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{"title":"Serrated Finned Tube A335 P11 for Boiler & Heat Recovery","imgUrl":"https:\/\/img.chinax.com\/nimg\/2a\/ba\/ce7ae28995bff102b1f80ee64258-200x200-1\/serrated_finned_tube_a335_p11_for_boiler_26amp_3b_heat_recovery.jpg","attrs":{"Certification":"ISO9001:2015; ISO14001:2015; ISO45001:2018; PED 2014\/68\/EU;","Model Number":"Serrated Finned Tube","Outer Diameter (Base Tube)":"25.4 mm \u2013 168.3 mm (or custom)","Place of Origin":"CHINA"}}
{"title":"HFW Serrated Finned Tubes ASME SA213 T22 With CS Fins For Heat Exchanger","imgUrl":"https:\/\/img.chinax.com\/nimg\/9e\/d2\/5f1f939fddeeca6ab76745953e16-200x200-1\/hfw_serrated_finned_tubes_asme_sa213_t22_with_cs_fins_for_heat_exchanger_equipment.jpg","attrs":{"Brand Name":"Yuhong","Model Number":"HFW Serrated Finned Tubes","Certification":"ABS, BV, DNV, CCS, LR","Place of Origin":"China"}}
{"title":"Welding Fin Tube, Serrated Type, Helical Serrated, Base Tube ASTM A312 TP347","imgUrl":"https:\/\/img.chinax.com\/nimg\/44\/6b\/fe79f82b6688415738b9e723e4e0-200x200-1\/welding_fin_tube_2c_serrated_type_2c_helical_serrated_2c_base_tube_astm_a312_tp347_with_ss409_fin_material.jpg","attrs":{"Brand Name":"Yuhong","Model Number":"Serrated Fin Tube, Helical Serrated Fin Tube","Certification":"ABS, BV, DNV, CCS, LR","Place of Origin":"China"}}
{"title":"High Frequency Tp347 Serrated Fin Tube","imgUrl":"https:\/\/img.chinax.com\/nimg\/a5\/00\/0c52899b1ac3f70d00d6c8ad2067-200x200-1\/high_frequency_tp347_serrated_fin_tube.jpg","attrs":{"Brand Name":"Yuhong","Model Number":"Serrated Fin tube , HFW Fin tube , Fin tube","Certification":"ABS, BV, DNV, CCS, LR","Place of Origin":"China"}}
{"title":"ASTM A335 P22 Serrated Finned Tubes for HRSG Applications","imgUrl":"https:\/\/img.chinax.com\/nimg\/61\/d4\/a77d99f752770b70aa712267547b-200x200-1\/astm_a335_p22_serrated_finned_tubes_for_hrsg_applications.jpg","attrs":{"Model Number":"N\/A","Brand Name":"YUHONG","Minimum Order Quantity":"500kgs","Delivery Time":"50-120 days"}}
{"title":"ASTM A213 TP347H Serrated Finned Tube For Refrigeration And Air Conditioning","imgUrl":"https:\/\/img.chinax.com\/nimg\/ef\/e1\/251ad7968309abc5f944ddfc893f-200x200-1\/astm_a213_tp347h_serrated_finned_tube_for_refrigeration_and_air_conditioning_systems.jpg","attrs":{"Brand Name":"YUHONG","Certification":"ABS, BV, ISO, ASTM, SGS","Place of Origin":"China","Minimum Order Quantity":"200-500KGS"}}
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.
datangfinpipe.com
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)
metalspiping.com
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.
datangfinpipe.com
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):
vulcanfinnedtubes.com
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.
datangfintubes.com
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.
Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories, the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always. &n... Yuhong Holding Group has more than 35 years experience for pipeline products, till now we have 3 big joint venture factories, the total production area more than 130000 square meters, and more than 600 workers with 106 production lines give our clients excellent supporting always. &n...
