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 | P1, P5, P11, P12, P22, P91 |
| Fin pitch | FPI: 3-25 |
| Fin Material | Carbon Steel |
| Fin height | 5-30mm |
| Product Name | Max 43M/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 | P1, P5, P11, P12, P22, P91 |
| Fin pitch | FPI: 3-25 | Fin Material | Carbon Steel |
| Fin height | 5-30mm | Product Name | Max 43M/PC |
| Brand Name | Yuhong | Certification | ABS, BV, DNV, CCS, LR |
| Place of Origin | China | ||
| High Light | P9 Finned Tube ，ASTM A335 P9 Finned Tube ，Heat Transfer Equipments Finned Tube | ||
We are the manufacturer of solid fin tube in China. As we have four production line of solid fin tube, we take great of our quality. We can customize the fin height, width, material and other parts according to customers' needs. Our spiral fin tube mainly used in power Plant, air preheaters, boiler, heat exchangers, inudustrial furnaces and other equipments to increase the heat exchange efficiency. And I am pleased to share following details about spiral HFW fin tube:
1. ASTM A335 P9 Base Tube
| Grade | UNS Designation | C | Mn | P | S | Si | Cr | Mo | Other |
| P9 | K90941 | 0.15 | 0.30–0.60 | 0.025 | 0.025 | 0.25-1.0 | 8.0-10.0 | 0.9-1.1 | . . . |
2. Manufacturing & Fabrication Processes
A. Base Tube Production
Process Flow:
Electric arc furnace → Vacuum degassing → Forging → Hot rolling (950–1050°C) → Heat treatment (normalizing at 950°C + tempering at (740–790°C) → NDT testing
Critical Steps: Precise heat treatment prevents grain coarsening and ensures uniform carbide distribution.
B. Fin Attachment via Welding
Welding Method:
GTAW (TIG) for root pass + SMAW (manual arc) for fill/cap.
Filler Materials:
TG-S9CM (TIG wire) and R707 (low-hydrogen electrode) for P9-carbon steel joints.
Pre-Weld Requirements:
Preheat: 250–350°C to prevent cracking.
Back purging with argon to shield against oxidation.
Post-Weld Treatment:
Stress relief: 300–350°C for 30 min (immediate post-heat).
Full PWHT at 740–790°C to reduce hardness and residual stresses.
3. A335 P9 Solid Fin Tube Advantage
Enhanced Heat Transfer: The solid fins provide a larger surface area, improving heat transfer efficiency in heat exchangers, economizers, and superheaters.
High Mechanical Strength: Made from ASTM A335 P9 alloy steel, these tubes withstand high pressures and temperature variations.
Durability and Reliability: Solid fin design offers increased structural integrity, resistance to damage, and longer service life.
Corrosion and Thermal Resistance: Suitable for high-temperature environments, resisting oxidation and thermal stresses.
Reduced Fouling: Smooth, continuous fin surfaces help minimize fouling and facilitate easier cleaning.
Cost-Effective: The robust design reduces maintenance costs and downtime over the operational lifespan.
4. A335 P9 Solid Fin Tube Application
Power Generation: Used in boiler superheaters, reheaters, and economizers to optimize heat transfer and improve efficiency.
Petrochemical & Refining: Employed in heat exchangers for process heating, cooling, and energy recovery.
Chemical Processing: Suitable for high-temperature process units requiring durable, efficient heat transfer solutions.
Industrial HVAC: Installed in large-scale heating systems requiring high thermal performance.
Marine and Off-shore: Applied in systems exposed to severe conditions with a need for high durability.
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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