ASTM A335 Gr. P9 Studded Fin Tubes for Cracking Furnaces
ASTM A335 Gr. P9 Studded Fin Tubes are designed for high-temperature heat transfer applications in cracking furnaces, where excellent resistance to oxidation, creep, and thermal fatigue is essential. Manufactured from 9Cr-1Mo alloy steel seamless tubes, these studded fin tubes provide an enlarged external heat transfer surface while maintaining outstanding mechanical integrity under prolonged exposure to elevated temperatures.
The welded studs significantly improve heat absorption from high-temperature flue gases, making the tubes suitable for convection sections of ethylene cracking furnaces, petrochemical heaters, and other demanding thermal processing equipment. ASTM A335 Gr. P9 offers superior high-temperature performance compared with conventional carbon steel materials, ensuring longer service life and improved operational reliability.
- Manufactured from ASTM A335 Gr. P9 seamless alloy steel tubes
- Excellent creep strength at elevated temperatures
- Superior oxidation and scaling resistance
- Enhanced heat transfer efficiency through welded studs
- Suitable for continuous high-temperature operation
- High structural stability under cyclic thermal loading
- Available in customized stud dimensions and tube configurations
- Manufactured according to ASME, ASTM, and customer specifications
ASTM A335 Gr. P9 Studded Fin Tubes are widely used in high-temperature industrial heating equipment, including:
- Ethylene Cracking Furnaces
- Petrochemical Fired Heaters
- Refinery Process Heaters
- Convection Sections of Process Furnaces
- Waste Heat Recovery Boilers
- Process Gas Heating Systems
- High-Temperature Heat Exchangers
- Steam Reforming Furnaces
- Hydrogen Production Units
- Chemical Processing Plants
| Parameter | Standard Range |
|---|---|
| Base Tube OD | 25.4–168.3 mm (1"–6") |
| Base Tube Wall Thickness | 2.77–12.70 mm |
| Tube Length | Up to 18,000 mm |
| Stud Diameter | 6–20 mm |
| Stud Height | 10–35 mm |
| Stud Pitch | 8–30 mm |
| Stud Material | Carbon Steel, Alloy Steel, Stainless Steel (according to application) |
| Manufacturing Standard | ASTM A335 / ASME SA335 / Customer Drawings |
| 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) | 0.25–1.00 |
| Chromium (Cr) | 8.00–10.00 |
| Molybdenum (Mo) | 0.90–1.10 |
| Property | Value |
|---|---|
| Tensile Strength | ≥ 415 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 20% |
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