Stainless Steel Coil Tube — Wenzhou Jixing Metal Materials Co., Ltd.
Product Overview
The Stainless Steel Coil Tube (Product No. 1362) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered coiled tubular component designed for demanding industrial and commercial applications. This product is engineered to deliver superior thermal conductivity, mechanical integrity, and long-term corrosion resistance, making it an ideal choice for HVAC heat exchange systems — including horizontal concealed fan coil units (e.g., FP-5 series) — as well as fluid transport, chemical processing, and food-grade piping systems.
The coil tube is supplied in a continuous helical coil configuration, enabling efficient downstream forming, cutting, and installation without the need for additional welding at joints, thereby minimizing leakage points and maximizing system reliability.
Material & Properties
The coil tube is fabricated from high-quality austenitic stainless steel, conforming to internationally recognized material standards. The following key properties characterize the material:
- Base Alloy: Austenitic stainless steel (grades including 304 / 316L, per ASTM A213 / EN 10216-5)
- Corrosion Resistance: Excellent resistance to atmospheric corrosion, acidic media, and chlorinated environments; the addition of molybdenum in 316L grade provides enhanced pitting and crevice corrosion resistance
- Thermal Conductivity: Optimized for efficient heat transfer in exchanger applications
- Mechanical Strength: High tensile strength and elongation, ensuring dimensional stability under cyclic thermal loading
- Hygienic Surface: Mirror-polished interior surface (Ra ≤ 0.4 μm) to prevent bacterial adhesion and facilitate cleaning
- Temperature Range: Operational from cryogenic temperatures up to +600 °C without loss of structural integrity
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Category | Stainless Steel Coil Tube (Coiltube) |
| Material Grade | SUS304 / SUS316L / Custom Alloys |
| Outer Diameter (OD) | 6.0 mm – 50.8 mm (customizable) |
| Wall Thickness | 0.5 mm – 3.0 mm |
| Coil Diameter | 150 mm – 800 mm |
| Coil Length | Up to 30 m per coil (continuous) |
| Surface Finish | BA (Bright Annealed) / Pickled & Passivated / Mirror Polish |
| Tolerance | ±0.1 mm (OD); ±0.05 mm (wall thickness) |
| End Form | Plain / Beveled / Threaded / Flanged (as specified) |
| Standard References | ASTM A269 / A213, EN 10216-5, GB/T 12771 |
| Maximum Operating Pressure | Up to 4.0 MPa (depending on geometry) |
| Welding Compatibility | TIG / MIG / Orbital welding — no cracking or sensitization |
Manufacturing Process
The production of the stainless steel coil tube follows a rigorous multi-stage manufacturing protocol to ensure consistent quality and dimensional accuracy:
- Raw Material Selection: Cold-rolled stainless steel strip from certified mills, with full chemical composition verification via spectroscopic analysis (OES).
- Forming: High-precision roll-forming machines shape the strip into a seamless tubular cross-section with controlled ovality (< 1% of OD).
- Welding: Continuous longitudinal welding using high-purity argon-shielded TIG process, ensuring weld strength equivalent to the base metal.
- Heat Treatment: Solution annealing at 1050–1100 °C followed by rapid quenching to restore full austenitic microstructure and eliminate residual stresses.
- Coiling: The continuous tube is wound onto a helical coil form using CNC-controlled winding heads to maintain uniform coil pitch and prevent deformation.
- Surface Treatment: Pickling and passivation (acid immersion) to remove scale and form a protective chromium oxide layer; optional electropolishing for hygienic-grade applications.
- Quality Inspection: Non-destructive testing (NDT) including eddy current testing, hydrostatic pressure testing, and visual inspection of weld seams.
Applications
The versatility of this stainless steel coil tube makes it suitable for a wide range of industrial and commercial sectors:
- HVAC Systems: Heat exchanger coils for horizontal concealed fan coil units (e.g., FP-5 series), air handlers, and chillers — providing efficient air-to-water heat exchange.
- Food & Beverage Industry: Sanitary fluid transfer lines, CIP (Clean-in-Place) compatible piping, and dairy/pharmaceutical processing equipment.
- Chemical Processing: Corrosion-resistant transfer of aggressive media including acids, alkalis, and solvents.
- Medical Equipment: Sterilizable tubing for autoclavable systems and medical gas delivery.
- Automotive & Aerospace: Fluid lines for braking systems, fuel delivery, and hydraulic circuits requiring high fatigue resistance.
- Water Treatment: Membrane housing feed lines and ultrafiltration systems.
Unique Selling Points
- Seamless Coil Configuration: Delivered as a continuous helical coil, eliminating the need for field welding and reducing installation time by up to 40%.
- Hygienic-Grade Interior: Electro-polished surface with Ra ≤ 0.4 μm meets 3-A / EHEDG sanitary standards.
- Superior Corrosion Performance: 316L grade provides exceptional resistance to chlorides, making it suitable for coastal and chemical environments.
- Precision Dimensional Control: CNC manufacturing ensures tight tolerances (±0.1 mm), enabling drop-in replacement in OEM equipment.
- Customization Capability: Wenzhou Jixing offers tailored OD, wall thickness, coil diameter, and end-form configurations to meet specific project requirements.
- Traceability: Each batch is accompanied by a full material certificate (MTC) with heat number, chemical analysis, and mechanical test results.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system ensuring adherence to international standards:
- ISO 9001:2015 — Quality Management System certification
- ISO 14001 — Environmental Management System
- CE Marking — Compliance with European Conformity directives (PED 2014/68/EU)
- EN 10204 3.1 — Material Test Certificate Type 3.1 (independent inspection)
- NSF/ANSI 61 — Drinking Water System Components (where applicable)
- ASME BPV Code — Boiler and Pressure Vessel Code compliance for pressure-rated applications
Quality Assurance Statement: Every coil tube batch undergoes 100% hydrostatic pressure testing at 1.5× the maximum operating pressure, with zero-defect acceptance criteria. Incoming material is verified through third-party laboratory analysis, and final product inspection is conducted by independent quality auditors.
Conclusion
The Wenzhou Jixing Stainless Steel Coil Tube (Product No. 1362) represents a high-performance, multi-application tubular solution combining metallurgical excellence with precision manufacturing. Its seamless coil design, hygienic-grade surface finish, and compliance with global quality standards position it as a preferred component for OEM manufacturers and integrators in the HVAC, food processing, chemical, and medical industries. For technical inquiries, custom specifications, or sample requests, contact Wenzhou Jixing Metal Materials Co., Ltd. directly.