ASTM A369 FP12 Wrought Ferritic Alloy Steel Pipe (UNS K11755)
ASTM A369 FP12 (UNS K11755) Wrought Ferritic Alloy Steel Pipe is a chromium-molybdenum (Cr-Mo) alloy grade designed for forged and bored high-temperature heavy-wall piping applications. FP12 provides excellent oxidation resistance, long-term creep strength, and enhanced thermal stability, making it ideal for boilers, pressure vessels, superheaters, and power generation environments. The combination of Chromium, Molybdenum, and Silicon ensures superior performance in high-temperature, high-pressure service conditions for extended operational life.
Key Features
- Ferritic Cr-Mo alloy steel grade (UNS K11755)
- Designed for forged & bored heavy-wall pipes
- Excellent high-temperature strength and oxidation resistance
- Superior resistance to creep and thermal fatigue
- Ideal for boilers, power plants, and high-pressure systems
- Available in a wide range of OD and heavy-wall sizes
Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| ASTM | A369 FP12 |
| ASME | SA369 FP12 |
| UNS | K11755 |
| EN/DIN | — |
Available Sizes
-
Outer Diameter: 2” – 24”
-
Wall Thickness: SCH 20 – SCH XXS
-
Custom heavy-wall & large-diameter pipes available
ASTM A369 FP12 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 – 1.00 |
| Chromium (Cr) | 0.80 – 1.25 |
| Molybdenum (Mo) | 0.44 – 0.65 |
Grade FP12 Mechanical Properties
| Property | Value |
|---|---|
| Tensile Strength | 415 MPa (min) |
| Yield Strength | 205 MPa (min) |
| Elongation | 20–30% (min) |
| Hardness | — |
Grade FP12 Physical Properties
| Property | Value |
|---|---|
| Density | 7.80 g/cm³ |
| Melting Point | ~1420–1500°C |
| Thermal Conductivity | 24–30 W/m·K |
| Modulus of Elasticity | 200 GPa |
Type of Grade FP12 Pipes
- Forged & Bored Ferritic Alloy Steel Pipe
- Heavy Wall High-Temperature Pipe
- Seamless Industrial Pressure Pipe
- Custom Machined Cr-Mo Alloy Steel Pipe
Applications
- Boilers
- Superheaters
- Pressure Vessels
- Power Generation Plants
- Heat Exchangers
- High-Pressure & High-Temperature Piping
- Petrochemical Processing Units
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