Applications
Stainless steel coil tube are coiled or spiral-shaped tubes known for high-temperature steam resistance, impact corrosion resistance, and anti-scaling properties. Key applications include:
Industrial & Energy Sectors: Widely used in heat exchangers, condensers, and chemical processing equipment in petrochemicals, nuclear power, and boilers; also utilized in gas pipelines and insulated steam cables.
Fluid Transport Systems: Serving as clean fluid pipelines in food and beverage (e.g., beer, milk), pharmaceuticals, medical devices, and water supply systems.
Mechanical Structures: Applied in dyeing and textile machinery, automotive and marine components, kitchen equipment, and architectural decorations.
International Standards & Materials
Standards: Chinese GB/T 12770, GB/T 12771, and GB/T 13296 (for seamless heat exchanger tubes); internationally aligned with ASTM A269/A312/A213 (USA), DIN EN 10216-5 (Europe), and JIS G4305 (Japan).
Materials: Standard TP304/304L for general use; TP316L/317L for chloride/marine environments; TP321, 310S, or 253MA for high-temperature applications; Monel 400 and Duplex Steel (2205) for high-pressure or severe chemical conditions.
Size Range
Outer Diameter (OD): Ranges from fine capillary tubes to industrial sizes, typically Φ1mm – Φ25mm (customizable up to Φ26mm+).
Wall Thickness (WT): Generally between 0.4mm – 3.0mm, supporting cold-drawn wall-reduction processes.
Coil Length: Seamless continuous lengths without welding joints. Depending on the size, single coils range from 200m to 3,500m, with custom lengths reaching up to 8,000m.
Top 10 Concerns When Ordering & Responses
Q: Do you provide true seamless coils or welded tubes with a seamless-like finish?
A: We offer both. True seamless coils are cold-drawn from billets, offering superior pressure ratings and zero weld leakage risk. Welded-and-redrawn tubes undergo bright annealing to achieve a seamless visual effect at a higher cost-performance ratio, ideal for low-pressure medical or decorative applications.
Q: How do you ensure the pressure rating matches our system?
A: We recommend appropriate wall thickness based on your working pressure. Every batch undergoes strict hydrostatic or pneumatic leak testing (up to 10MPa–35MPa) before shipment to guarantee safety.
Q: What is the tolerance precision for OD and WT?
A: Using high-precision cold-drawing sizing technology, OD and WT tolerances can be strictly controlled within ±0.05mm, and even as tight as ±0.01mm.
Q: What is the surface finish and temper upon delivery? Is it easy to bend?
A: Delivered in an annealed soft temper (HRB≤90) for effortless bending. Surfaces can be customized with vacuum Bright Annealing (BA) or pickling/passivation to ensure a clean, oxide-free interior and exterior.
Q: Our medium contains strong acids, alkalis, or chlorides. Is corrosion resistance guaranteed?
A: Yes. We will recommend 316L or specialized alloys accordingly and can provide third-party authoritative test reports for intergranular or electrochemical corrosion upon request.
Q: Do you offer cut-to-length services?
A: Yes. We provide electric or manual coil uncoiling machines that feature automatic straightening and chipless cutting, ensuring high precision and minimal material waste.
Q: What are the NDT inspection standards before shipment?
A: All products undergo 100% eddy current testing to eliminate hidden cracks. Ultrasonic testing can also be added upon special request, accompanied by detailed inspection reports.
Q: How do you prevent scratches and deformation during long-distance shipping?
A: Domestic orders use woven bags, while export shipments are packed in shock-proof plywood boxes or wooden reels to effectively prevent physical damage during ocean or land transit.
Q: What is the lead time for standard sizes? Do custom orders require production scheduling?
A: Standard imperial and metric sizes are well-stocked and can be shipped within 3 days. Custom or extra-long specifications require negotiated lead times based on order volume.
Q: Can you provide a complete quality traceability system?
A: Absolutely. Shipments include Mill Test Certificates (MTC), spectrometer material analysis reports, and full batch traceability records, backed by a "fake one, compensate ten" guarantee for worry-free procurement.
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