ASTM A335 P22 HFW Solid Finned Tube With 11-13Cr Fins For Power Plant Boilers

ASTM A335 P22 HFW Solid Finned Tube with 11-13Cr Fins For Power Plant Boilers

The ASTM A335 P22 HFW (High-Frequency Welded) Solid Finned Tube with 11-13% Chromium (Cr) Fins is a high-performance heat exchanger tube designed for extreme conditions in industrial applications. Below is a detailed breakdown of its components, manufacturing process, and key characteristics:


1. Base Tube: ASTM A335 P22 (Grade P22)

• Material: Low-alloy steel (2.25% Chromium, 1% Molybdenum).
• Standard: ASTM A335 (Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service).
• Manufacturing Process: HFW (High-Frequency Welded) – A precision welding technique that creates a strong, near-seamless bond, suitable for high-pressure applications.

(1). Chemical Composition (Weight %)

Notes:

Key Alloys: The 2.25% Cr-1% Mo composition provides excellent creep resistance and high-temperature strength.

Impurity Control: Low S and P minimize brittleness at elevated temps.

(2). Mechanical Properties

Notes:

High-Temp Performance: Retains strength up to 600°C (short-term exposure to 650°C).

Creep Resistance: Designed for long-term service under stress at 450–600°C (e.g., power plant piping).

(3). Heat Treatment

• Normalization: Heated to 900–970°C, air-cooled for uniform grain structure.
• Tempering: Followed by heating to 675–775°C to reduce brittleness.
• Result: Optimized balance of strength and ductility.

2. Fins: 11-13% Chromium Steel

• Material: Stainless steel with 11-13% Cr (similar to grades like 409, 410, or 405 stainless steel).
• Fin Type: Solid fins (mechanically bonded or welded to the base tube).
• Properties:
• High-temperature oxidation resistance (superior to aluminum fins).
• Corrosion resistance against sulfur (H₂S), chlorides, and flue gas.
• Erosion resistance to fly ash/particulates (critical in coal-fired plants).

3. Manufacturing Process

• Tube Production:

P22 steel strip is formed into a tube and welded using HFW for a uniform, high-strength joint.

• Fin Attachment:

Solid fins are helically wound or embedded into the tube surface.

• Bonding Methods:

High-pressure extrusion (for integral fins).

Resistance welding (for welded fins).

Knurling/Grooving (to enhance fin adhesion).

• Post-Treatment:

Stress relieving/annealing to ensure stability under thermal cycling.

4. Key Features & Advantages

The ASTM A335 P22 HFW (High-Frequency Welded) solid finned tube with 11-13% chromium (Cr) fins is a specialized heat exchanger component designed for high-temperature, high-pressure, and corrosive environments. Below are its key applications and advantages:

1. Primary Applications

(1) Power Plant Boilers & Heat Recovery Steam Generators (HRSG)

• Used in superheaters, reheaters, and economizers where high-pressure steam (up to 100+ bar) and temperatures (450–600°C) are present.
• Resistant to flue gas corrosion (sulfur, chlorides) due to the 11-13% Cr fins.

(2) Petrochemical & Refinery Processes

• Fired heaters, reformers, and cracking furnaces where high-temperature hydrocarbons or process gases (e.g., in ethylene plants) require efficient heat transfer.
• The chromium-rich fins resist oxidation and sulfidation in sulfur-rich environments.

(3) Waste Heat Recovery Systems

• Recovers energy from high-temperature exhaust gases (e.g., in cement kilns, steel plants).
• The HFW (High-Frequency Welded) P22 base tube ensures structural integrity under thermal cycling.

(4) Combined Cycle & Cogeneration Plants

• Used in gas turbine exhaust ducts or heat exchangers where aggressive exhaust gases (NOx, SOx) demand corrosion-resistant fins.

2. Why ASTM A335 P22 HFW Tube + 11-13% Cr Fins?

(a) Base Tube (ASTM A335 P22)

Material: Low-alloy steel (2.25Cr-1Mo) with excellent creep resistance at high temps.

HFW Process: Provides a seamless-like structure with high pressure tolerance.

Operating Range: Suitable for 500–600°C, common in power/process industries.

(b) 11-13% Chromium Fins

Oxidation Resistance: Withstands scaling at high temps (better than aluminum fins).

Corrosion Resistance: Resists sulfidation (H₂S) and chloride-induced pitting.

Mechanical Strength: Higher durability than pure Al/Cu fins in abrasive gas flows.

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.