ASTM A369 FP11 Ferritic Alloy Steel Pipe (UNS K11597)
ASTM A369 FP11 Ferritic Alloy Steel Pipe (UNS K11597) is a high-temperature Cr-Mo alloy grade designed for boilers, superheaters, heat exchangers, and high-pressure piping. Manufactured via a forged and bored process, FP11 provides superior strength, dimensional precision, and excellent creep resistance. With its 1.25% Chromium and 0.5% Molybdenum content, this grade delivers long-term performance under elevated temperatures commonly encountered in power plants, refineries, and chemical industries.
Key Features
- Ferritic alloy steel with UNS K11597
- High-temperature strength and excellent creep resistance
- Forged & Bored construction ensures uniform wall thickness
- Superior oxidation resistance at elevated temperatures
- Ideal for pressure piping and thermal equipment
- Available in custom OD and heavy-wall configurations
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | A369 FP11 |
| ASME | SA369 FP11 |
| UNS | K11597 |
| EN / DIN | — |
Available Sizes
- Outer Diameter: 2” to 24”
- Wall Thickness: SCH 20 to SCH XXS
- Custom large OD and thick-wall sizes available
ASTM A369 FP11 Chemical Composition
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.05 – 0.15 |
| Manganese (Mn) | 0.30 – 0.60 |
| Phosphorus (P) | 0.025 max |
| Sulfur (S) | 0.025 max |
| Silicon (Si) | 0.50 max |
| Chromium (Cr) | 1.00 – 1.50 |
| Molybdenum (Mo) | 0.44 – 0.65 |
Grade FP11 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 415 MPa (min) |
| Yield Strength | 205 MPa (min) |
| Elongation | 20–30% (min) |
| Hardness | — |
Grade FP11 Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Melting Point | ~1425–1500°C |
| Thermal Conductivity | ~25–35 W/m·K |
| Modulus of Elasticity | 200 GPa |
Types Grade FP11 Pipes
- Forged & Bored Ferritic Alloy Steel Pipe
- High-Temperature Heavy Wall Pipe
- Seamless Power Plant Piping
- Custom Machined Alloy Steel Pipe
Applications
- Boilers
- Superheaters
- Heat Exchangers
- High-Pressure Steam Lines
- petrochemical Units
- Power Generation Plants
- Chemical Processing Piping
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