ASTM A335 P9 Seamless Alloy Steel Pipes (UNS S50400)
ASTM A335 P9 Pipes, made from UNS S50400, are high-strength chromium-molybdenum (9Cr-1Mo) alloy steel seamless pipes used primarily in high-temperature and high-pressure environments. These pipes offer excellent creep resistance, high thermal stability, and long service life under extreme operating conditions. Their superior oxidation resistance, combined with strong structural integrity, makes them ideal for power plants, refineries, petrochemical units, and superheater boiler tubes.
P9 is widely used in thermal power plants due to its ability to withstand temperatures over 600°C. The 9% chromium content provides outstanding corrosion resistance against aggressive media, while molybdenum enhances strength and hardness at elevated temperatures. These seamless pipes ensure reliability where failure is not an option.
Key Features
- Chromium-Molybdenum alloy steel (9Cr-1Mo)
- Manufactured as per ASTM A335 standard
- UNS S50400 material designation
- Excellent high-temperature strength and creep resistance
- Strong resistance to oxidation and thermal fatigue
- Available in hot-finished and cold-drawn seamless forms
- Suitable for high-pressure piping and boiler applications
Equivalent Grades
| Standard | Grade / Material Number |
|---|---|
| ASTM | A335 P9 |
| ASME | SA335 P9 |
| UNS | S50400 |
| DIN | 10CrMo9-10 |
| EN | X10CrMo9-10 |
| BS | 3604 620-460 |
Available Sizes
- NPS (Nominal Pipe Size): 1/8″ to 36″ NB+
- OD (Outside Diameter): ~6 mm to >660 mm (0.23″ to >26″)
- Schedules (WT): Full range, including STD, SCH 40, SCH 80 (XS), SCH 160, and XXS
ASTM A335 P9 Chemical Composition
| Element | % |
|---|---|
| Carbon | 0.10 – 0.20 |
| Manganese | 0.30 – 0.60 |
| Phosphorus | 0.025 max |
| Sulfur | 0.025 max |
| Silicon | 0.20 – 1.00 |
| Chromium | 8.0 – 10.0 |
| Molybdenum | 0.90 – 1.10 |
ASTM A335 Gr P9 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 620 MPa min |
| Yield Strength | 275 MPa min |
| Elongation | 20% min |
| Hardness | 179 HB max |
Grade P9 Physical Properties
| Property | Value |
|---|---|
| Density | 7.85 g/cm³ |
| Thermal Conductivity | 33 W/m-K |
| Modulus of Elasticity | 200 GPa |
| Melting Point | 1425–1510°C |
| Specific Heat | 460 J/kg-K |
Type of ASTM A335 P9 Pipes
- Seamless Alloy Steel Pipes
- Hot Finished Pipes
- Cold Drawn Pipes
Applications
- Superheater tubes
- Heat exchanger piping
- High-temperature steam lines
- Power plant boiler components
- Petrochemical processing units
- Refinery heater tubes
- Industrial furnace parts
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