EN 10217-7 1.4301 Extruded Fin Tubes For Air Coolers Heat Recovery
Extruded Fin Tube: EN 10217-7 1.4301 Base Tube + AL Fins
Base Tube & Fin Synergy
Our extruded fin tubes feature a robust EN 10217-7 1.4301 (AISI 304) stainless steel base tube integrally bonded to 99.5% pure aluminum fins via cold extrusion. This design maximizes thermal conductivity (AL fins: 237 W/m·K) while leveraging the base tube’s corrosion resistance for harsh environments (e.g., acidic/chloride exposure).
Manufacturing Excellence
- Base Tube Fabrication:
- Cold-drawn seamless tubing per EN 10217-7, annealed for stress relief.
- Surface cleaned via pickling/passivation.
- Fin Extrusion:
- Aluminum fins extruded at 350–400°C under 1,500–2,000 psi pressure.
- Metallurgical bond formed without filler material (bond strength >35 MPa).
- Quality Validation:
- Helium leak testing (sensitivity: 1×10⁻⁹ mbar·L/s).
- 100% eddy current inspection for fin adhesion integrity.
Chemical Composition
Guaranteed Material Purity for Performance Longevity
| Component | Base Tube (1.4301) | Fins (AL 1050) |
|---|---|---|
| Carbon (C) | ≤0.07% | - |
| Chromium (Cr) | 17.5–19.5% | - |
| Nickel (Ni) | 8.0–10.5% | - |
| Aluminum (Al) | - | ≥99.5% |
| Iron (Fe) | Balance | ≤0.4% |
| Silicon (Si) | ≤1.0% | ≤0.25% |
Dimensional Tolerances
Precision Metrics for Seamless Integration
| Parameter | Base Tube Tolerance | Fin Tolerance |
|---|---|---|
| Outer Diameter | ±0.10 mm | ±0.15 mm |
| Wall Thickness | ±10% | N/A |
| Fin Height | N/A | ±0.20 mm |
| Fin Density | N/A | 4–10 FPI* (±0.5) |
| Straightness | ≤1.5 mm/m | ≤2.0 mm/m |
| *FPI = Fins Per Inch |
Critical Application Fields
- Chemical Processing:
- Sulfuric acid coolers, condenser bundles (resists pitting corrosion, Cr/Ni content).
- Power Generation:
- Air-cooled condensers (ACCs) for turbines (AL fins prevent frost accumulation).
- HVAC&R:
- Low-temperature evaporators (AL fins enhance defrost efficiency).
- Marine Engineering:
- Seawater desalination units (1.4301 resists chloride-induced stress corrosion).
Advantages & 15+ Years Expertise
Thermal Efficiency: 5–8x higher heat flux vs. bare tubes (fin surface area ratio: 15–25:1).
Corrosion Resistance: Base tube passes ASTM A262 Practice E (intergranular corrosion test).
Mechanical Durability: Fin pull-off strength >50 N/mm (per ASTM E8).
Customization: 50+ SKUs (OD: 15–50 mm; fin height: 3–20 mm; lengths ≤20 m).
Why Partner With Us?
- ISO 9001-certified manufacturing with EN 10217-7 compliance.
- 200+ projects delivered globally (EU, MENA, ASEAN).
- Lifetime technical support & material certification (MTC 3.1 per EN 10204).
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.