ASTM A369 Grade FPA Carbon Steel Pipes
ASTM A369 Grade FPA (UNS K11547) is a forged and bored seamless carbon steel pipe designed specifically for high-temperature and high-pressure service. These pipes are commonly used in boilers, superheaters, and heat exchangers where exceptional strength, thermal stability, and reliability are required.
Manufactured through forging and boring instead of traditional hot rolling, Grade FPA offers superior wall uniformity, high structural integrity, and enhanced performance in critical applications.
Key Features
- High-temperature carbon steel for pressure-bearing applications
- Manufactured using forging and boring for maximum strength
- Excellent resistance to thermal stress and pressure fluctuations
- Ideal for boilers, superheaters, reheaters, and high-pressure steam lines
- Seamless construction ensuring leak-proof performance
- Designed for long service life under harsh operating conditions
Equivalent Grades
| Standard |
Equivalent Grade |
| UNS |
K11547 |
| ASTM |
A369 Grade FPA |
| ASME |
SA369 Grade FPA |
| Material Type |
High-Temperature Carbon Steel |
Available Sizes
| Parameter |
Range |
| Outside Diameter |
50 mm – 650 mm (forged & bored capability) |
| Wall Thickness |
6 mm – 150 mm |
| Bore Size |
As per customer requirement |
| Length |
Up to 12 meters or custom cut |
| Ends |
Plain End / Bevelled End |
ASTM A369 FPA Chemical Composition
| Element |
Percentage (%) |
| Carbon (C) |
0.15 – 0.30 |
| Manganese (Mn) |
0.30 – 0.60 |
| Silicon (Si) |
0.10 – 0.35 |
| Phosphorus (P) |
≤ 0.035 |
| Sulfur (S) |
≤ 0.040 |
Grade FPA Mechanical Properties
| Property |
Value |
| Tensile Strength |
Min 415 MPa |
| Yield Strength |
Min 205 MPa |
| Elongation |
Min 30% |
| Stress Rupture Strength |
Suitable for high-temp service |
| Hardness |
As per ASTM A369 limits |
Grade FPA Physical Properties
| Property |
Value |
| Density |
7.85 g/cm³ |
| Thermal Conductivity |
Good |
| Melting Point |
~1450°C |
| Temperature Resistance |
Excellent under high heat & pressure |
| Modulus of Elasticity |
~200 GPa |
Type of Grade FPA Pipes
- Forged and Bored Carbon Steel Pipes
- Heavy Wall Carbon Steel Pipes
- Thick-Wall Seamless Pipes
- Boiler & Superheater Pipes
- Heat Exchanger Pipes
- Custom-Machined Bore Pipes
Applications
- High-Pressure Boilers
- Superheaters & Reheaters
- Petrochemical Process Heaters
- Steam Lines & Headers
- High-Temperature Pressure Systems
- Power Plant Piping
- Heat Exchanger Tube Shells
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