ASTM A369 FP9 Carbon and Ferritic Alloy Steel Pipe (UNS K90941)
ASTM A369 FP9 Carbon and Ferritic Alloy Steel Pipe (UNS K90941) is a high-temperature grade developed for boilers, superheaters, pressure piping, and heat exchanger systems. Manufactured using a forged and bored process, FP9 pipes deliver outstanding strength, uniform wall thickness, and high resistance to creep deformation. With a chromium-molybdenum ferritic steel composition, FP9 provides excellent thermal stability and long-term performance in elevated-temperature industrial environments.
Key Features
- High-temperature ferritic alloy steel (UNS K90941)
- Forged & Bored pipe with excellent dimensional accuracy
- Exceptional creep resistance and oxidation resistance
- Stable mechanical strength at elevated temperatures
- Suitable for high-pressure & high-temperature applications
- Available in custom heavy-wall and large OD configurations
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | A369 FP9 |
| ASME | SA369 FP9 |
| UNS | K90941 |
| EN/DIN | — |
Available Sizes
-
Outer Diameter: 2” to 24”
-
Wall Thickness: SCH 20 to SCH XXS
-
Custom OD & heavy-wall thickness available
ASTM A369 FP9 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.15 max |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.50 max |
| Chromium (Cr) | 8.00 – 10.00 |
| Molybdenum (Mo) | 0.90 – 1.10 |
Grade FP9 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 585 MPa (min) |
| Yield Strength | 275 MPa (min) |
| Elongation | 20% (min) |
| Hardness | — |
Grade FP9 Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Melting Point | ~1425–1510°C |
| Thermal Conductivity | ~24–30 W/m·K |
| Modulus of Elasticity | 200 GPa |
Types Grade FP9 Pipes
- Forged & Bored Ferritic Alloy Steel Pipe
- Seamless Heavy-Wall Pipe
- High-Temperature Pressure Pipe
- Custom-Machined Industrial Pipe
Applications
- Boilers
- Superheaters
- Heat Exchangers
- High-Pressure Steam Lines
- Petrochemical & Refinery Units
- Power Generation Piping
- Chemical Processing Systems
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