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| Brand Name: | Yuhong |
| MOQ: | 1PC |
| Price: | Negotiable |
| Payment Terms: | TT, LC |
| Supply Ability: | 10000 tons/month |
EN 10217-7 1.4301 Extruded Fin Tubes Manufacturing Process
Manufacturing Process Step 1: Base Tube Preparation Source EN 10217-7 certified 1.4301 stainless steel welded tubes Inspect for dimensional accuracy, surface defects, and chemical composition (per EN 10217-7) Clean and degrease tube surface to ensure optimal bonding
Step 2: Sleeve Installation Slide a thick-walled aluminum sleeve (muff) over the 1.4301 base tube Ensure precise alignment and concentricity for uniform fin formation
Step 3: Extrusion Process Heat sleeve to 150-200°C (optional, improves formability) Push the sleeved tube through a shaped die or rotating arbor with cutting discs Cold plastic deformation forces aluminum to flow into fin shape while bonding metallurgically with base tube Control fin height, spacing, and thickness via die design and extrusion speed
Step 4: Post-Processing Cut to required lengths (up to 13m) Deburr and clean fins to remove any extrusion residue Conduct quality checks: fin height/spacing measurement, bond strength testing, pressure testing Apply surface treatments (optional: passivation for enhanced corrosion resistance)
EN 10217-7 1.4301 Extruded Fin Tubes Key Advantages vs Other Fin Tube Types
| Feature | Extruded Fin Tube (1.4301) | Wrapped/Low-Fin Tube |
| Bond Strength | Metallurgical bond (no detachment risk) | Mechanical bond (risk of loosening under vibration) Thermal Resistance Near-zero contact resistance Higher contact resistance (reduced efficiency) |
| Corrosion Resistance | Fin protects base tube; aluminum forms oxide layer | Fin edges vulnerable to corrosion; potential crevice issues |
| Durability | Withstands thermal cycling and vibration | Lower fatigue life; fin damage more likely |
| Maintenance | Minimal; self-cleaning properties | More prone to fouling; requires frequent cleaning |
EN 10217-7 1.4301 Extruded Fin Tubes Applications:
| Industry Typical | Applications | Why It Works |
| Petrochemical/Oil & Gas | Air fin coolers, process coolers, gas compressors, offshore platforms | Corrosion resistance to hydrocarbons and saltwater; withstands thermal cycling |
| HVAC & Refrigeration | Evaporators, condensers, air-cooled chillers | High heat transfer efficiency; low maintenance |
| Power Generation | Air preheaters, gas turbines, cooling towers | Handles high temperatures and flue gas environments |
| Chemical Processing | Reactors, heat recovery systems, acid gas coolers | Resists corrosive process fluids |
| Food & Beverage | Pasteurizers, sterilization equipment, drying systems | Food-safe (1.4301 meets hygiene standards); easy cleaning |
| Marine | Engine cooling systems, seawater heat exchangers Superior resistance to saltwater corrosion | Engine cooling systems, seawater heat exchangers Superior resistance to saltwater corrosion |
| Medical | Sterilization equipment, pharmaceutical processing | Cleanability and corrosion resistance in sterile environments |
EN 10217-7 1.4301 Extruded Fin Tubes FAQs
Q1: What is EN 10217-7 and why is it important?
A: EN 10217-7 is the European standard specifying technical delivery conditions for pressure-rated welded stainless steel tubes. It ensures the 1.4301 base tube meets strict quality, safety, and performance requirements for use in boilers, pressure vessels, and piping systems.
Q2: Why use aluminum fins with 1.4301 stainless steel?
A: Aluminum offers excellent thermal conductivity (12x higher than 1.4301) while being cost-effective. The bimetallic combination balances corrosion resistance (1.4301) and heat transfer efficiency (aluminum).
Q3: What is the maximum operating temperature?
A: Limited by the aluminum fins to 285°C. For higher temperatures (>300°C), consider alternative fin materials like stainless steel or nickel alloys.
Q4: How is bond strength tested?
A: Common tests include:
Pull-off test: Measures force required to detach fins (minimum 100 MPa shear strength)
Torque test: Evaluates rotational resistance of fins around the base tube
Thermal cycling: Tests performance through repeated heating/cooling cycles (500+ cycles)
Q5: How does corrosion resistance compare to other materials?
A: 1.4301 stainless steel provides excellent resistance to oxidizing environments, organic acids, and mild alkalis. Aluminum fins form a protective oxide layer, enhancing overall corrosion resistance in outdoor/industrial settings. For chloride-rich environments, consider upgrading to 1.4404 (316L) base tubes.
