Stud Tube Manufacturer and Supplier in China
What is Studded Tube?
Studded finned tube, also known as studded finned tube or pin-shaped tube, is a type of pipe material reinforced by welding metal nails to the pipe surface. Its appearance resembles the head of a nail, hence the name “studded tube.”
Studded tube uses metal nails fixed to the pipe surface to reinforce the pipe. The increased surface area improves heat transfer efficiency (the conductivity coefficient increases by 30-50%). It is primarily used in heat transfer equipment such as heat exchangers and air conditioners, significantly increasing pressure capacity (compressive strength increases by 20-30%) and corrosion resistance.
Studded finned tubes use cylindrical pins welded to the heat exchange tube surface in a square or hexagonal arrangement. The square or hexagonal pattern enhances heat transfer.
Nail Head Pipe Specifications:
| Parameter Category | Specification Range | Technical Description |
|---|---|---|
| Base Tube Specifications | OD 20-426mm, WT 2-12mm | Seamless steel pipe, carbon steel/stainless steel, compliant with GB/T 8163 or GB 5310 |
| Stud Head Dimensions | Diameter 3-8mm, Height 5-25mm | Cylindrical/conical stud heads, longitudinal pitch 8-30mm (hexagonal/square pattern) |
| Welding Process | Resistance welding, penetration ≥1.5mm | Weld bead height ≤1mm, no-weld spatter standard, welding speed 30 studs/minute |
| Pressure Resistance | ≤16MPa (carbon steel) | Alloy steel material can withstand higher pressure, hydrostatic test required (1.5× design pressure) |
| Temperature Range | Carbon steel ≤600℃, stainless steel ≤800℃ | High-temperature scenarios prioritize 15CrMo heat-resistant alloy steel |
| Heat Transfer Ratio | 2-3× bare tube | Stud density affects efficiency, typical layout: 120-400 studs/m² base tube area |
| Sootblowing Characteristics | Vibration frequency 5-15Hz | Cantilever self-cleaning structure, ash accumulation cycle extended to 4× bare tube (ash shear stress 0.5-1.2kPa) |
| Material Combinations | Carbon steel/stainless steel/alloy steel | Stud and base tube materials must match, 316L stainless steel for corrosive environments |
| Tolerance Control | Straightness ≤2.5mm/3m | Base tube ovality ≤1%, stud height tolerance ±0.3mm |
Applications of Studded Tubes
Studded tubes are widely used in the petrochemical industry. In particular, in the convection chamber of tubular furnaces, studded tubes are often used as heat transfer elements to enhance heat transfer outside the tube.
Studded tubes can improve the heat transfer coefficient on the flue gas side. Their area is two to three times that of bare tubes. With proper design, they can achieve the same heat intensity as radiation.
Studded tube equipment utilizes resistance welding, with PLC control. The feed motor and indexing feature servo motors. The human-machine interface allows for configuration of the number of studs, indexing parameters, and compensation coefficients, ensuring product quality and precision according to process requirements.
Applicable Scenarios Due to Structural Features
In boiler economizers, studded tubes enhance heat transfer on the flue gas side, withstand high temperatures of 400-600°C, and are suitable for dusty flue gas environments.
In chemical heat exchangers, studded tubes made of corrosion-resistant materials are used for heat exchange with acidic and alkaline media, with the stud density adjusted according to the severity of the corrosiveness.
In waste heat recovery equipment, studded finned tubes improve the heat utilization rate of low-temperature flue gas. Marine propulsion systems utilize their vibration resistance to adapt to turbulent environments.
Processing techniques require a balance between precision and strength
When welding the nail heads, argon arc welding is used, with a current controlled between 80-120A to ensure penetration depth and avoid cold welds. Monolithic nail head tubes are suitable for thin-walled pipes. The stamping pressure is set according to the material thickness, with carbon steel pressure 10%-15% higher than stainless steel. The nail head spacing tolerance is controlled within ±0.5mm, and the height tolerance does not exceed 0.3mm to ensure uniform heat transfer.
Studded Tube Material
The base tube is made of : A179, A192, SA210 Gr A1/C, A106 Gr B
Stainless steel: TP304/304L, TP316/TP316L TP310/310S TP347/TP347H
Alloy Steel:A209 T1 T1a,A213 T2 T5 T9 T11 T12 T22 T91,A335 P2 P5 P9 P11 P12 P22 P91
Finned and Studded Tubes By Industy
Studded tube is primarily used in industries such as construction, chemical engineering, and petroleum.
Studded fin tube is primarily used in construction for drainage, heating, and air conditioning systems. Its pressure resistance and corrosion resistance ensure stable operation of piping systems.
Studded tube is commonly used in the chemical industry for fluid transportation. Its sealing and corrosion resistance make it an ideal material for conveying gases and liquids.
Welded studded tube is commonly used in the petroleum industry for fluid transportation. Its sealing and corrosion resistance make it an ideal material for conveying gases and liquids.
Modern production technology has enabled finned and studded tube to be used in a wider range of applications, such as improved applications for fluid conveyance piping in automated production lines.
Top Features of Studded Fin Tube
Datang offers the widest variety of sizes available for welded studded tube in the industry.Its heat exchange efficiency can reach several times or even dozens of times that of ordinary heat exchangers.
Studded tubes are welded to the outside of the base tube with cylindrical or conical studs (3-8mm diameter). The studs are spaced 8-30mm apart, and the weld protrusion is approximately 1mm high.
Studded finned tubes have a heat transfer area 2-3 times that of plain tubes and a thermal intensity 2-3 times that of plain tubes. Finned tubes have a heat transfer area 4-9 times that of plain tubes and a thermal intensity 2-4 times that of plain tubes.
Customizable Welded Studded Tube
We can customize the material, specification and length according to your requirements.Solve your problems anytime and anywhere. Customize welded studded tubes and equipment according to your needs. Provide free technical guidance. Welcome to customize with drawings, so that you can purchase without worries.
Stud 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
High Frequency Welded Spiral Fin Tube Quality Checks
Each of our stud 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.
Studded Tube Application
Stud head specifications range from φ12 to 25 mm in diameter and 25 to 38 mm in height, with a minimum spacing of 16 mm. The material selection for studded fin tubes follows the same principles as for finned tubes.
When the fuel contains a high ash content, studded tubes are preferred because they are easier to clean due to accumulated ash.
Studded Tubes enhance heat transfer through the flue gas, withstand temperatures of 400-600°C, and are suitable for dusty flue gas environments.
Studded tubes made of corrosion-resistant materials are used for heat exchange in acidic and alkaline media. The density of the studs is adjusted according to the severity of the corrosiveness.
Studded fin tubes improve the heat utilization rate of low-temperature flue gas. Marine power systems utilize their vibration resistance to adapt to turbulent environments.
Related Product
Studded Tube FAQs
A: Stud finned tube production line 8.
A: We can provide stud finned tube samples for free.
A: After you confirm welded studded tube 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: Studded 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.