Customized SS304 Seamless Tube with Aluminum 1060 Fins Successfully Manufactured and Delivered
Project Overview
In June 2026, Datang Finned Tube successfully completed the custom manufacturing, rigorous quality inspection, and export delivery of 900 pieces of customized KLL-type finned tubes for a major industrial client in Iraq.
The project required high-precision integration of 8,000 mm long SS304 seamless stainless steel base tubes with high-purity Aluminum 1060 fins. Specially engineered for critical industrial heat transfer equipment operating in demanding thermal environments, all 900 units were manufactured to exact specifications and dispatched on June 22, 2026.
Project Facts
-
Destination Country / Region: Iraq
-
Product Type: KLL Type Finned Tube (Knurled L-Foot)
-
Order Quantity: 900 Pieces
-
Base Tube Material: Stainless Steel 304 (Seamless)
-
Base Tube Outer Diameter (OD): 25.4 mm
-
Base Tube Average Wall Thickness: 2.77 mm
-
Fin Material: Aluminum 1060 (Al1060)
-
Fin Outer Diameter (OD): 57.15 mm
-
Fin Thickness: 0.4 mm
-
Fin Density: 10 FPI (Fins Per Inch)
-
Bare Length: 100 mm / 100 mm (Both Ends)
-
Overall Length: 8,000 mm (8 Meters)
-
Tube Ends Condition: Plain Ends
Customer Requirements
Manufacturing 8-meter long, high-performance composite finned tubes while maintaining batch consistency across 900 units requires strict process control:
1. Superior Mechanical Bonding (KLL Knurling Technology)
To prevent fin loosening caused by thermal expansion differences between the SS304 base tube and Al1060 fins under operating temperature fluctuations, our production line utilized advanced KLL knurling technology. Before fin application, the outer surface of the base tube was pre-knurled, and the aluminum fin foot was rolled into the knurled grooves. This process guarantees a tight mechanical bond, maximizes heat transfer efficiency, and enhances resistance to mechanical vibration.
2. Precise Bare-End Tolerances
The client specified exact 100 mm bare tube sections at both plain ends for site tube-sheet welding and header connection. Automated measurement systems were deployed along the 8-meter line to ensure accurate length tolerances and zero fin-margin deviation across all 900 pieces.
For customized finned tube projects, maintaining consistency throughout the entire production batch is critical.
Datang Finned Tube worked closely with the customer to ensure that the manufacturing process matched the required specifications.
KLL Type Finned Tubes Manufacturing Process
The production of long-length finned tubes requires precise control of the finning process and careful handling throughout manufacturing.
For this project, Datang Finned Tube focused on:
- Stable fin forming process
- Uniform fin spacing
- Consistent tube dimensions
- Accurate bare-end control
- Product appearance and surface protection
The production team monitored the process to ensure that the finished tubes maintained consistent quality from the first piece to the final piece.
900 Pieces of Long-Length KLL Finned Tubes Completed
After production, the completed finned tubes were arranged for inspection and preparation for shipment.
The project included 900 pieces of long-length KLL type finned tubes, demonstrating Datang Finned Tube’s capability to handle customized orders with strict technical requirements.
The finished products showed:
- Uniform fin arrangement
- Consistent tube appearance
- Proper bare tube sections
- Professional handling of long-length tubes
Before dispatch, every batch passed multi-point quality inspections covering:
-
Dimensional Verification: Verification of base tube OD (25.4 mm), wall thickness (2.77 mm), fin OD (57.15 mm), and 10 FPI density.
-
Surface & Visual Checks: Inspection for uniform fin alignment, clean bare ends, and defect-free aluminum surfaces.
Quality Control Before Shipment
Before shipment, the finished products were checked according to the customer’s requirements.
The quality control process focused on:
- Product dimensions
- Fin appearance
- Tube condition
- Manufacturing consistency
For customized finned tubes, dimensional accuracy and product consistency are essential to ensure smooth installation and reliable performance in customer equipment.
Professional Packing for Export Shipment
Long-length finned tubes require professional packing to protect the fins and tube surfaces during transportation.
After completing production and inspection, the 900 KLL type finned tubes were carefully arranged and packed for international shipment.
The packing process was designed to:
- Protect the fin surfaces
- Prevent damage during handling
- Keep tubes organized during transportation
- Ensure safe delivery to the customer’s destination
To prevent damage to the 0.4 mm aluminum fins and avoid tube bending across the 8-meter length during international transit:
-
Layer Interspicing: Protective comb spacers were placed between tube layers to prevent fin deformation.
-
Structural Framing: Heavy-duty, steel-reinforced export crates were built to prevent sagging during crane lifting.
-
Moisture Protection: Full waterproof plastic wrapping was applied to withstand ocean shipping and ambient humidity shifts.
Video: KLL Finned Tube Production and Packing Process
The video shows the actual manufacturing and packing process of the KLL type finned tubes supplied to the Iraq customer.
From production equipment operation to finished tube packing, the video provides a complete view of the project execution process.
Why Choose Datang Finned Tube?
Datang Finned Tube provides custom-engineered heat exchanger tube solutions for oil & gas, petrochemical, power generation, and HVAC industries worldwide:
-
Comprehensive Fin Configurations: KLL, KL, L-Foot, Extruded (Bi-Metal), Embedded G-Type, and High-Frequency Welded (HFW) finned tubes.
-
Versatile Material Combinations: Carbon Steel, Stainless Steel (304/316/316L), Duplex Steel, Copper Alloys, and Aluminum.
-
Global Project Execution: High-volume production capability, strict quality assurance, and heavy-duty export packaging standards.
Need Custom Finned Tubes for Your Next Project?
Contact our engineering team today to submit your technical specifications or request a quick quotation.
