Cast Iron Finned Tube Manufacturer and Supplier in China
What are cast iron finned tubes?
Cast iron finned tubes are the core component of energy-saving economizers. Through the combination of cast iron material and finned structure design, they achieve highly efficient waste heat recovery.
Cast Iron Finned Tube Structural Features
Fin Design: The surface is wavy or serrated, disturbing flue gas flow and enhancing heat exchange.
Material Selection: Gray cast iron or ductile iron, possessing both wear resistance and corrosion resistance.
Cast iron finned tubes mainly consist of two parts: a cast iron base tube and fins. The base tube is made of high-quality cast iron, which has excellent casting properties and can be cast into various complex shapes to meet the needs of different economizer structural designs.
Cast iron possesses high strength and hardness, exhibiting excellent performance in withstanding thermal and mechanical stresses. This ensures that during long-term operation of the economizer, the base tube will not deform or be damaged due to pressure, temperature changes, or other factors, providing a reliable guarantee for the stable delivery of the heat medium.
Quality Control for Cast Iron Finned Tube
The quality of cast iron finned tube is assured by hydrostatic or aerodynamic testing, eddy current testing and tensile testing to verify the mechanical bond between the inner tube and outer fins.
Delivery condition:
Tube ends are square cut, free burrs, internally dried and air blown clean.
Cast Iron Finned Tube
Top Features of Cast Iron Finned Tube
Material Characteristics and Structural Design of Cast Iron Finned Tubes
Composition and Performance
Cast iron has a high carbon content (2.11%-4%) and contains free graphite (flaky or spherical), resulting in high brittleness and low tensile strength, but excellent wear resistance and vibration damping capabilities. This characteristic makes it suitable for heat transfer applications requiring wear resistance or vibration tolerance, such as economizers in industrial boilers.
Fin Structure Optimization
Cast iron finned tubes improve heat transfer efficiency by increasing the fin surface area (e.g., spiral winding or casting processes). The fin spacing is typically 2.5-8mm, which can be adjusted according to cleaning requirements or heat exchange efficiency. Some products adopt streamlined designs (such as 180-degree elbows) to adapt to complex pipe layouts.
Customizable Cast Iron Finned Tube
We can customize the material, specification and length according to your requirements.Solve your problems anytime and anywhere. Customize fin tubes and equipment according to your needs. Provide free technical guidance. Welcome to customize with drawings, so that you can purchase without worries.
Cast Iron Finned Tube Package
Payment Terms:T/T, LC
Delivery: 15-30 days after payment
Marking: Standard + Steel Grade + Size + Heat No + Lot No
Package: Iron frame packing boxes and the desiccants are put into each package for continental transportation as well. or as required
Cast Iron Finned Tube Quality Checks
Each of our Cast Iron Finned Tube is subjected to stringent quality checks.Inspection and Tests Performed:
1.Chemical Composition inspection。
2.Mechanical Properties Test(Tensile Strength, Yield Strength, Elongation, Flaring, Flattening, Hardness, Impact Test).
3.Surface and Dimension Test.
4.No-destructive Test.
5.Hydrostatic Test.
Cast Iron Finned Tube Application
Cast iron finned tubes are core components in energy-saving and coal-saving devices, primarily used in boiler economizers and other equipment. They improve energy efficiency by increasing heat exchange area and enhancing heat exchange.
High-Efficiency Heat Exchange: The corrugated or serrated fin design on the surface of cast iron finned tubes significantly increases the heat exchange area, improving heat exchange efficiency by 30%-50% compared to ordinary smooth tubes.
High Temperature and Corrosion Resistance: Cast iron has excellent wear resistance and corrosion resistance, making it suitable for the complex environments of boilers with high temperatures, high dust levels, and corrosive gases.
Energy Saving and Consumption Reduction: By recovering waste heat from flue gas and preheating boiler feedwater, fuel consumption can be significantly reduced. For example, after the renovation of an industrial boiler, its thermal efficiency increased from 86.5% to 92.3%.
When high-temperature flue gas flows through finned tubes, heat is transferred to the low-temperature medium (such as boiler feedwater) inside the tube through the fins and tube wall. The spiral arrangement of the fins can disturb the flue gas, breaking the laminar boundary layer of the low-temperature flue gas, thus increasing the heat transfer coefficient by 40%-60%.
Cast iron material has excellent wear resistance and corrosion resistance, enabling stable operation in the high-temperature, high-dust, and corrosive gas environment of boilers. A reasonable fin spacing design ensures smooth flue gas flow while preventing ash accumulation and blockage.
Waste Heat Recovery: Finned tubes increase the heat exchange area, improving efficiency by 30%-50% compared to plain tubes, thus reducing boiler coal consumption.Cast iron finned tubes are widely used in industrial boiler economizers, adaptable to economizer systems of 1500-2000mm, with a pressure resistance of 1.0-3.0MPa. Their wear resistance is particularly suitable for waste heat recovery scenarios involving particulate matter in flue gas.
Cast iron finned tubes are widely used in energy-saving and economizer systems such as industrial boilers and power plant boilers. In thermal power plants, they significantly improve boiler thermal efficiency and reduce power generation costs; in chemical, metallurgical, and other industrial sectors, they save enterprises substantial amounts of energy and improve economic efficiency.
Cast Iron Finned Tubes for Boiler Economizers are manufactured using a one-piece casting process, resulting in high material density and heat capacity, and superior structural rigidity compared to modular designs. Cast iron exhibits excellent thermal stability, maintaining temperature fluctuations of less than 5°C under continuous high load conditions. Cast iron radiators demonstrate outstanding oxidation resistance, allowing for over 15 years of use in industrial environments. The surface of cast iron radiators can be treated with an anti-rust coating, extending maintenance intervals by three times.
Related Product
Cast Iron Finned Tube FAQs
A: Cast iron finned tube production line 2.
A: We can provide cast iron gilled tube samples for free.
A: After you confirm cast iron square gilled tubes sample details, the samples will be ready for delivery in 3-7days,and will be sent to you via express and arrive in 3-5days.
A: Cast iron tube can be customized, we can make the new thermoforming or extruding mode based on your drawings and we can sign a confidentiality agreement about your patented product, pls contact us for any further information.
A: Always a pre-production sample,before mass production;always final inspection before shipment.
Inspection & Guarantee Certificate is supplied with shipment, and the Third Party Inspection is available.