatures, high pressures, and corrosive media.
- Shipbuilding Industry: A335P22 seamless steel pipes also play an important role in shipbuilding, especially in components requiring high temperature, high pressure, and corrosion resistance.
- Intelligent Manufacturing: With the development of intelligent manufacturing, A335P22 seamless steel pipes also have broad application prospects in the field of high-end equipment manufacturing.
A335 P22 Alloy steel pipe in stock
