YUHONG HOLDING GROUP CO., LTD
| Payment Terms | L/C,T/T,AT SIGHT |
| Supply Ability | According to Clients' requirements |
| Delivery Time | 45-75 Days (Depend on Customer's Requirement） |
| Packaging Details | Ply-wooden Cases with Steel Frames(both ends of pipes have plastic caps） |
| Fin Type | Solid Fin Tube, High Frequency Fin Tube, HWF Fin Tube |
| Bare Tube Diameter | 16-219 MM |
| Bare Tube Material | TP347H/ 1.4961/ UNS S34709 |
| Bare Tube Standard | ASTM A376 |
| Fin Material | 11CR |
| Fin Thickness | 1.3MM |
| Unfinned Length | 75MM/75MM |
| Application | Power Plant, Air preheaters, Boiler, Refrigeration, Heat exchangers , Inudustrial Furnaces, Furnace walls |
| Brand Name | YUHONG |
| Certification | ABS, BV, ISO, ASTM, SGS |
| Place of Origin | China |
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Product Specification
| Payment Terms | L/C,T/T,AT SIGHT | Supply Ability | According to Clients' requirements |
| Delivery Time | 45-75 Days (Depend on Customer's Requirement） | Packaging Details | Ply-wooden Cases with Steel Frames(both ends of pipes have plastic caps） |
| Fin Type | Solid Fin Tube, High Frequency Fin Tube, HWF Fin Tube | Bare Tube Diameter | 16-219 MM |
| Bare Tube Material | TP347H/ 1.4961/ UNS S34709 | Bare Tube Standard | ASTM A376 |
| Fin Material | 11CR | Fin Thickness | 1.3MM |
| Unfinned Length | 75MM/75MM | Application | Power Plant, Air preheaters, Boiler, Refrigeration, Heat exchangers , Inudustrial Furnaces, Furnace walls |
| Brand Name | YUHONG | Certification | ABS, BV, ISO, ASTM, SGS |
| Place of Origin | China | ||
| High Light | ASTM A376 TP347H stainless steel fin tube ，11Cr fins solid fin tube ，power plant stainless steel fin tube | ||
1.Base Tube: ASTM A376 TP347H Chemical & Mechanical Properties
Chemical Composition (%)
| Element | C | Mn | Si | P | S | Cr | Ni | Nb |
| Range | 0.04-0.10 | ≤ 2.00 | ≤ 0.75 | ≤ 0.045 | ≤ 0.030 | 17.00-20.00 | 9.00-13.00 | 8×C min – 1.00 |
Mechanical Properties (Base Tube, Room Temperature)
| Tensile Strength (min) | Yield Strength (min) | Elongation (min) |
| ≥ 515 MPa (75 ksi) | ≥ 205 MPa (30 ksi) | ≥ 40% |
The 11Cr fins are made from martensitic stainless steel, containing around 11% chromium. This material is specifically chosen for:
· High-temperature strength: Ensures long-term structural integrity in high-heat environments.
· Weldability: Compatible with TP347H tube for efficient welding.
· Cost-effectiveness: A more economical solution than using fully stainless steel fins while still providing high performance.
TP347H vs. TP321H: Both grades are stabilized to resist intergranular corrosion. TP347H has superior high-temperature strength, making it more suitable for hotter sections of boilers. TP321H is often more cost-effective but best suited for lower temperature ranges.
TP347H vs. TP304H: TP304H is susceptible to sensitization in the weld heat-affected zone, which limits its use in high-temperature, corrosive environments. TP347H, on the other hand, is ideal for long-term service in these conditions.
· Petrochemical Cracking Furnaces: Used in convection sections of ethylene and steam cracking furnaces, where high-temperature corrosive gases are common.
· Power Plant Boilers: In superheaters and reheaters for coal-fired, waste-to-energy, and advanced cycle power plants.
· Chemical Process Heaters: Employed in hydrogen reformers, hydrotreater charge heaters, and other high-temperature chemical process heaters.
· Heat Recovery Steam Generators (HRSG): Used in high-pressure superheater modules for gas turbine combined cycle systems.
· Syngas & Refinery Off-Gas Heaters: Suitable for systems exposed to high-temperature gases containing sulfur, chlorides, and other corrosive agents.
Q1: How does the solid fin design improve heat transfer compared to a bare tube?
A1: The solid fin design increases the external surface area of the tube by 5 to 12 times, significantly enhancing convective heat transfer on the gas side, leading to more efficient thermal performance.
Q2: What is the maximum continuous service temperature for this assembly?
A2: The TP347H tube can handle temperatures up to approximately 700°C (1292°F). However, the service limit of the entire assembly is influenced by the oxidation resistance of the 11Cr fins, typically limiting it to around 620°C (1150°F) for long-term use.
Q3: How does this product’s corrosion resistance compare to an all-stainless solution?
A3: The TP347H tube provides excellent corrosion resistance, while the 11Cr fins offer good oxidation resistance in high-temperature, dry gas environments. However, for wet or acidic environments, full stainless steel fins may provide better overall corrosion protection.
Q4: Can this tube be used in corrosive flue gas environments?
A4: Yes, TP347H provides excellent resistance to oxidation and sulfidation at high temperatures. Its niobium stabilization also ensures strong immunity to intergranular corrosion, making it well-suited for use in corrosive flue gas and process gas applications
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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