Fin tube(Finned tube) is used in applications involving the transfer of heat from a hot fluid to a colder fluid through a tube wall.
Download PDFSpiral wound finned tubes are designed to maximize heat transfer efficiency in various industrial applications.
The trapezoidal section formed by rolling L-shaped finned tube is consistent with the distribution of heat flow density, and the tubes are closely combined with high thermal efficiency, thus eliminating the contact thermal resistance caused by the gap between the fins. Working temperature: 230'℃ Characteristics: winding process, high production efficiency, uniform spacinggood heat transfer, high fin ratio, the base tube can be protected from air erosion.
LL type spiral wound fined tube: on the basis of L-ype, the root of the fin is completely covered on the outer surface of the base tube, which canstrengthen the contact surface and increase the heat transfer effect. Maximum working temperature: 170 ℃.
KL type fin tube, also known as knurled fin tube, is to roll the pattern on the base tubebefore winding the fin, or install a blade on the winding machine to knurl on the base tube.and the back blade is used for winding, knurling and winding at the same time.The maximum service temperature is<250℃, and the maximum service pressure is <3.2Mpa.
The extruded fin is formed from an outer thick-walled aluminium tube (muff) aligned over an inner base tube. The two tubes are pushed through three mandrels with rotating discs that literally squeeze or extrude the aluminium fins up and out of the muff material in a spiral shape in one operation.
The processing technology of cold rolled aluminium steel finned tube isthat aluminium tube and steel tube are first processed into bimetallic composite tube, and then the fin is formed after mechanical cold rollingBased on the physical characteristics of aluminium tube, the finned tube with steel tube as the core and aluminium fin formed by cold rolling are made into one. lt is widely used in steel, petroleum, chemical industry.machinery, shipbuilding, power station, hospital and food industry.
Single metal composite finned tube is rolled from aluminium tube as a whole. Pure aluminium rolling finned tube has no contact thermal resistance, high strength, heat resistance and mechanical vibration, good thermal expansion performance and considerable expansion heat exchange surface.
Copper finned tube is a type of heat exchanger element. In order to improve the heat exchange efficiency, fins are usually added on the surface of the heat exchange tube to increase the external surface area (or internal surface area) of the heat exchange tube, so as to achieve the purpose of improving the heat exchange efficiency. The integral rolling fin tube has no contact thermal resistance, good heat transfer performance, high strength, heat resistance and mechanical vibration resistance, and good thermal expansion performance.
Copper-aluminium composite finned tube is made of copper-aluminium composite tube after compounding and then rolled. It has the characteristics of close combination, small thermal resistance, good heat transfer performance, high strength, small flow loss, strong corrosion resistance, low deformation and long working life under long-term cold and heat conditions. When wet cooling is carried out in heating and air conditioning,condensation water on the surface of fin is easy to beremoved,and it is not easy to form dust and scale in coaxial heating and other heat exchange occasions.
The fins are manufactured by embedding the fin strip into a groove formed on the base tube.
The Fin is allowed to be placed in the groove and then the backfilling of the groove is carried out to ensure firm adherence of the fins to the base tubes.
Spiral wound finned tubes find extensive applications in various industries due to their excellent heat transfer capabilities and durability. Some of the key industries where they are commonly used include:
Corrugated heat exchange tubes are widely used in various industries for efficient heat transfer and thermal management.
Low Thread Finned Tube is a high efficiency heat exchanger tube rolled to form spiral fins on its outer surface.
The spiral fin enlarges heat transfer area, disrupts laminar flow, reduces boundary layer thickness, and improves boiling and condensation heat transfer efficiency.
T-type finned tubes suit clean shell-side media without solid particles or gums, improving boiling heat transfer.
Corrugated tubes replace straight tubes with stronger corrosion resistance, longer service life, and automatic descaling capability.
Turbulent flow continuously cleans tube surfaces, preventing scale buildup and ensuring stable long-term performance.
Ultra-thin stainless steel walls reduce weight, footprint, and overall cost while maintaining excellent mechanical strength.
Expansion wave tubes are specialized components designed for high-efficiency heat exchange under variable thermal stress.
Wave crest and trough design creates continuous turbulence, increasing heat transfer coefficient 2–3× compared to traditional tubes.
Turbulence prevents particle deposition; thermal expansion causes automatic scale shedding, ensuring long-term performance.
Structural flexibility reduces thermal stress without requiring additional expansion joints.
Short sealing perimeter and wave geometry improve reliability under large temperature and pressure differences.
Our welded finned pipes are used in the power generation, petrochemical, oil refining industries and in industrial processing equipment and can be manufactured to meet ASME "U" and "S" stamp certifications.
Spiral high frequency welding finned tubes are specialized tubes used in various industries for heat transfer applications.
