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Serrated Finned Tube A335 P11 for Boiler & Heat Recovery
Serrated Finned Tube A335 P11 for Boiler & Heat Recovery
Serrated Finned Tube A335 P11 for Boiler & Heat Recovery
Serrated Finned Tube A335 P11 for Boiler & Heat Recovery
Serrated Finned Tube A335 P11 for Boiler & Heat Recovery
Serrated Finned Tube A335 P11 for Boiler & Heat Recovery
Serrated Finned Tube A335 P11 for Boiler & Heat Recovery
Serrated Finned Tube A335 P11 for Boiler & Heat Recovery
Specifications
Certification :
ISO9001:2015; ISO14001:2015; ISO45001:2018; PED 2014/68/EU;
Model Number :
Serrated Finned Tube
Outer Diameter (Base Tube) :
25.4 mm – 168.3 mm (or custom)
Place of Origin :
CHINA
Brand Name :
YUHONG
MOQ :
10PCS
Supply Ability :
1000 tons per month
Delivery Time :
Depends on quantity
Fin Height :
10 mm – 25 mm
Base Tube Material :
ASTM A335 P11
Fin Material :
GR.11
Price :
Negotiable
Application :
Heat exchanger, boiler economizer, waste heat recovery
Payment Terms :
L/C,T/T
Fin Type :
Serrated
Packaging Details :
IRON FRAME WOODEN CASE
Welding Process :
High-frequency resistance welding (HFW)
Description
High Frequency Welded Serrated Fin Tubes (Base Tube: ASTM A335 P11 + Fins GR.11) – HFW Helical Serrated Finned Tubes for Superior Heat Transfer EfficiencyProduct Overview

Our High Frequency Welded (HFW) Serrated Fin Tubes, manufactured with ASTM A335 P11 seamless alloy steel base tubes and GR.11 serrated fins, provide exceptional performance in high-temperature, high-pressure heat exchange applications. The high-frequency resistance welding process creates a continuous, strong metallurgical bond between the helical serrated fins and the base tube. The serrated (segmented) fin design significantly enhances air-side turbulence, breaking the boundary layer and delivering superior convective heat transfer compared to solid fins. These robust tubes are engineered for demanding environments such as boilers, HRSG, and process heaters where reliability, efficiency, and long service life are critical.

Product Material Specifications

Base Tube: ASTM A335 P11 (Seamless Ferritic Alloy Steel for High-Temperature Service)

Fins: GR.11 (alloy-compatible material optimized for high-frequency welding and thermal performance)

Chemical Composition – Base Tube (ASTM A335 P11)

Element
Composition (%)
Carbon (C)
0.05 – 0.15
Manganese (Mn)
0.30 – 0.60
Phosphorus (P)
≤ 0.025
Sulfur (S)
≤ 0.025
Silicon (Si)
0.50 – 1.00
Chromium (Cr)
1.00 – 1.50
Molybdenum (Mo)
0.44 – 0.65


Mechanical Properties (Typical for P11):
  • Minimum Tensile Strength: 415 MPa
  • Minimum Yield Strength: 205 MPa
  • Elongation: ≥ 20%
GR.11 fin material is selected for excellent weldability with the P11 base, high thermal conductivity, and compatibility in high-temperature oxidizing environments.Fin Tube Structure and Manufacturing Process (High Frequency Welded)


  • Base Tube: Seamless ASTM A335 P11 alloy steel tube, offering outstanding creep strength, oxidation resistance, and pressure integrity at elevated temperatures.
  • Fins: Helical serrated (V- or U-shaped notches) GR.11 fins. Serrations create turbulence in the cross-flow, dramatically improving the heat transfer coefficient on the gas/air side.
  • High Frequency Welding Process: The fin strip is first serrated, then helically wound around the rotating base tube under pressure. High-frequency electric resistance welding (typically 200–500 kHz) rapidly heats the interface to forge a continuous metallurgical bond without filler metal. This results in a clean, strong weld with minimal heat-affected zone, excellent thermal contact, and high resistance to vibration and thermal cycling.
The HFW process ensures a robust fin-to-tube attachment suitable for continuous operation in severe industrial conditions.Dimensions and Tolerances

We offer a wide range of customizable sizes. Typical specifications include:


