EN 10217-7 1.4301 Stainless Steel and Aluminum Extruded Fin Tube
High-Efficiency Extruded Bimetallic Finned Tube: EN 10217-7 1.4301 Base Tube with Aluminum Fin
Product Overview Our Extruded Bimetallic Finned Tubes represent the pinnacle of heat transfer technology. Combining the superior corrosion resistance of an EN 10217-7 1.4301 (Stainless Steel 304) core tube with the exceptional thermal conductivity of an Aluminum (AL) outer fin, these tubes are engineered for demanding industrial environments. The seamless extrusion process ensures perfect mechanical bonding, offering long-lasting performance in heat exchangers, air coolers, and condensers.
Structure & Manufacturing Process of 1.4301 + AL Extruded Fin Tubes
The exceptional durability of our bimetal finned tubes comes from our advanced cold-extrusion manufacturing process.
- Core/Base Tube (EN 10217-7 1.4301): The inner tube is manufactured from high-grade welded stainless steel (1.4301 / SS 304) designed for pressure purposes, ensuring maximum resistance to internal corrosive fluids.
- Outer Fin (Aluminum): We use pure aluminum (typically Al 1060) due to its superior formability and heat dissipation capabilities.
- The Extrusion Process: An aluminum muff tube is slipped over the 1.4301 stainless steel base tube. The assembly is then fed through a rolling machine where three sets of disks extrude the aluminum to form the fins. This process creates a tight, permanent mechanical bond between the stainless steel and aluminum, completely sealing the base tube from the external atmosphere and preventing galvanic corrosion.
Chemical Composition: EN 10217-7 1.4301 Base Tube & Aluminum Fin
To meet stringent international engineering standards, we strictly control the raw materials. Below is the chemical composition of the core tube and the fin material.
Table 1: Base Tube Material - EN 10217-7 1.4301 (X5CrNi18-10)
| Element | Carbon (C) | Silicon (Si) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Chromium (Cr) | Nickel (Ni) |
|---|---|---|---|---|---|---|---|
| Max / Range (%) | ≤ 0.07 | ≤ 1.00 | ≤ 2.00 | ≤ 0.045 | ≤ 0.015 | 17.50 - 19.50 | 8.00 - 10.50 |
Table 2: Fin Material - Aluminum (Grade 1060/1100)
| Element | Aluminum (Al) | Copper (Cu) | Iron (Fe) | Silicon (Si) | Zinc (Zn) |
|---|---|---|---|---|---|
| Content (%) | ≥ 99.60 | ≤ 0.05 | ≤ 0.35 | ≤ 0.25 | ≤ 0.05 |
Dimensions & Tolerance Range for 1.4301 / AL Finned Tubes
Precision is critical in heat exchanger assembly. We offer highly customizable dimensions with strictly controlled tolerances to ensure perfect fitment.
| Parameter | Standard Range | Manufacturing Tolerance |
|---|---|---|
| Base Tube Outer Diameter (OD) | 15.88 mm to 50.8 mm | ± 0.15 mm |
| Base Tube Wall Thickness | 1.5 mm to 4.0 mm | ± 10% |
| Fin Outer Diameter | 25.0 mm to 76.0 mm | ± 0.50 mm |
| Fin Height | 7.0 mm to 17.0 mm | ± 0.30 mm |
| Fin Thickness | 0.2 mm to 0.4 mm | ± 0.05 mm |
| Fin Pitch (Fins per inch) | 5 FPI to 11 FPI | ± 2% |
| Unfinned End Length | As per customer request | ± 2.0 mm |
| Maximum Tube Length | Up to 15,000 mm | + 5.0 mm / - 0 mm |
Performance Advantages of 1.4301 Stainless Steel + AL Extruded Fin Pipes
- Zero Contact Resistance: The cold-rolling extrusion process guarantees a 100% mechanical bond, ensuring zero loss of heat transfer efficiency even at elevated temperatures (up to 280°C - 300°C).
- Unmatched Corrosion Protection: The aluminum fin material completely encases the 1.4301 stainless steel base tube. This "sacrificial anode" effect and physical barrier protect the core tube from external atmospheric corrosion.
- High Structural Integrity: Unlike wound or L-footed fins, extruded fins are integral to the outer aluminum sleeve. They will not loosen, deform, or peel off during vibration, high-pressure washing, or thermal cycling.
- Hygienic Internal Surface: The EN 10217-7 1.4301 core offers excellent hygiene and cleanability, making it suitable for sanitary and food-grade applications.
Detailed Application Areas for EN 10217-7 1.4301 Bimetallic Finned Tubes
Due to the premium material combination, these fin tubes are widely specified by engineering firms across various industries:
- Petrochemical & Oil Refineries: Used in air-cooled heat exchangers (ACHE) where corrosive internal fluids are cooled by ambient air.
- Power Generation: Essential components in condenser cooling systems and exhaust gas recovery.
- Food & Beverage Processing: The 1.4301 (SS304) inner tube guarantees food safety, widely used in drying, heating, and pasteurization equipment.
- HVAC Systems: Industrial heating and air conditioning coils requiring high durability and thermal efficiency.
Why Choose Us as Your Bimetallic Finned Tube Manufacturer?
With over a decade of experience in manufacturing heat transfer solutions, we are not just a supplier; we are your technical partner.
- Strict Quality Control (QC): Every EN 10217-7 1.4301 base tube undergoes Eddy Current Testing (ECT) and Hydrostatic testing before extrusion. Post-extrusion, we perform meticulous dimensional checks and visual inspections.
- Advanced Manufacturing: Our imported extrusion machines ensure consistent fin pitch and completely wrinkle-free fin bases, maximizing air flow dynamics.
- Export-Ready Packaging: To prevent fin damage during long-distance shipping, all tubes are packed in robust, fumigated wooden cases with custom internal wooden supports and desiccants to prevent oxidation.
- Custom Engineering: We support OEM/ODM. Whether you need specific unfinned ends, customized lengths, or specialized testing reports (EN 10204 3.1 Certificate), our engineering team is ready to deliver.
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Have questions about our products or want to discuss a custom order? Our team is ready to help you.