Our flexible production scheduling provides quick product turnaround, allowing you to minimize downtime during emergency repairs or scheduled downtime when ordering replacement parts, or to meet production schedules when ordering OEM parts.
Studded tubes have studs welded to the metal tube. These studs are arranged in a specific formation along the length of the tube. They are commonly used in boilers and refineries. As they increase the surface area for higher heat transfer, they are used for reheating.
The nail head tube is also called nail like ribbed tube. In petrochemical industry, nail head tube is widely used. Especially in the convection chamber of the tube furnace, in order to improve the heat transfer effect outside the tube, the heat transfer element often adopts the nail head tube.
Serrated spiral high frequency welding finned tubes are specialized heat transfer components designed for efficient heat exchange in various industrial applications.
Cold-wound finned tubes are heat exchanger tubes made by wrapping a metal strip around a base tube to create a helical finned structure.
The fins increase the tube's surface area, which improves heat transfer. Cold-wound finned tubes are used in many industrial applications.
According to the material, there are carbon steel (or stainless steel) winding aluminium sheet.carbon steel winding carbon steel sheet, stainless steel winding stainless steel sheet, thewinding segment spacing is about 4mm, and the common sizes of strip steel (aluminium sheet.carbon steel sheet, stainless steel sheet) are sheet height of 10mm, 12mm, 15mm, etc., sheet thickness of 0.35mm, etc., and sheet spacing of 4mm, 5mm, 6mm, etc. can also be customized according to customer requirements.
Elliptical Finned Tube is an elliptical seamless tube with a base tube that has aluminium fins or copper fins wrapped spirally and tightly around the outer surface of the base tube under tension.
The finned tube is connected to the pipe piece by piece. As the tube is often not round (especially welded steel tubes), there is inevitably a gap between the fin and the tube wall. lf there is a gap, there is a gap thermal resistance. For this reason, the following measures are often used: resistance welding method, dip coating method, contact welding method and tube expansion method.
The utility model provides a technology to make the tube and fin close together and improve heat dissipation. lt prefabricates the inclined edge hole on the string piece to reserve the interference material, and then retracts it to make the tube and fin form the extrusion of contour peak and contour valley. It can realize the seamless combination under the normal temperature condition without welding, sticking and filing other materials, so as to make it a high efficiency heat sink. In radiator, heat exchanger, shower water heater and so on, this technology can save tin and chemical adhesive.
Longitudinally finned tubes are made by resistance-welding fins along the length of the tube.
The fins first form a U-shaped channel so that each U-leg forms a fin. The channel is cut to length, aligned and resistance welded along the length of the tube. The channel is welded in pairs, opposite each other, so the number of fins specified must be a multiple of four.
The isolation ring is suitable for aluminum finned tube, extruded finned tube and L/ll / KL finned tube, and ismost commonly used in G-based finned tube.
Material: aluminum,galvanized steel, stainless steel
Size: O.D.:63.5mm, O.D.:73.5mm,etc
Used to fin type: L. LL. KL. G-type finned tube
Shape: round, hexagonal, octagonal.
Embedded aluminum finned tube circular spacer box.
The general flexible core tube of finned tube: the outerdiameteris 25.4mm，31.75mm and 38.1mmrespectively
Be installed on fin
Display at the joint
Steel radiator has the characteristics of compact structure, good air tightness and convenient installation. It is suitable for both steam system and hot water system. lt is widely used in air heating system of heating ventilation and drying equipment in large buildings.Structural Specification:The steel radiator is manufactured andproduced according to the standard atlas, which is composed of carbon steel frame and carbon steel cooling pipe (carbon steel heat pipe). The steel radiator is fixed by frame, with compact structure, good air tightness and convenient installation.Working medium:steam(<1.0MPa),hot water(<130℃).
Aluminium finned tube air heater is a new type of air heater improved on the basis of steel finned tube air heater. The heat exchange element of the product is made of steel tube .Aluminium "L" type finned tube, and the working temperature can reach 230℃. lthas the advantages of tight contact, no wrinkle, no dust accumulation, good vibration resistance, and can protect the tube from air erosion. Compared with the steel radiator, the heat dissipation area is increased by 10.20%, the weight is reduced by about 30%, and the heat can be increased by 10-20% under the same working conditions. lt is suitable for steam and hot water systems.lt can be widely used in air heating, material drying and air conditioning systems.
The heating medium of the radiator is steam or hot water, the working pressure of steam is 2.6 MPa, and the temperature of hot water is 70-130℃.
We offer you a broad portfolio of materials and can expand our offerings at any time to meet your specific needs regarding thermal conductivity, mechanical properties, or corrosion resistance.
For Aluminum L-Foot finned tubes, the fin material is aluminum, either 1100-0. The tube material is generally carbon steel, stainless steel, or brass; however the tube can be of any material.
