Cast Iron Fin Tube

Cast Iron Finned Tube: Technical Documentation

What is Cast Iron Fin Tube?

Cast iron fin tubes are mainly composed of cast iron base tubes and fins. The base tube is made of high-quality cast iron material. Cast iron has good casting properties and can be cast into various complex shapes to meet the needs of different economizer structural designs. At the same time, cast iron has high strength and hardness, and performs well in withstanding thermal and mechanical stresses. It can ensure that during the long-term operation of the economizer, the base tube will not be deformed or damaged due to factors such as pressure and temperature changes, providing reliable guarantee for the stable transportation of heat medium.

In the field of energy utilization and industrial production, energy-saving economizers are important equipment for improving energy utilization efficiency and reducing fuel consumption. The performance of energy-saving economizers directly affects the economy and environmental protection of the entire system. As the core component of energy-saving economizers, cast iron fin tubes play an irreplaceable role in efficient heat exchange, energy saving and consumption reduction with their unique structure and excellent performance.

‌Definition and Structure‌

Cast iron finned tube is a heat transfer enhancement component formed by integrating cast iron base pipes with external fins through casting processes. Its core function is to expand heat exchange surface area through fins, improving thermal efficiency.

‌Production Process‌

1. ‌Casting Technology‌
   • Utilizes metal mold casting to form the base pipe and fins in one step, with mold precision directly impacting fin uniformity and pipe integrity.
   • The molten iron composition (carbon, silicon ratios) is controlled to ensure corrosion resistance and mechanical strength.
2. ‌Surface Treatment‌
   • Post-casting processes include sandblasting or polishing to remove oxides, followed by optional galvanization for corrosion protection.

‌Key Characteristics‌

1. ‌Material Properties‌
   • ‌Corrosion Resistance‌: Suitable for harsh environments (e.g., acidic or alkaline media);
   • ‌High Strength‌: Thick walls withstand pressures over 10 MPa;
   • ‌Cost-Effectiveness‌: Lower material costs compared to stainless steel or copper alloys.
2. ‌Structural Advantages‌
   • Zero contact thermal resistance between fins and base pipe, enhancing heat transfer efficiency;
   • Fins (straight or helical) increase surface area by 5-10 times compared to smooth pipes.

‌Application Fields‌

1. ‌Industrial Equipment‌
   • Boiler waste heat recovery systems, chemical reactor heat exchangers (high-temperature/pressure environments);
   • Industrial kiln flue gas heat recovery (acidic corrosion resistance).
2. ‌Municipal Infrastructure‌
   • Central heating radiators (high pressure resistance and durability);
   • Sewage treatment heat exchangers (humidity and corrosion resistance).
3. ‌Traditional Sectors‌
   • Greenhouse heating pipes, agricultural drying equipment (low maintenance and cost-effective).