ASTM A179 Carbon Steel Wound KL Type Fin Tube For Heat Exchangers and Air

Product Specification

1.ASTM A179 Carbon Steel Wound KL Fin Tube

ASTM A179 is a **low-carbon seamless carbon steel** specification dedicated to heat exchanger tubes, renowned for its excellent formability, weldability, and cost-effectiveness. It is engineered for low to medium-temperature service environments, providing reliable structural integrity in general corrosive and thermal cycling conditions. The KL-type finned tube refers to a special fin structure, also known as the knurled finned tube. It involves knurling the base tube before winding the fins, with subsequent blades used for the winding process. Knurling and fin winding can be performed simultaneously. This type of finned tube exhibits high heat transfer performance and low thermal contact resistance.

ASTM A179 Carbon Steel Wound KL-Type Fin Tube integrates the cost advantage of A179 carbon steel with the enhanced heat transfer performance of KL-type wound fins. The winding process ensures intimate contact between fins and the base tube, minimizing thermal resistance, while the KL fin profile optimizes fluid disturbance. 

2. Chemical Composition

Base Tube - A179 Chemical Composition (%)

3. Mechanical Properties (Base Tube - A179)

4. L Type VS. KL Type

The L-type finned tube has an operating temperature of 230°C. Characteristics: It utilizes a winding process, which ensures high production efficiency, uniform fin spacing, excellent heat transfer performance, and a high fin ratio. The base tube is protected from atmospheric corrosion.

The KL-type finned tube, also known as the knurled finned tube, has a maximum service temperature of less than 250°C and a maximum service pressure of ≤3.2 MPa. Characteristics: It offers superior heat transfer performance and low thermal contact resistance. The fins have a large contact area with the tube, ensuring tight and secure adhesion. It exhibits excellent atmospheric corrosion resistance and maintains stable performance over long-term use.

5. Key Advantages of the ASTM A179 KL Type Fin Tube

1.Superior Heat Transfer Efficiency: The primary benefit is the dramatic increase in external surface area, which can boost heat transfer performance by 5 to 10 times compared to a bare tube. This leads to more compact and efficient heat exchanger designs.

2.Exceptional Mechanical Stability: The embedded "L" foot design in a machined groove creates a robust, permanent bond. This prevents fin lofting (loosening) even under severe thermal cycling and vibration, ensuring long-term performance and reliability.

3.Durability and Long Service Life: The strong mechanical bond and the inherent strength of carbon steel make this fin tube suitable for demanding industrial environments.

4.Optimized for Gas-to-Liquid Heat Transfer: These tubes are ideal for applications where heat is being transferred from a hot gas (e.g., flue gas, air) to a cooler liquid inside the tube (e.g., water, thermal oil), or vice versa.

6. Applications of ASTM A179 Carbon Steel Wound KL Type Fin Tubes

1. Heat Recovery Steam Generators (HRSG): Capturing waste heat from gas turbine exhaust.

2. Air Heaters: Pre-heating combustion air for boilers and furnaces.

3. Economizers: Improving boiler efficiency by pre-heating feed water using flue gas.

4. Process Gas Coolers: Cooling hot process gases in chemical and petrochemical plants.

5. Fired Heaters and Industrial Ovens.