ASTM A335 P11 Seamless Alloy Steel Pipes (UNS K11597)
ASTM A335 P11 Pipes, manufactured from UNS K11597, are widely used chromium-molybdenum alloy steel seamless pipes offering excellent strength, creep resistance, and oxidation resistance in elevated temperature environments. P11 is one of the most commonly used grades in power plants, refineries, and petrochemical industries due to its balanced composition of chromium and molybdenum, providing long-term stability under high temperature and pressure.
P11 alloy steel pipes are suitable for superheaters, reheaters, steam pipelines, and high-temperature boiler tubes. With strong weldability, durability, and thermal stability, ASTM A335 P11 ensures reliable performance in continuous service environments where temperature cycles and pressure fluctuations are frequent.
Key Features
- Chromium-Molybdenum alloy steel seamless pipe
- Grade P11 with UNS K11597 designation
- Excellent high-temperature mechanical strength
- Strong resistance to creep and oxidation
- Good weldability and formability
- Suitable for steam, boiler, and refinery applications
- Available in hot-finished and cold-drawn forms
Equivalent Grades
| Standard | Grade / Material Number |
|---|---|
| ASTM | A335 P11 |
| ASME | SA335 P11 |
| UNS | K11597 |
| DIN | 13CrMo4-5 |
| EN | 13CrMo4-5 |
| BS | 3604 621-460 |
Available Sizes
- Outside Diameter (OD) Range: 1/2” to 36” DN25 to DN900
- Schedules Available: SCH 20, SCH 30, SCH 40, SCH 60, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160, and XXS
ASTM A335 P11 Chemical Composition
| Element | % |
|---|---|
| Carbon | 0.05 – 0.15 |
| Manganese | 0.30 – 0.60 |
| Phosphorus | 0.025 max |
| Sulfur | 0.025 max |
| Silicon | 0.50 – 1.00 |
| Chromium | 1.00 – 1.50 |
| Molybdenum | 0.44 – 0.65 |
Gr P11 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 415 MPa min |
| Yield Strength | 205 MPa min |
| Elongation | 30% min |
| Hardness | 85 HRB max |
Gr P11 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Thermal Conductivity | 42 W/m-K |
| Modulus of Elasticity | 200 GPa |
| Melting Point | 1425–1510°C |
| Specific Heat | 460 J/kg-K |
Type of ASTM A335 P11 Pipes
- Seamless Alloy Steel Pipes
- Hot Finished Seamless Pipes
- Cold Drawn Seamless Pipes
Applications
- Steam pipelines and boiler tubes
- Superheater and reheater tubes
- Heat exchangers
- Petrochemical refinery piping
- Power generation components
- High-pressure heater tubes
- Industrial furnace applications
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