ASTM A335 P9 High Frequency Welding Solid Finned Tube with Alloy Fins For Refinary

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.

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:

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

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

• High thermal conductivity due to alloy fins.
• Long service life in corrosive refinery environments.
• Strong weld integrity prevents fin detachment under thermal cycling.

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.

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.   The factories already got certificates like : ABS, LR, DNV-GL, BV, KR, CCS, ASME, ISO 9001, ISO14001, ISO18001, ect.

Our factories main products as below : 
Factory 1th: Stainless steel seamless tube, Duplex steel seamless tube, Super duplex steel seamless tube, Nickel alloy steel seamless tube;

Factory 2th: Carbon steel seamless tube, Alloy steel seamless tube; Enhanced Heat Tranfer Tube, low fin tube ,U bending workshop;
Factory 3th: High frequency welding fin tube(HFW fin tube, Solid Fin tube, Studded Tube, Serrated Fin tube, Longitudinal welding fin tube), Wound fin tube(L type fin tube, LL type fin tube,  KL type fin tube), Embedded G type fin tube , Extruded fin tube,  low fin tube, U bend & 180deg. Return;

Yuhong Holding Group also has gained rich experience for project package( products contain:Pipes, Fittings, Flanges, heat exchanger, furnace, fired heater, air cooler, boiler) , YUHONG brand has marked its global presence in more than 85 countries, like, Korea, USA, Canada, Mexico, Colombia, Bolivia, Chile, Argentina, Brazil, Ecuador, Austria, New Zealand, Singapore, Malasyia, Indonesia, Thailand, Vietnam, Ukraine, Turkey,Sauid Arabia, Qatar, U.A.E,Israel,India, UK, France, Italy, Gernmany, Poland, Spain,... We have successfully implemented the orders of Cross Country Pipelines for our valuable customers. In addition, we have also developed a huge network of contacts and strategic alliances with most important manufacturers as stockists around the world.