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Help CenterStainless Steel Spiral Punched Tube, 0.8mm Wall, 25mm OD, 304L Grade, 12mm Pitch, for High-pressure Heat Exchangers
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Anping County Boli Hardware Wiremesh Products Factory, a trusted manufacturer since 1998, proudly presents our Stainless steel spiral punched tube — a precision-engineered component designed specifically for high-pressure heat exchanger applications. With a wall thickness of 0.8mm, outer diameter of 25mm, and a 12mm pitch, this 304L grade tube delivers exceptional strength, corrosion resistance, and thermal performance. Our decades of manufacturing experience and annual export value of US$5-10 million ensure that every tube meets rigorous quality standards, making it a reliable choice for industries across North America, Europe, and beyond.
The spiral punched design enhances turbulent flow, significantly improving heat transfer efficiency while minimizing pressure drop. Whether you are constructing shell-and-tube heat exchangers, condensers, or evaporators, this tube offers a durable solution that withstands harsh operating conditions. Below, we detail the key specifications, benefits, and why Boli is your ideal partner for this critical component.
Key Features & Specifications
- Material: 304L stainless steel — low carbon content resists intergranular corrosion during welding and high-temperature exposure.
- Wall Thickness: 0.8mm (±0.05mm tolerance) — balances strength with weight reduction for cost-effective designs.
- Outer Diameter: 25mm — standard size compatible with common tube sheets and fittings.
- Pitch: 12mm — optimized for enhanced heat transfer without excessive flow resistance.
- Spiral Punched Pattern: Creates internal turbulence, increasing heat transfer coefficient by up to 30% compared to smooth tubes.
- Surface Finish: Available in annealed, pickled, or bright finish per customer request.
- Custom Lengths: We can cut to any length from 1 meter to 12 meters, with precision end preparation.
Technical Parameters
| Parameter | Value |
| Material Grade | 304L (UNS S30403) |
| Outer Diameter (OD) | 25 mm ±0.1 mm |
| Wall Thickness (WT) | 0.8 mm ±0.05 mm |
| Pitch (Spiral) | 12 mm |
| Maximum Working Pressure | Up to 25 MPa (dependent on end connections) |
| Operating Temperature Range | -196°C to 800°C (304L) |
| Surface Roughness | Ra ≤ 0.8 μm (standard); finer available on request |
Advantages for High-Pressure Heat Exchangers
The unique spiral punched geometry offers several engineering benefits:
- Enhanced Heat Transfer: The spiral pattern disrupts the boundary layer, promoting turbulent flow that increases the heat transfer coefficient. This allows for more compact heat exchanger designs, saving space and material costs.
- Reduced Fouling: The continuous turbulence helps prevent deposits from accumulating on the tube wall, extending maintenance intervals and improving operational efficiency.
- High Pressure Capability: With a 0.8mm wall and 304L grade, the tube can withstand high internal pressures (up to 25 MPa) while maintaining structural integrity under thermal cycling.
- Corrosion Resistance: 304L stainless steel offers excellent resistance to a wide range of chemicals, including acids, alkalis, and chlorides, making it suitable for harsh environments.
- Weldability: The low carbon content of 304L minimizes the risk of sensitization during welding, ensuring strong, durable joints.
Why Choose Anping Boli?
Since 1998, Anping County Boli Hardware Wiremesh Products Factory has been a reliable manufacturer of metal products, serving clients in over 15 countries. Our annual export value of US$5-10 million reflects the trust placed in us by industries such as petrochemical, power generation, and marine engineering. We ship from major ports including Tianjin, Qingdao, Shanghai, and Foshan, ensuring timely delivery worldwide.
Every spiral punched tube undergoes strict quality control—dimensional inspection, pressure testing, and surface finish verification. We can also customize the pitch, length, and end treatment (plain, beveled, or threaded) to match your specific requirements. Our skilled team provides technical support to help you select the optimal tube configuration for your heat exchanger design.
We are committed to delivering products that meet international standards for performance and safety. While we do not claim specific certifications unless explicitly requested, our manufacturing processes are aligned with common industry practices, and we can provide material test reports (MTR) upon request.
Contact us today for a quotation or sample. Let Boli be your partner in building efficient, durable high-pressure heat exchangers.
Frequently Asked Questions
Q1: Can this tube be used for gases as well as liquids?
Yes, the spiral punched tube is effective for both single-phase and two-phase heat transfer, including gases, liquids, and condensing/evaporating fluids. The turbulent flow pattern improves heat transfer regardless of the medium.
Q2: What is the maximum continuous operating temperature for 304L?
304L stainless steel can be used in continuous service up to 800°C, but for high-pressure applications, we recommend consulting our engineering team to ensure the design meets safety margins.
Q3: Do you offer samples before bulk order?
Absolutely. We can provide sample lengths of up to 1 meter for testing. Sample cost is negotiable, and we offer free samples for established clients with valid inquiries.
Q4: How is the spiral pattern formed? Does it affect the tube's mechanical strength?
The spiral pattern is formed by a cold-rolling process that displaces material without removing it. This work-hardens the tube slightly, actually increasing its yield strength in the patterned area while maintaining ductility.
Q5: What tolerances do you maintain on outer diameter and wall thickness?
We maintain OD tolerance of ±0.1 mm and wall thickness tolerance of ±0.05 mm on standard products. Tighter tolerances are available for specialized applications at additional cost.
Q6: Can you provide the tube in different lengths or with custom end preparations?
Yes, we can cut to exact lengths from 0.5 m to 12 m, and we offer end preparations including plain cut, deburred, beveled for welding, or threaded ends per your specification.
Q7: Is this tube suitable for food-grade or pharmaceutical applications?
304L is generally considered food-grade and can be used in hygienic applications. However, for pharmaceutical or ultra-clean requirements, we recommend an electropolished surface finish, which we can supply upon request.
Q8: What is the typical lead time for bulk orders?
For standard sizes (25mm OD, 0.8mm WT, 12mm pitch), lead time is typically 15–25 working days, depending on quantity. Custom specifications may require 30–40 working days. We maintain a stock of raw materials to expedite production.
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