For Welded Helical Solid and Welded Helical Serrated finned tubes, the fin and tube materials can be any combination that can be welded together using HIGH FREQUENCY WELDING process.
The materials chosen for a given application are a function of service temperature, corrosive environment, and/or erosive environment. Common tube materials used for our welded product lines include: carbon steel, carbon moly, chrome moly, stainless steel, Inconel, and Incoloy. Common fin materials include: carbon steel; stainless steels of types 304, 310, 316, 321, 409, and 410; Nickel 200, and Inconel.
We offer you a broad portfolio of materials and can expand our offering at any time to meet your specific needs regarding thermal conductivity, mechanical properties, or corrosion resistance.
| Material | Grade |
|---|---|
| Carbon Steel Tubes | A179, A192, SA210 Gr A1/C, A106 Gr B, A333 Gr3 Gr6 Gr8, A334 Gr3 Gr6 Gr8, 09CrCuSb, DIN 17175 St35.8 St45.8, EN 10216 P195 P235 P265, GB/T3087 Gr10 Gr20, GB/T5310 20G 20MnG, |
| Alloy Steel Tubes | A209 T1 T1a,A213 T2 T5 T9 T11 T12 T22 T91,A335 P2 P5 P9 P11 P12 P22 P91,EN 10216-2 13CrMo4-5 10CrMo9-10 15NiCuMoNb5-6-4 |
| Stainless Steel Tubes | TP304/304L, TP316/TP316L TP310/310S TP347/TP347H |
| Copper Tubes | UNS12200/UNS14200/UNS70600, CuNi70/30, CuNi 90/10 |
| Titanium Tubes | B338 Gr 2 |
Ребристая труба для отопления на свинокомплексах и птицефабриках
Отопительные трубы с ребрами обеспечивают хорошую теплопередачу, благодаря абсолютно жесткой посадке плоского ребра на внутренней трубе. Наши отопительные трубы с ребрами применяются везде, где особые условия монтажа требуют использования необычных решений, например, в фасадных системах отопления, на многоярусных складах, в теплицах, при защите стеклянных куполов от запотевания и т.д., также трубы используются для отопления жилых, промышленных и складских помещений. Имеют документированную высокую степень теплоотдачи.
Ребристые трубы монтируются при помощи стандартных фитингов, либо под сварку по желанию Заказчика.
Мы изготавливаем два типоразмера ребристой трубы :
Ду32 и Ду40.
Длину трубы определяет Заказчик.
Покрытие трубы:
-грунт
-порошковая окраска
-горячий цинк.
По ценам и срокам изготовления вы можете узнать, позвонив по телефону
It is fabricated with a batch of single fins that were processed by the punch press and then manually or mechanically, with a certain distance (wingspan) on the base tube.
This is the earliest fin tube fabrication with low cost and simple production process/ technology, easy to maintain. Divides into manual set and mechanical set. Manual set uses a tool that relies on the power of man to press the fins one by one. This method is limited by the pressure of the fin, so it is easy to get loose. The machine – set fin is carried on the wing piece machine. Due to the mechanical impact or liquid pressure, the pressure of the fin is high, so it can be used in a larger volume. The bonding strength between fin and tube is high and not easy to loosen. Mechanical transmission has high productivity, but the noise is large, the safety is poor, and the working conditions of the workers are not good. Although the hydraulic transmission does not have the above problem, but the equipment price is more expensive, the technical requirement to use maintenance personnel is higher, its productivity is also lower.
Currently HF Fin Tube is one of the most widely used helical fin tubes, you can see it as waste heat recovery in power, metallurgy, concrete, oil and gas, petrochemical, etc. When winding the steel strip around steel tube, the use of high frequency current skin effect and proximity effect on steel strip and steel pipe surface heating, until the plastic state or melt, the coil steel belt must be under pressure to complete welding. Comparing with embedded type and spot welding spiral crimped type, it is more advanced either on fin tube quality or production efficiency or automation degree.
The extruded fin is formed from an outer aluminum tube with a large wall thickness (muff), which is aligned over an inner base tube. The two tubes are pushed through three arbors with rotating discs that literally squeeze or extrude the aluminum fins up and out of the muff material in a spiral shape in one operation. Comparing with welding fin tube, dr extruded fin has higher production efficiency with low cost on material and high heat transfer. At present, it divides into copper or aluminum single metal fin tube and bi-metal composited fin tube.
Fin tube manufacturers produce a wide range of fin tubes. They are used in heat exchangers (air, water and chemically cooled) for various industries such as petroleum, petrochemical, steel, power generation and many more.
