ASTM A335 P1 Alloy Steel Seamless Pipes (UNS K11522)
ASTM A335 P1 Seamless Pipes are chromium-molybdenum alloy steel pipes widely used for high-temperature and high-pressure service. Manufactured from UNS K11522, these pipes deliver excellent strength, thermal stability, and long-term durability in elevated temperature environments. Their superior performance in boilers, heat exchangers, pressure vessels, and power plants makes them a preferred choice for critical engineering applications.
These pipes offer enhanced creep resistance, excellent hardness retention, and good oxidation resistance, ensuring reliability in continuous service. ASTM A335 P1 pipes are supplied in hot-finished or cold-drawn conditions with strict dimensional accuracy and corrosion resistance.
Key Features
- Suitable for high-temperature and high-pressure service
- Manufactured from Cr-Mo alloy steel
- Excellent mechanical strength and durability
- Superior resistance to oxidation and corrosion
- Seamless construction for reliable fluid handling
- Ideal for boilers, heat exchangers, and power plant piping
Equivalent Grades
| Standard | Grade |
|---|---|
| UNS | K11522 |
| EN | 1.5415 (Similar) |
| DIN | 15Mo3 (Similar) |
| JIS | STPA 12 |
Available Sizes
- Outside Diameter: 10.3 mm to 660 mm
- Wall Thickness: 2 mm to 60 mm
- Lengths: Up to 12 meters or custom cut
ASTM A335 P1 Chemical Composition
| Element | Percentage (%) |
|---|---|
| Carbon (C) | 0.10 max |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.10 – 0.50 |
| Chromium (Cr) | 0.44 – 0.65 |
| Molybdenum (Mo) | 0.44 – 0.65 |
Gr P1 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 380 MPa (min) |
| Yield Strength | 205 MPa (min) |
| Elongation | 30% (min) |
| Hardness | 163 HB max |
Gr P1 Physical Properties
| Property | Value |
|---|---|
| Modulus of Elasticity | 205 GPa |
| Thermal Conductivity | 45 W/m-K |
| Density | 7.85 g/cm³ |
| Melting Point | ~1425°C |
Types of ASTM A335 P1 Pipes
- Seamless Hot Rolled P1 Pipes
- Seamless Cold Drawn P1 Pipes
- Heat Treated P1 Pipes
- Boiler & Superheater P1 Pipes
- Thick Wall P1 Seamless Pipes
Applications
- Power Generation Plants
- Steam Boilers and Superheaters
- Petrochemical Processing
- Refinery Units
- Heat Exchangers
- Oil and Gas Transmission
- Pressure Vessels and High-Temperature Lines
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