Application description

Widely used in heat recovery systems (economizers, waste heat boilers), air coolers (radiators, condensers, evaporators), industrial heat exchangers (shell-and-tube, fin-fan), power plant boilers, HVAC coils, and process heaters. Also suitable for petrochemical, refinery, and marine applications where enhanced heat transfer is required. The extended surface significantly improves thermal efficiency, allowing compact equipment design and reduced energy consumption.

Production description

Base tube is cleaned and fed through a finning machine. Metal strip (fin material) is helically wound around the tube under tension and continuously welded (high-frequency), brazed, or mechanically embedded. For extruded fins, a bi-metallic tube is passed through rolling dies to form integral fins. The finned tube is then cut to length, end fins removed (if required), inspected for fin density and bond integrity.

Shipping Packaging

For export, finned tubes are bundled with wooden separators, secured with steel straps, fitted with plastic end caps (to protect tube ends and fin tips), and packed on ISPM-15 pallets or in steel crates. Labels include base tube material, fin type, dimensions, length, and heat number for safe sea freight.

Why Choose Us?

Factory Strength:Direct manufacturer with high-frequency fin welding lines, brazing furnaces, and mechanical fin embedding equipment, producing finned tubes with base tube OD 16–273mm, fin height 5–25mm, fin pitch 3–20mm, and multiple fin types (spiral solid/serrated, extruded, longitudinally welded).

Quality Assurance:Strict control of fin-to-tube bond strength (welded ≥10 MPa), fin density, fin height consistency, and dimensional accuracy; 100% visual and non-destructive testing (eddy current or dye penetrant) available; compliant with ASTM A498, EN 12953, GB/T 24591, JB/T 6512.

Certifications & Reports:Mill test certificates (MTC) for base tube and fin materials with each shipment; third-party inspections (SGS, BV) and heat transfer performance tests upon request.

Customization & Service:Wide range of base tube materials (carbon steel, stainless steel, alloy steel, copper) and fin materials (aluminum, carbon steel, stainless steel, copper), custom fin patterns, tube lengths up to 20m, end preparation (plain, beveled, fin-free zones), and fast lead times for heat exchanger applications.

Export Packaging:Wooden separators + steel strapping + plastic end caps (tube and fin protection) + ISPM-15 pallets/steel crates + clear labeling for safe sea freight and damage-free delivery.

FAQ

1. How to store finned tubes to prevent fin damage and corrosion?

Store on level, dry ground on wooden sleepers or pallets, with tubes supported along their length. Avoid stacking heavy loads that could crush or bend fins. Keep plastic end caps on tube ends to protect threads and fin tips. For long-term storage, apply rust preventive oil (carbon steel base) and store under cover. Do not roll or drop tubes to prevent fin deformation.

2. Which fin type (spiral solid, spiral serrated, or extruded) should I choose for my heat exchanger application?

Spiral solid fins provide maximum heat transfer area and are economical, suitable for clean air or gas service. Spiral serrated fins have cut edges that improve turbulence and reduce fouling, ideal for dusty or oily exhaust streams. Extruded (bi-metallic) fins have an integral aluminum fin with a mechanical bond, offering excellent corrosion resistance and high temperature capability (≤250°C for aluminum), often used in air coolers and fin-fan units.

3. What is the maximum operating temperature for different fin and base tube combinations?

Aluminum fins on carbon steel or stainless steel tube: ≤250°C (above this, aluminum softens and loses bond). Carbon steel fins on carbon steel tube: ≤450°C (welded or embedded). Stainless steel fins on stainless steel tube: ≤650°C. For high-temperature applications (boilers, waste heat recovery), choose stainless steel fins with high-frequency welded attachment to ensure bond integrity and thermal cycling resistance.