Stainless Steel Coil Tube (盘管) — Wenzhou Jixing Metal Materials Co., Ltd.
Product Overview
The Stainless Steel Coil Tube (盘管, Coiltube), product reference number 869, is a continuously wound tubular product manufactured by Wenzhou Jixing Metal Materials Co., Ltd. This product is supplied in coil form, offering significant advantages in downstream processing efficiency, material utilization, and handling logistics compared to straight-length tubing. The coil tube is designed for a wide range of industrial applications, with particular relevance to modular piping and wiring harness systems used in commercial vehicle chassis assemblies, including bus chassis route management systems.
Coil tubes are produced through seamless or welded forming processes and delivered in a helically wound configuration, enabling continuous feeding into automated forming, bending, and assembly lines. This format is especially advantageous for applications requiring modular installation of piping networks, where high-volume, repeatable production of complex tube geometries is essential.
Material & Properties
The coil tube is fabricated from high-grade austenitic stainless steel, conforming to recognized international material standards. The following table summarizes typical material compositions and mechanical properties:
| Property | Specification |
|---|---|
| Material Grade | 304 (UNS S30400), 316L (UNS S31603), or equivalent |
| Standard Reference | ASTM A213 / A269, EN 10217-7, GB/T 12771 |
| Carbon (C) | ≤ 0.08% (304) / ≤ 0.02% (316L) |
| Chromium (Cr) | 18.0–20.0% |
| Nickel (Ni) | 8.0–10.5% (304) / 10.0–14.0% (316L) |
| Molybdenum (Mo) | 2.0–3.0% (316L only) |
| Tensile Strength (Rm) | ≥ 520 MPa |
| Yield Strength (Rp0.2) | ≥ 205 MPa |
| Elongation (A) | ≥ 40% |
| Surface Finish | BA (Bright Annealed), 2B, or No. 4 Brushed |
| Corrosion Resistance | Excellent in atmospheric, chemical, and marine environments |
Specifications
| Parameter | Range / Value |
|---|---|
| Outer Diameter (OD) | 6.0 mm – 159.0 mm |
| Wall Thickness | 0.5 mm – 6.0 mm |
| Coil Inner Diameter (CID) | 500 mm – 2,000 mm (customizable) |
| Coil Weight | Up to 5,000 kg per coil |
| Tolerance on OD | ±0.1 mm (precision grade) |
| Tolerance on Wall Thickness | ±10% of nominal |
| Length per Coil | Continuous (typically 50 m – 500 m) |
| End Condition | Plain cut, threaded, or flanged (upon request) |
| Packaging | Wooden pallet with moisture-proof wrapping and steel banding |
Manufacturing Process
The production of stainless steel coil tube at Wenzhou Jixing Metal Materials Co., Ltd. follows a rigorous multi-stage process designed to ensure dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Selection: High-purity stainless steel strip or wire rod is procured from certified mills, with full chemical analysis and mechanical property verification prior to processing.
- Forming: The strip is fed through a roll-forming line where precision tooling progressively bends and shapes the material into a tubular configuration. For seamless coil tubes, a pilot-tube or Mannesmann process is employed.
- Welding (where applicable):strong> In the case of welded coil tubes, a Transverse Argon Arc (TIG) or Plasma welding process is used to create a high-integrity joint, followed by weld bead grinding to achieve a smooth internal surface.
- Heat Treatment: The formed tube undergoes solution annealing at temperatures between 1050°C and 1150°C, followed by controlled cooling to achieve a fully austenitic microstructure and optimal corrosion resistance.
- Pickling and Passivation: The tube is immersed in a mixed acid bath (nitric/hydrofluoric acid) to remove scale and oxide layers, followed by passivation to establish a protective chromium oxide film.
- Coiling: The finished tube is wound onto a precision-controlled coiling station, maintaining uniform tension to prevent ovality, kinking, or surface damage during winding.
- Quality Inspection: Each coil undergoes dimensional verification (OD, wall thickness, flatness), visual inspection, and non-destructive testing (eddy current or ultrasonic) to detect internal or surface defects.
Applications
The coil tube product is suited for a broad spectrum of industrial and commercial applications, including but not limited to:
- Commercial Vehicle Chassis Systems: Modular piping and wiring harness routing in bus and heavy-duty vehicle chassis assemblies. The coil format enables continuous feeding into automated bending and assembly stations, supporting high-volume modular installation designs with improved production efficiency and reduced assembly time.
- Fluid Conveyance Systems: Hydraulic lines, pneumatic circuits, fuel lines, and lubricant passages in automotive and industrial equipment.
- Food and Pharmaceutical Processing: Hygienic-grade piping for dairy, beverage, and pharmaceutical production lines where corrosion resistance and cleanability are critical.
- Chemical and Petrochemical Industry: Process piping, heat exchanger tubes, and reactor internals requiring resistance to aggressive chemical media.
- Architecture and Construction: Structural tubing, decorative railings, and building envelope systems.
- Medical Equipment: Surgical instrument tubing, infusion lines, and diagnostic equipment housings.
- Heat Exchangers and Condensers: Continuous coil tubing for air-cooled and shell-and-tube heat exchanger assemblies.
Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system aligned with international standards:
- ISO 9001:2015 — Quality Management Systems
- ISO 14001:2015 — Environmental Management Systems
- ISO/TS 22163 — Automotive Quality Management (IATF 16949 aligned)
- CE Marking — European Conformity for applicable product categories
- EN 10204 3.1 — Mill Test Certificates (MTC) provided with each shipment
- Material Certification: ASTM, EN, and GB standards compliance with third-party inspection available upon request
Note: All coil tube products are supplied with a full traceability package including heat number, chemical analysis report, mechanical test results, and dimensional inspection data. Custom specifications, including special surface treatments, end configurations, and coil dimensions, are available through direct consultation with the manufacturer's engineering team.
Unique Selling Points
- Continuous Coil Format: Eliminates butt-weld joints in downstream applications, improving system integrity and reducing leak risk in critical piping networks.
- High Dimensional Consistency: Precision manufacturing ensures uniform OD and wall thickness along the entire coil length, enabling reliable automated processing.
- Superior Corrosion Resistance: Austenitic stainless steel grades provide long service life in aggressive environments, minimizing maintenance and replacement costs.
- Modular Assembly Compatibility: Ideal for modular piping and wiring harness installation systems, supporting efficient, repeatable production workflows in commercial vehicle manufacturing.
- Customization Flexibility: Wide range of sizes, grades, surface finishes, and coil configurations available to meet specific project requirements.
- Full Traceability: Complete material documentation and traceability from raw steel to finished coil, ensuring compliance with automotive and industrial quality requirements.