L Type, LL Type, KL Type, Embedded (G), Extruded Finned Tubes
- Base Tube Grades: TP304/304L, TP316/316L, UNS N08904 (904L), EN 1.4301, EN 1.4307, EN 1.4401, EN 1.4404, UNS S32205/S31803/S32750/S32760, Titanium Gr.2/Gr.5, Nickel 200/201, Monel 400, Inconel 600/601/625, Incoloy 800H/800HT, Hastelloy C22/C276, UNS C11000/C44300/C70600/C71500
- Base Tube OD: 16-219mm
- Base Tube WT: 1 – 8mm
- Length: 1000-22000mm
- Type: Seamless
- Fin Material: AA1050, AA1060, AA1080, AA1100, UNS C10100/C11000
L Type, LL Type, KL Type, Embedded (G), Extruded Finned Tubes
Finned Tubes are engineered for efficient heat transfer in demanding industrial environments. Available in L Type, LL Type, KL Type, Embedded (G), and Extruded constructions, these tubes are designed to improve thermal performance, extend service life, and provide reliable operation under corrosive or high-temperature conditions. Golden Sunbird Metals offers a wide range of base tube materials, including stainless steel, duplex stainless steel, titanium, nickel alloys, copper alloys, and other advanced metals.
Fin Types
‘L’ FINNED TUBE
The strip material is subjected to controlled deformation under tension giving the optimum contact pressure of the foot of the fin onto the base tube thus maximising the heat transfer properties.
The foot of the fin considerably enhances the corrosion protection of the base tube.
- Maximum working temperature: 150°c
- Atmospheric corrosion resistance: medium
- Mechanical resistance resistance: low
- Fin materials: aluminium, copper
- Tube materials: any theoretical limit
‘LL’ FINNED TUBE
Manufactured in the same way as the ‘L’ finned tube type except that the fin foot is overlapped to completely enclose the base tube thereby giving excellent corrosion resistance. This type of finned tube is often used as an alternative to the more expensive extruded type fin in corrosive environments.
- Maximum working temperature: 180°c
- Atmospheric corrosion resistance: high
- Mechanical resistance: low
- Fin materials: aluminium, copper
- Tube materials: any theoretical limit
‘KL’ FINNED TUBE
Manufactured exactly as the ‘L’ finned tube except that the base tube is knurled before application of the fin foot. After application, the fin foot is knurled into the corresponding knurling on the base tube thereby enhancing the bond between the fin and tube, resulting in improved heat transfer characteristics.
- Maximum working temperature: 260°c
- Atmospheric corrosion resistance: medium
- Mechanical resistance: medium
- Fin materials: aluminium, copper
- Tube materials: any theoretical limit
‘G’ EMBEDDED FINNED TUBE
The fin strip is wound into a machined groove and securely locked into place by back filling with base tube material. This ensures that maximum heat transfer is maintained at high tube metal temperatures.
- Maximum working temperature: 400°c
- Atmospheric corrosion resistance: low
- Mechanical resistance: medium
- Fin materials: aluminium, copper, carbon steel
- Tube materials: any theoretical limit
EXTRUDED FINNED TUBE
This fin type is formed from a bi-metallic tube consisting of an aluminium outer tube and an inner tube of almost any material. The fin is formed by rolling material from the outside of the exterior tube to give an integral fin with excellent heat transfer properties and longevity. Extruded fin offers excellent corrosion protection of the base tube.
- Maximum working temperature: 285°c
- Atmospheric corrosion resistance: high
- Mechanical resistance: high
- Fin materials: aluminium
- Tube materials: any theoretical limit
Fin Type Selection
L Type Finned Tube
The fin strip is wrapped under controlled tension to achieve tight contact with the base tube, improving heat transfer performance. The fin foot also provides additional protection to the base tube surface. Your current page states a maximum working temperature of 150°C, with medium atmospheric corrosion resistance and low mechanical resistance for this type.
LL Type Finned Tube
The fin foot overlaps to fully enclose the base tube, providing stronger corrosion protection than standard L type fins. The page currently lists a maximum working temperature of 180°C, high atmospheric corrosion resistance, and low mechanical resistance.
KL Type Finned Tube
The base tube is knurled before fin application, which improves the mechanical bond and heat transfer characteristics. The page currently lists a maximum working temperature of 260°C, medium atmospheric corrosion resistance, and medium mechanical resistance.
Embedded (G) Finned Tube
The fin strip is inserted into a machined groove and locked in place, ensuring stable performance at elevated tube metal temperatures. The page currently lists a maximum working temperature of 400°C, low atmospheric corrosion resistance, and medium mechanical resistance.
Extruded Finned Tube
An extruded fin is formed from a bi-metal tube, creating an integral fin with excellent heat transfer performance and long service life. The page currently lists a maximum working temperature of 285°C, high atmospheric corrosion resistance, and high mechanical resistance.
Features
- High heat transfer efficiency
- Strong mechanical bonding between fin and base tube
- Enhanced corrosion resistance
- Available for a wide range of operating temperatures
- Multiple fin structures for different service conditions
- Suitable for straight tubes and U-tubes
- Compatible with stainless steel, nickel alloy, copper alloy, and titanium base tubes
- Custom sizes available for project requirements
Technical Specifications
| Product Name | L Type, LL Type, KL Type, Embedded (G), Extruded Finned Tubes |
| Base Tube | TP304/304L/TP316/316L, UNS N08904 (904L), EN 1.4301/1.4307/1.4401/1.4404, UNS S32205/S31803/S32750/S32760, Titanium Gr.2/Gr.5, Nickel 200/201, Monel 400, Inconel 600/601/625, Incoloy 800H/800HT, Hastelloy C22/C276, UNS C11000/C44300/C70600/C71500 |
| Outer Diameter | 16 – 219 mm |
| Wall Thickness | 1 – 8 mm |
| Length | 1000 – 22000m |
| Fin Materials | AA1050, AA1060, AA1080, AA1100, UNS C10100/C11000 |
| Fin Height Range | 6 – 30mm |
| Fin Thickness Range | 0.2-0.6mm |
| No. of Fins per Inch/Fin Pitch | 8 – 16 FPI |
| No. of Fins per Meter/Fin Pitch | 250 – 500 FPM |
| Shape of Tubes | Straight Tube, U-Tube. |
| Packing Details | Tube ends are covered with plastic caps and packed in wooden boxes or steel frame boxes. |
| Place of Origin | Made in China |
| MOQ | 3 Tons/Size |
| inspection Certificate | EN 10204:2005 Type 3.1, EN 10204:2005 Type 3.2 by SGS, BV, TUV |
| Transportation | Railway, By Sea |
Applications
Finned Stainless Steel Tubes
- Air-cooled heat exchangers
- Shell-and-tube heat exchangers
- Waste heat recovery systems
- Boiler economizers
- Petrochemical process equipment
- HVAC and thermal management systems
Finned Nickel and Nickel Alloy Tubes
- Chemical processing plants
- Acid handling systems
- Chlorine service
- Marine seawater heat exchangers
- Aerospace and defense thermal systems
Finned Copper Alloy Tubes
- Air conditioning and refrigeration
- Electronics cooling
- Automotive radiators and oil coolers
- Compact heat exchange systems
Finned Titanium and Titanium Alloy Tubes
- Desalination plants
- Seawater heat exchangers
- Nuclear power systems
- Pharmaceutical and food processing equipment
