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Serrated Finned Tube HF Welding ASTM A335 P9 For Power Generation Boilers

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Serrated Finned Tube HF Welding ASTM A335 P9 For Power Generation Boilers

Brand Name : Yuhong

Model Number : Serrated Finned Tube ASTM A335 P9

Certification : ABS, BV, DNV, CCS, LR

Place of Origin : China

MOQ : Depend the size of finned tubes, 50-100PC

Price : Negotiable

Payment Terms : TT, LC

Supply Ability : 1000 tons/month

Delivery Time : 35-60 days

Packaging Details : Ply-wooden Case With Iron Frame

Product : Fin Tubes or Finned Tube

Finned Tube Type : Serrated Spiral Fin Tubes

Serrated Finned Tube Standard : ASTM A335

Serrated Finned Tube Material And Data : P9 Base Tubes O.D. 88.9MM, W.T.5.49MM

Serrated Finned Tube Fin Material And Data : CS Material, W.T. 1.52MM

Serrated Finned Tube Length : According to clients' need

Serrated Finned Tube Use : For large equipment, Heat Exchanger / Boiler / Furnaces / Condensers / Evaporators, etc

Serrated Finned Tube Packing : Ply-wooden Case With Iron Frame

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Serrated Finned Tube HF Welding ASTM A335 P9 For Power Generation & Boilers​

Chemical Composition (%)

Grade C Mn P S Si Cr Mo Ni V
P9 0.15 0.30-0.60 0.025 0.025 0.25-1.00 8.00-10.00 0.90-1.10 ... ...

Mechanical Properties

Grade Tensile Strength,min Yield Strength (0.2%Offset,min)
P9 60ksi (415 MPa) 30ksi (205 MPa)

ASTM A335 this standard specification for seamless ferritic alloy-steel pipe for high-temperature service, is a critical material standard for fin tubes used in high-temperature and high-pressure applications, such as power plants, petrochemical refineries, and heat recovery systems.

P9 material has good oxidation & corrosion resistance and better than P11/P22. With excellent high-temperature strength (up to 600°C+) and superior creep resistance for long-term thermal cycling, P9 material is suitable for welding & fabrication (requires post-weld heat treatment).

Serrated Finned Tube HF Welding ASTM A335 P9 For Power Generation Boilers

Design Features Serrated Finned Tubes

Serrated Fins:The fins are serrated, increasing turbulence & heat transfer efficiency by ~20-30% vs. smooth fins and reduces ash fouling in flue gas applications.


Material:Usually carbon steel, stainless steel, alloy or copper, providing durability and resistance to corrosion.

Spiral Configuration:Enhance the heat transfer process.

Welding Process:High-FrequencyResistance Welding ensures strong metallurgical bonding.Post-Weld Heat Treatment (PWHT) required to relieve stresses.

Primary Application

Power plant superheaters

Refinery heaters & reformers

HVAC Systems

Waste heat recovery systems

Specifications For Various Types Of Finned Tubes We Can Do

Type Description Base tube Fin specification (mm)
O.D. (mm) Fin pitch Fin height Fin thick
Embedded G-type fin tube 16-63 2.1-5 <17 ~0.4
Extruded Single metal / Combined metal 8-51 1.6-10 <17 0.2-0.4
Low fin tube / T-type fin tube 10-38 0.6-2 <1.6 ~0.3
Bamboo tube / corrugated tube 16-51 8-30 <2.5 ~0.3
Wound L / KL / LL type fin tube 16-63 2.1-5 <17 ~0.4
String String fin tube 25-38 2.1-3.5 <20 0.2-0.5
U-type U-type fin tube 16-38 / / /
Welding HF-welding fin tube 16-219 3-25 5-30 0.8-3
H/HH type fin tube 25-63 8-30 <200 1.5-3.5
Serrated spiral fin tube 25-219 2-7 <38.1 0.9-2.0
Studed fin tube 25-219 8-30 5-35 φ5-20

Serrated Finned Tube HF Welding ASTM A335 P9 For Power Generation Boilers


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