Payment Terms | TT, LC |
Supply Ability | According to Clients' requirements |
Delivery Time | 45-75 Days (Depend on Customer's Requirements) |
Packaging Details | Ply-wooden Cases with Steel Frames(both ends of pipes have plastic caps) |
Base Pipe Specification | ASTM A335 |
Base Pipe Material | P9 |
Fin Type | Spiral High Frequency Welding Finned Tube/Solid Finned Tube |
Fin Material | 13 Cr |
Base Tube/Pipe OD | 16-219 mm |
Fin Pitch | 3-25 mm |
Fin Height | 5-30 mm |
Fin Thickness | 0.8-3 mm |
Pipe Length | Customsized |
Application | Air preheaters, Boiler, Heat exchangers and so on |
Brand Name | Yuhong |
Model Number | ASTM A335 P9 HFW Solid Finned Tube with 13 Cr Fins |
Certification | ABS, BV, DNV, CCS, LR |
Place of Origin | China |
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Product Specification
Payment Terms | TT, LC | Supply Ability | According to Clients' requirements |
Delivery Time | 45-75 Days (Depend on Customer's Requirements) | Packaging Details | Ply-wooden Cases with Steel Frames(both ends of pipes have plastic caps) |
Base Pipe Specification | ASTM A335 | Base Pipe Material | P9 |
Fin Type | Spiral High Frequency Welding Finned Tube/Solid Finned Tube | Fin Material | 13 Cr |
Base Tube/Pipe OD | 16-219 mm | Fin Pitch | 3-25 mm |
Fin Height | 5-30 mm | Fin Thickness | 0.8-3 mm |
Pipe Length | Customsized | Application | Air preheaters, Boiler, Heat exchangers and so on |
Brand Name | Yuhong | Model Number | ASTM A335 P9 HFW Solid Finned Tube with 13 Cr Fins |
Certification | ABS, BV, DNV, CCS, LR | Place of Origin | China |
ASTM A335 P9 High Frequency Welding Solid Finned Tube with Alloy Fins For Refinary
ASTM A335 P9 High Frequency Welding (HFW) Solid Finned Tube with Alloy Fins for Refinery is a specialized type of heat exchanger tube designed for high-temperature and corrosive environments, commonly used in refineries, petrochemical plants, and power generation. Here's a breakdown of its key features:
1. Base Tube Material:
(1) Chemical Composition of ASTM A335 P9
The composition complies with ASTM A335/A335M standards.
Element | Composition (% Weight, Max unless specified) |
Carbon (C) | 0.15 max (typically 0.05–0.15) |
Manganese (Mn) | 0.30–0.60 |
Phosphorus (P) | 0.025 max |
Sulfur (S) | 0.025 max |
Silicon (Si) | 0.50–1.00 |
Chromium (Cr) | 8.00–10.00 |
Molybdenum (Mo) | 0.90–1.10 |
Nickel (Ni) | 0.40 max (residual) |
Vanadium (V) | 0.18–0.25 (optional for enhanced creep resistance) |
Key Notes:
9% Cr-1% Mo composition provides oxidation & sulfidation resistance at high temps (up to 650°C / 1200°F).
Low carbon reduces weldability issues (pre-heat & post-weld heat treatment required).
Vanadium (V) may be added in modified grades (e.g., P9b) for better creep strength.
(2) Mechanical Properties of ASTM A335 P9
Per ASTM A335, the seamless pipe must meet the following requirements:
Property | Value |
Tensile Strength (MPa) | ≥ 415 (60 ksi) |
Yield Strength (MPa) | ≥ 205 (30 ksi) |
Elongation (% in 50mm) | ≥ 30 (varies with wall thickness) |
Hardness (Brinell HB) | ≤ 179 (typically ~150–170 HB) |
Additional Notes:
Heat Treatment: P9 pipes are supplied in normalized & tempered condition for optimal strength and toughness.
High-Temperature Performance: Retains strength at up to 600–650°C (refinery furnace tubes, boilers).
Impact Testing: Often required for low-temperature service (e.g., Charpy V-notch per ASTM A370).
(3) Comparison with Similar Grades
Grade | Cr (%) | Mo (%) | Max Temp (°C) | Key Use |
P5 | 4–6 | 0.45–0.65 | 550 | Less corrosive environments |
P9 | 8–10 | 0.9–1.1 | 650 | Refineries, high-sulfur service |
P11 | 1.0–1.5 | 0.44–0.65 | 550 | Lower-cost alternative |
2. High-Frequency Welding (HFW) Process
The fins are welded to the base tube using high-frequency induction welding, ensuring a strong metallurgical bond.
Provides better heat transfer efficiency compared to embedded or wrapped fins.
Suitable for high-stress environments due to superior joint integrity.
3. Solid Finned Design with Alloy Fins
Fins are made from an alloy (often stainless steel or nickel-based alloys) to enhance corrosion and oxidation resistance.
Solid fins (as opposed to serrated or studded) provide better durability in harsh refinery conditions.
Increases heat transfer surface area, improving thermal efficiency.
4. Key Advantages of ASTM A335 P9 Solid Finned Tube
The ASTM A335 P9 High Frequency Welding (HFW) Solid Finned Tube with Alloy Fins is designed for high-temperature, high-pressure, and corrosive environments, making it ideal for demanding applications in refineries, petrochemical plants, and power generation. Below are its key applications:
1. Refinery & Petrochemical Applications
a) Fired Heaters & Process Furnaces
Used in crude oil heaters, reformers, and hydrocracking furnaces where temperatures exceed 600°C (1112°F).
Resists sulfidation (H₂S attack) and oxidation due to 9% Cr-1% Mo alloy base + corrosion-resistant alloy fins (e.g., SS 304/321, Incoloy).
b) Waste Heat Recovery Systems
Recovers heat from flue gases in refinery units (e.g., catalytic crackers, cokers).
Alloy fins (e.g., Inconel 625) prevent degradation from acidic condensates.
c) Hydroprocessing Units
Hydrogen-rich environments (e.g., hydrodesulfurization - HDS, hydrocracking).
HFW fins ensure no fin detachment under thermal cycling.
2. Power Generation & Boilers
a) Boiler Superheaters & Reheaters
Withstands steam temperatures up to 650°C (1200°F).
Alloy fins (e.g., SS 347) resist coal ash corrosion in coal-fired plants.
b) Heat Recovery Steam Generators (HRSGs)
Used in combined-cycle power plants for exhaust gas heat recovery.
HFW welding prevents fin failure under rapid thermal transients.
3. Chemical & Fertilizer Industry
a) Ammonia & Urea Plants
High-pressure synthesis gas heaters (resists hydrogen embrittlement).
Alloy fins protect against nitriding attack.
b) Sulfuric Acid & Olefin Plants
Corrosion-resistant fins (e.g., Hastelloy) handle acidic and chlorinated environments.
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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