ASTM A335 P1 P2 P5 P9 P11 Ferritic Alloy Seamless Steel Pipe For High-Temperature Service
Material
ASTM A335 is a specification for seamless ferritic alloy steel pipes intended for high-temperature service. These pipes are designed to withstand high pressures and temperatures, making them suitable for various industrial applications, particularly in the power generation and petrochemical sectors.
Specification
The ASTM A335 specification covers several grades of ferritic alloy steel pipes, including P1, P2, P5, P9, and P11. Each grade has specific chemical and mechanical properties that make it suitable for different applications.
Key Features
- High-Temperature Resistance: Designed to perform under high temperatures.
- Seamless Construction: Provides superior strength and reliability.
- Corrosion Resistance: Enhanced resistance to oxidation and corrosion.
- Versatile Applications: Suitable for various industries, including oil and gas, power generation, and chemical processing.
Chemical Composition
The following table outlines the chemical composition of the ASTM A335 grades:
| Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Chromium (Cr) | Molybdenum (Mo) | Nickel (Ni) |
| P1 | 0.10 max | 0.30-0.60 | 0.025 max | 0.025 max | 0.40-0.65 | - | - |
| P2 | 0.10 max | 0.30-0.60 | 0.025 max | 0.025 max | 0.40-0.65 | 0.15-0.25 | - |
| P5 | 0.05-0.15 | 0.30-0.60 | 0.025 max | 0.025 max | 0.40-0.65 | 0.15-0.30 | - |
| P9 | 0.05-0.15 | 0.30-0.60 | 0.025 max | 0.025 max | 8.00-9.50 | 0.85-1.05 | - |
| P11 | 0.05-0.15 | 0.30-0.60 | 0.025 max | 0.025 max | 0.40-0.65 | 0.40-0.60 | 0.30-0.60 |
Mechanical Properties
The following table summarizes the mechanical properties of the ASTM A335 grades:
| Grade | Yield Strength (ksi) | Tensile Strength (ksi) | Elongation (%) | Hardness (HB) |
| P1 | 30 | 60-80 | 30 | 160-190 |
| P2 | 30 | 60-80 | 30 | 160-190 |
| P5 | 30 | 60-80 | 30 | 160-190 |
| P9 | 40 | 70-90 | 20 | 200-230 |
| P11 | 40 | 70-90 | 20 | 200-230 |
Steel Grade
The ASTM A335 specification includes the following steel grades:
- P1: Low alloy steel, suitable for high-temperature service.
- P2: Similar to P1 but with additional molybdenum for improved strength.
- P5: Contains chromium and molybdenum, offering enhanced high-temperature performance.
- P9: High chromium content for superior oxidation resistance.
- P11: Contains chromium and molybdenum, providing excellent strength and corrosion resistance.
Application
ASTM A335 pipes are widely used in:
- Power Generation: Steam boilers, turbines, and heat exchangers.
- Petrochemical Industry: Refineries and chemical processing plants.
- Oil and Gas: High-pressure pipelines and equipment.
- Industrial Applications: Various high-temperature applications.
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