Extruded Finned Tubes for Dry Coolers – ASME SA179 Steel

Our extruded finned tubes for dry coolers are engineered for efficient air-side heat transfer in industrial and commercial cooling systems. The product uses ASME SA179 seamless cold-drawn low-carbon steel tubing as the base tube, providing reliable mechanical properties, dimensional consistency, and suitability for heat-transfer equipment.

The extruded fin structure is formed by mechanically processing an outer aluminum tube over the base tube. During the extrusion process, the aluminum material is plastically deformed to create integral, high-density fins with excellent contact between the fin sleeve and the steel base tube. This construction helps maximize heat-transfer area while providing strong fin stability and long-term operating reliability.

ASME SA179 is specified for seamless cold-drawn low-carbon steel heat-exchanger and condenser tubes, making it a well-established base-tube material for compatible heat-transfer applications. cnkpipefitting.com

• High heat-transfer efficiency: Closely formed extruded fins significantly increase the external heat-transfer surface.
• Excellent fin-to-tube contact: The extrusion process creates a tight mechanical bond between the aluminum fin material and the base tube.
• Durable fin structure: Integral extruded fins offer good resistance to loosening and mechanical damage during handling and operation.
• Corrosion protection: The aluminum outer layer can help protect the underlying base tube from certain atmospheric conditions.
• Reliable ASME SA179 base tube: Seamless cold-drawn low-carbon steel provides consistent quality for heat-transfer equipment.
• Custom-engineered configurations: Tube dimensions, fin geometry, materials, and lengths can be manufactured according to dry cooler design requirements.

Extruded finned tubes with ASME SA179 base tubes are suitable for dry cooler and air-cooled heat-transfer equipment, including:

• Industrial dry cooling systems
• Air-cooled heat exchangers
• Process cooling units
• HVAC and refrigeration cooling equipment
• Generator and equipment cooling systems
• Power and energy industry cooling applications
• Closed-loop fluid cooling systems

The following ranges represent typical manufacturing capabilities. Final dimensions can be customized according to project requirements and equipment design.

ASME SA179 covers seamless cold-drawn low-carbon steel heat-exchanger and condenser tubes in outside diameters from 1/8 in. to 3 in. (3.2–76.2 mm). cnkpipefitting.com

Note: Fin dimensions should be selected based on air velocity, operating temperature, pressure drop, fouling conditions, and required thermal performance.

The ASME SA179 low-carbon steel base tube has controlled chemical requirements designed to support cold drawing and heat-transfer applications.

The standard restricts the addition of alloying elements beyond those specified for the grade. cnkpipefitting.com

These properties provide a useful balance of strength and ductility for seamless heat-exchanger tubing. The base tubes are manufactured by the seamless process, cold drawn, and heat treated after the final cold-drawing pass as required by the applicable specification. cnkpipefitting.com

Our extruded finned tubes are produced through a controlled manufacturing process:

1. Base tube selection – ASME SA179 seamless steel tubes are inspected before finning.
2. Surface preparation – The tube surface is cleaned to support uniform forming and close contact with the fin material.
3. Aluminum sleeve application – An aluminum outer tube is positioned over the steel base tube.
4. Extrusion and fin forming – The aluminum sleeve is mechanically extruded to form continuous external fins.
5. Dimensional inspection – Fin height, pitch, outside diameter, and straightness are verified.
6. Final inspection and protection – Finished tubes undergo visual and quality inspection before packing.

The result is a robust finned surface designed to increase air-side heat-transfer area while maintaining a strong and stable structure.

Quality control can include the following inspection and testing methods, depending on the purchase specification and project requirements:

• Chemical composition analysis
• Tensile testing
• Hardness testing
• Flattening test
• Flaring test
• Hydrostatic testing or other specified nondestructive examination
• Dimensional measurement of outside diameter and wall thickness
• Surface and visual inspection

ASTM's published summary for A179 identifies testing requirements including hardness, flattening, flaring, flange, and hydrostatic tests. ASTM Store

• Base tube and finished tube dimensional inspection
• Fin height and fin pitch measurement
• Fin outside diameter verification
• Fin continuity and uniformity inspection
• Fin-to-tube contact inspection
• Tube straightness measurement
• Visual inspection for damaged, crushed, or incomplete fins
• Packing and identification inspection

Additional testing, such as eddy current testing, ultrasonic testing, pressure testing, or third-party inspection, can be arranged when required by the project specification.

With a focus on industrial heat-transfer components, we supply customized extruded finned tubes for dry cooler manufacturers and heat-exchanger projects. Each product can be designed around the customer's thermal, mechanical, and dimensional requirements.

Our advantages include:

• Professional material and fin configuration support
• Customized dimensions and fin geometry
• Strict incoming and final quality inspection
• Reliable manufacturing consistency
• Flexible packaging for domestic and international transportation
• Technical documentation and material certification available upon request

Whether your project requires standard finned tubes or a customized dry cooler solution, our team can help optimize the tube configuration for thermal efficiency, durability, and long-term operating performance.

To receive an accurate quotation, please provide:

• Base tube material and standard
• Base tube outside diameter and wall thickness
• Tube length
• Fin material
• Fin outside diameter and height
• Fin density or fin pitch
• Quantity required
• Operating temperature and service conditions
• Inspection or certification requirements