  • Base Tube OD: 21 mm to 273 mm (commonly 25 mm – 219 mm)
  • Tube Wall Thickness: 2.0 mm to 30 mm (according to schedule)
  • Fin Height: 6.35 mm to 38 mm
  • Fin Thickness: 0.8 mm to 3.0 mm (before serration)
  • Fin Density: 1 to 8 FPI (fins per inch) / 3 to 333 fins per meter
  • Tube Length: Up to 26–28 meters
Dimensional Tolerances (per industry standards for HFW finned tubes):
  • Base Tube OD: ±0.5 mm or tighter
  • Wall Thickness: ±12.5%
  • Fin Height: ±0.8 mm (or ±0.04 in.)
  • Fin Pitch/Density: +5% / -2%
  • Fin Weld Integrity: Continuous bond with controlled weld width and minimal interruptions
  • Straightness: Max 1.5 mm per meter
All tubes undergo strict dimensional and non-destructive testing.Performance Advantages


  • Enhanced Heat Transfer: Serrated design increases turbulence and air-side heat transfer efficiency by 15–30%+ compared to solid fins.
  • Strong Metallurgical Bond: High-frequency forge weld provides excellent thermal conductivity and long-term fin retention under vibration and thermal cycling.
  • High-Temperature Capability: P11 base material excels in creep and oxidation resistance for service temperatures often exceeding 500–600°C depending on design.
  • Durability & Reliability: Superior resistance to corrosion, erosion, and mechanical stress in flue gas environments.
  • Design Flexibility: Enables more compact and cost-effective heat exchanger designs.
  • Energy Efficiency: Higher overall heat transfer rates reduce fuel consumption and improve system performance.
Detailed Application Fields

Our A335 P11 HFW Serrated Fin Tubes are proven in:


  • Power Generation: Heat Recovery Steam Generators (HRSG), economizers, boiler air heaters, and superheaters.
  • Petrochemical & Refining: Fired heaters, air-cooled heat exchangers (ACHE), and waste heat recovery units.
  • Oil & Gas: Process heaters, gas coolers, and flare gas recovery systems.
  • Industrial Boilers & Furnaces: Combustion air pre-heaters and flue gas coolers.
  • Chemical & Metallurgical Plants: High-temperature reactors and heat recovery systems.
  • Cement & Other Heavy Industries: Kiln waste heat recovery and similar demanding gas-to-fluid applications.
Why Choose Us? Our Advantages and Experience

As an experienced exporter and manufacturer of high-frequency welded finned tubes, we specialize in premium A335 P11 + GR.11 serrated solutions.
  • Advanced Manufacturing: State-of-the-art HFW equipment ensures consistent, high-quality welds.
  • Material Expertise: Mill-certified ASTM A335 P11 and compatible GR.11 materials with full traceability.
  • Customization: Tailored fin geometry, density, and lengths to meet your exact thermal and mechanical specifications.
  • Quality Assurance: ASME, ASTM, and international standards compliance, including hydrostatic testing, PMI, and visual/NDE inspections.
  • Global Track Record: Successful long-term supply to power plants, refineries, and EPC contractors worldwide with proven on-site performance.
  • Technical Support: Comprehensive heat transfer calculations, material recommendations, and responsive after-sales service.
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Serrated Finned Tube A335 P11 for Boiler & Heat Recovery

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Product Detail
Certification :
ISO9001:2015; ISO14001:2015; ISO45001:2018; PED 2014/68/EU;
Model Number :
Serrated Finned Tube
Outer Diameter (Base Tube) :
25.4 mm – 168.3 mm (or custom)
Place of Origin :
CHINA
Brand Name :
YUHONG
MOQ :
10PCS
Contact Supplier
Serrated Finned Tube A335 P11 for Boiler & Heat Recovery
Serrated Finned Tube A335 P11 for Boiler & Heat Recovery
Serrated Finned Tube A335 P11 for Boiler & Heat Recovery
Serrated Finned Tube A335 P11 for Boiler & Heat Recovery

YUHONG HOLDING GROUP CO., LTD

Verified Supplier
3 Years
ningbo
Since 1990
Business Type :
Manufacturer, Importer, Exporter, Trading Company, Seller, Other
Main Products :
Stainless Steel Heat Exchanger Tube, Studded Tube, Duplex Stainless Steel Heat Exchanger Tube
Total Annual :
50M-70M
Employee Number :
50~800
Certification Level :
Verified Supplier
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