Products Description
What Are Extruded Serrated Finned Tubes?
Extruded Serrated Finned Tubes represent the pinnacle of bimetallic heat exchanger technology, combining exceptional thermal performance with robust mechanical integrity. These specialized tubes feature an outer aluminum surface that undergoes cold plastic deformation to form precisely engineered serrated fins, dramatically enhancing heat transfer capacity compared to conventional smooth fin designs.
The unique serrated fin configuration creates turbulent flow patterns in the gas or fluid passing over the fins, breaking up the boundary layer and significantly improving thermal efficiency. This makes extruded serrated aluminum finned tubes the preferred choice for applications where space constraints, weight considerations, and thermal performance are critical factors.
Manufacturing Process: Precision Engineering
The fabrication of extruded serrated finned tubes involves a sophisticated multi-stage process that ensures optimal metallurgical bonding and dimensional accuracy:
Step-by-Step Production
- Tube Preparation: The inner base tube (typically carbon steel, stainless steel, or other alloys) is thoroughly cleaned and prepared.
- Aluminum Sleeve Insertion: An aluminum muff tube with precise wall thickness is aligned over the base tube.
- Cold Extrusion: The assembly passes through specialized arbors with rotating discs that apply controlled pressure, extruding the aluminum fins in a spiral pattern through cold working.
- Serration Process: The extruded fins undergo precision machining to create the distinctive serrated pattern, typically with 12 or 24 teeth per inch.
- Finishing Operations: The tubes undergo strip peeling, washing, pressure testing, blast cleaning, and final inspection before packaging.
Serrated Technical Insight
The extrusion process creates a metallurgical bond between the aluminum fin and base tube, ensuring exceptional thermal contact resistance of less than 0.0001 m²K/W. This bond remains stable even under severe thermal cycling conditions, preventing performance degradation over time.
Technical Specifications: Extruded Serrated Finned Tube Dimensions
Extruded Serrated Finned Tube Size and Material Specifications | ||
---|---|---|
Tube OD | 10~51 (mm) | 0.4"~2" |
Tube Wall Thickness | 1.65~3.0 (mm) | 0.065"~0.118" |
Tube Length | ≤18,500 (mm) | ≤60.7 ft |
Fin Thickness | 0.3~1.2 (mm) | 0.012"~0.047" |
Fin Height | 5~16 (mm) | 0.2"~0.63" |
Fin Pitch | 100~555 (mm) | 3~14 FPI |
Serration Pattern | 12 or 24 teeth per inch (custom patterns available) | |
Fin Type | Extruded Serrated |
Extruded Serrated Finned Tube Material Combinations
Fin Materials
Aluminum (1100, 1060, 6063)
Copper (select applications)
Tube Materials
Carbon Steel (A179, A192, SA210)
Stainless Steel (304, 316, 321, 347)
Copper Alloys
Titanium (B338 Gr2)
Performance Parameters
Max Temperature: 300°C
Service: Medium temperature, corrosive environments
Engineering Advantages of Extruded Serrated Design
Exceptional Thermal Bond
100% metallurgical bond between fin and tube eliminates contact resistance, ensuring maximum heat transfer efficiency throughout the tubes service life.
Enhanced Corrosion Protection
The aluminum sleeve completely encapsulates the base tube, providing superior protection against atmospheric corrosion and chemical attack.
Mechanical Durability
Extruded fins demonstrate exceptional resistance to vibration, mechanical damage, and fin deformation during cleaning operations.
Optimized Fluid Dynamics
Serrated fin design creates turbulent flow, disrupting boundary layers and increasing heat transfer coefficients by 25-40% compared to smooth fins.
Reduced Pressure Drop
The unique fin geometry increases flow area, creating a "wind tunnel effect" that minimizes pressure differential across the fin surface.
Temperature Resilience
Stable performance at temperatures up to 325°C, with excellent resistance to thermal cycling stress and fin loosening.
Performance Analysis
The serrated fin design increases the effective heat transfer surface area by 15-25% compared to equivalent smooth fins, while the extrusion process ensures optimal fin density and distribution. This combination delivers superior thermal performance in compact heat exchanger designs.
Manufacturing Process Demonstration
Industrial Applications
Extruded serrated finned tubes excel in demanding applications where reliability, efficiency, and corrosion resistance are paramount:
"The combination of extruded construction and serrated fin design represents the optimal solution for applications requiring maximum heat transfer in corrosive or fouling environments. The mechanical integrity of the fin-to-tube bond ensures long-term performance stability that alternative finning methods cannot match."
Extruded Serrated Finned Tube Product Visualization

Extruded Serrated Finned Tube showing precise fin geometry and metallurgical bond integrity
Technical Enquiry Requirements
To provide a comprehensive quotation for extruded serrated finned tubes, please include the following specifications:
- Base tube material specification
- Base tube dimensions (OD × WT × Length)
- Fin material selection
- Fin type and serration pattern
- Fin diameter or height requirements
- Fin thickness specification
- Fins per inch or fin pitch
- Length of plain, unfinned ends
- Total finned tube quantity
- Additional fabrication requirements (bending, welding, assembly)