Corrosion protection processes are performed during fin tube manufacturing and the material used is corrosion resistant. Some fin tube types are:
Helical high finned tubes are used to repair air-cooled heat exchangers and are available in 5 variations
| Type | Photo | Descriptions | Properties |
|---|---|---|---|
| "KL" fin tubes |  |
After application the fin foot is knurled into the corresponding knurling on the base tube thereby enhancing the bond between the fin and tube resulting in improved heat transfer characteristics. Max. operating. temp. 260ºC | Max working temperature – 260 °C (500 °F) Atmospheric corrosion resistance – acceptable Mechanical resistance – acceptable Fin material – aluminum, copper |
| "G" fin tubes |
|
Fin strip is wound & embedded on a groove and securely locked by closing the groove with the base tube metal. This ensures maximum heat transfer at high temperatures. Max. operating temp. 450ºC |
Max working temperature – 400 °C (752 °F) Atmospheric corrosion resistance – poor Mechanical resistance – acceptable Fin material – aluminum, copper, carbon steel |
| "LL" fin tubes |
|
Manufactured in the same way as the ‘L’ fin type except that the fin foot is overlapped to completely enclose the base tube thereby giving excellent corrosion resistance. This type of tube is often used as an alternative to the more expensive extruded type fin in corrosive environments. Max. operating. temp. 180ºC | Max working temperature – 180 °C (356 °F) Atmospheric corrosion resistance – acceptable Mechanical resistance – poor Fin material – aluminum, copper |
| "L" fin tubes | 
|
The strip material is subjected to controlled deformation under tension giving the optimum contact pressure of the foot of the fin onto the base tube thus maximizing the heat transfer properties. The foot of the fin considerably enhances the corrosion protection of the base tube. Max. operating. temp. 150ºC | Max working temperature – 150 °C (302 °F) Atmospheric corrosion resistance – acceptable Mechanical resistance – poor Fin material – aluminum, copper |
| Extruded fin tubes | 
|
This fin type is formed from a bi-metallic tube consisting of an aluminium outer tube and an inner tube of almost any material. The fin is formed by rolling material from the outside of the exterior tube to give an integral fin with excellent heat transfer properties and longevity. Extruded fin offers excellent corrosion protection of the base tube. Max. operating. temp. 280ºC. | Max working temperature – 285 °C (545 °F) Atmospheric corrosion resistance – excellent Mechanical resistance – excellent Fin material – aluminum |
Fin foot is pre-formed into an LL shape (overlapped LL) and applied to base tube under tension.
However, foot is pre-shaped to give overlap of one foot onto another, thereby improving base tube protection and thermal contact area Fin materials: Aluminum Base tube materials: Any metallic material.
The smooth flat fins perpendicular to the tube surface give rise to very low resistance to air /gas flow and ensure that fouling is kept to a minimum. The foot of the fin is in contact with base tube and provides a complete sheathing over the finned length.
The Overlapped "L" fin design has interlocking fins that are wound together to prevent movement and separation. The fin protects the entire tubes, so the designation works well for the applications where corrosion is a factor.This type of finned tube is often used as an alternative to the more expensive extruded type fin in corrosive environments.
Fin tubes are a type of heat exchanger that is used in many different industries. These tubes have a finned surface, which increases their surface area and allows them to transfer heat more efficiently. This makes them ideal for applications where high heat transfer rates are required, such as in power plants and refrigeration systems.
Fin tubes are made from a variety of materials, including copper, aluminum, and stainless steel. They are available in a range of sizes and shapes and can be customized to meet the specific needs of each application.
One of the key benefits of fin tubes is their ability to operate efficiently at high temperatures and pressures. This makes them suitable for use in a wide range of applications, including air conditioning, heat exchangers, and radiators.
In addition to their high thermal performance, fin tubes are also durable and long-lasting. They are resistant to corrosion and can withstand the harsh environments often found in industrial settings. This makes them a cost-effective solution for many different industries.
Ceramic lined pipe is made through self-propagating high-temperature synthesis (SHS) technique.
Cast basalt lined steel pipe is composed by lined with cast basalt pipe, outside steel pipe and cement mortar filling between the two layers.
Ceramic tile lined pipes have very uniform coating of specially formulated ceramic material that is affixed to the inner of the pipe.
The material of the rare earth alloy wear-resistant pipe is ZG40CrMnMoNiSiRe, which is also the grade of rare earth alloy steel.
Tubes Erosion Shields are used to protect boiler tubing from the highly erosive effects of high temperatures and pressures thereby greatly extending tube life.
The ASTM A213 T91 seamless tubes are primarily used for boiler, superheater, and heat-exchanger.
When you partner with Sunny Steel, you can stop worrying about meeting deadlines thanks to our responsive and timely service. You'll also say goodbye to unnecessary shopping around. Instead, you'll get white glove service from an expert who understands your needs and can get you the materials you need quickly.
