YUHONG HOLDING GROUP CO., LTD
| Payment Terms | TT, LC |
| Supply Ability | 10000 tons/month |
| Delivery Time | According to the quantity |
| Packaging Details | IRON FRAME CASE WITH PLASTIC CAP |
| Fin Wall thickness | 0.8-3mm |
| Base Tube Material | P5, P9, P11, P22, P91 |
| Fin Pitch | FPI: 3-25 |
| Fin Material | Cr11 |
| Fin Height | 5-30mm |
| Length | Max 34M/PC |
| Brand Name | Yuhong |
| Certification | ABS, BV, DNV, CCS, LR |
| Place of Origin | China |
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Product Specification
| Payment Terms | TT, LC | Supply Ability | 10000 tons/month |
| Delivery Time | According to the quantity | Packaging Details | IRON FRAME CASE WITH PLASTIC CAP |
| Fin Wall thickness | 0.8-3mm | Base Tube Material | P5, P9, P11, P22, P91 |
| Fin Pitch | FPI: 3-25 | Fin Material | Cr11 |
| Fin Height | 5-30mm | Length | Max 34M/PC |
| Brand Name | Yuhong | Certification | ABS, BV, DNV, CCS, LR |
| Place of Origin | China | ||
| High Light | Power Plant Boilers Fin Tube ，Superheaters Serrated Fin Tube ，ASTM A335 P11 Fin Tube | ||
1. A335 P11 Base Tube Composition
| Grade | UNS Designation | C | Mn | P | S | Si | Cr | Mo | Other |
| P11 | K11597 | 0.05-0.15 | 0.30-0.60 | 0.025 | 0.025 | 0.5-1.0 | 1.00–1.50 | 0.44–0.65 | ... |
2. A335 P11 Serrated Fin Tube Design
Structure:
Fins are mechanically attached or welded to the A335 P11 base tube in a helical pattern with periodic notches (serrations).
Serrations increase surface area by 8–10× compared to bare tubes and disrupt thermal boundary layers, enhancing turbulence.
Thermal Efficiency:
Serrations create micro-vortices, improving heat transfer rates by 25–40% over smooth fins.
Ideal for viscous fluids (e.g., heavy oils) or low-velocity gases where boundary layer resistance is high.
3. A335 P11 Serrated Fin Tube Manufacturing Process
Base Tube Production:
Seamless manufacturing via hot extrusion, cold drawing, or rotary piercing to ensure uniform wall thickness (2–130 mm).
Heat treatment (annealing or normalizing + tempering) optimizes grain structure.
Fin Attachment:
Extrusion: Aluminum fins cold-forged onto the tube, creating a metallurgical bond.
Welding: High-frequency welding for stainless steel fins; preheating (150–200°C) required for P11 to avoid cracking.
Quality Control:
Hydrostatic testing and non-destructive exams (e.g., eddy current) ensure leak resistance.
4. A335 P11 Serrated Fin Tube Key Applications
Power Plants:
Boiler superheaters/reheaters (e.g., SA-335 Gr.P11 tubes in coal-fired plants).
Petrochemical Industry:
Crackers, reformers, and heat recovery units handling corrosive gases (e.g., H₂S) at 400–550°C.
Enhanced Recovery Systems:
Waste heat boilers where serrated fins mitigate fouling from ash/particulates.
5. A335 P11 Serrated Fin Tube FAQ
1.What is the maximum service temperature for A335 P11 fin tubes?
2.Why choose serrated fins over smooth fins?
3. Can A335 P11 handle corrosive environments?
4. How are fins attached to the base tube?
5. Where is it used most?
Conclusion
A335 P11 serrated fin tubes combine the high-temperature resilience of chromium-molybdenum alloy with optimized heat transfer from serrated fin geometry. They are critical in energy-intensive sectors like power generation and petrochemical processing, where efficiency and material durability are paramount. For detailed specifications (e.g., dimensions: 21.3–762 mm OD; schedules: SCH20–XXS), refer to ASTM/ASME standards.
Company Details
Business Type:
Manufacturer,Importer,Exporter,Trading Company,Seller,Other
Year Established:
1990
Total Annual:
50M-70M
Employee Number:
50~800
Ecer Certification：
Verified Supplier
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...
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