Seamless Boiler Tube ASTM A335 P9 , Alloy Steel , Power Generation , Industrial Boiler
Grade A335 P9 is a specification for seamless ferritic alloy-steel pipe for high-temperature service. It is commonly used in applications that require high strength and resistance to oxidation and corrosion at elevated temperatures.
ASTM A335 P9 seamless boiler tubes are particularly effective in the power generation, petrochemical, chemical processing, industrial boiler, oil and gas, and marine industries. Their ability to withstand high temperatures and corrosive environments ensures long-term reliability and efficiency in demanding applications.
Chemical Composition:
Grade | Cr | Mo | C | Mn | P | S | Si | Ni | Fe |
A335 P9 | 8.0-10.0% | 0.9-1.10% | 0.15% maximum | 0.30-0.60% | ≤ 0.25% | ≤ 0.25% | 0.50% maximum | ≤ 0.4% | Balance |
Mechanical Properties:
Grade | Tensile Strength | Yield Strength | Elongation | Hardness |
A335 P9 | Minimum 415 MPa (60,200 psi) | Minimum 220 MPa (31,900 psi) | 30% minimum in 50 mm | ≤ 85 HRB (Rockwell Hardness B) |
Key Features:
- High-Temperature Strength: Excellent mechanical properties at elevated temperatures.
- Oxidation Resistance: Superior resistance to oxidation in high-temperature environments.
- Creep Resistance: High resistance to creep, making it suitable for long-term exposure to high temperatures.
- Durability: High tensile strength ensures durability in demanding applications.
- Weldability: Good weldability, allowing for easy fabrication and repair.
Applications:
1. Industrial Boilers
- Heating Systems: Utilized in industrial heating systems, including boilers and furnaces, where high-pressure steam or hot water is generated.
- Process Piping: Suitable for high-temperature process piping in various industrial applications.
- Superheaters: Used in superheater tubes exposed to high temperatures and pressures.
2. Power Generation Industry
- Boilers: Used in the construction of boilers for power plants, especially for high-pressure and high-temperature steam generation.
- Superheaters: Ideal for superheater tubes that need to withstand high temperatures and pressures.
- Steam Pipes: Utilized in steam piping systems that operate at high temperatures and pressures.
3. Chemical Processing Industry
- Reactors and Vessels: Ideal for reactors and pressure vessels exposed to high temperatures and aggressive chemicals.
- Piping Systems: Suitable for high-temperature and high-pressure piping systems transporting steam and hot fluids.
- Heat Recovery Systems: Used in heat recovery systems that utilize high-temperature steam.
