Stainless Steel Coil Tube (Coil Tube) – Product No. 710
Manufacturer: Wenzhou Jixing Metal Materials Co., Ltd.
Product Overview
The Stainless Steel Coil Tube (Coil Tube) is a precision-engineered continuous-length tubular product supplied in a coiled configuration, designed to maximize material utilization, reduce cutting waste, and facilitate downstream forming operations. This product is manufactured in accordance with international standards for seamless and welded stainless steel tubing, offering exceptional corrosion resistance, mechanical integrity, and dimensional accuracy. The coil form factor is particularly advantageous for high-volume processing applications where automated feeding, cold drawing, cutting, or further conversion is required.
The coil tube product line draws upon advanced knowledge of tube coiling mechanisms, including buckle-locking (合扣机构) systems originally developed for medical-grade tubing applications. This interdisciplinary engineering insight has been adapted to stainless steel coil tube production, resulting in superior coil stability, reduced spring-back during uncoiling, and enhanced handling safety during storage and transport.
Material & Properties
The coil tube is fabricated from austenitic stainless steel grades conforming to ASTM, EN, and GB standards. Primary alloy compositions include:
- Grade 304 (UNS S30400 / 06Cr19Ni10): Contains minimum 18% Chromium (Cr) and 8% Nickel (Ni), providing excellent general corrosion resistance and weldability.
- Grade 316 (UNS S31600 / 06Cr17Ni12Mo2): Enriched with 2–3% Molybdenum (Mo) for superior resistance to pitting and crevice corrosion in chloride-rich environments.
- Grade 316L (UNS S31603): Low-carbon variant (C ≤ 0.03%) optimized for welding applications and resistance to intergranular corrosion.
- Grade 321 (UNS S32100): Stabilized with Titanium (Ti) for enhanced resistance to sensitization at elevated temperatures (up to 870°C).
Mechanical Properties (Annealed Condition, Grade 304):
- Tensile Strength (UTS): ≥ 515 MPa
- Yield Strength (0.2% Proof Stress): ≥ 205 MPa
- Elongation (A₅₀): ≥ 40%
- Hardness (HBW): 165–210
- Density: 7.93 g/cm³
Surface Finish Options:
- Pickled & Passivated (PP) – Standard matte finish
- Mechanically Polished (2B) – Smooth, uniform surface
- Mirror Polish (Ra ≤ 0.4 μm) – High-luster finish for aesthetic or hygienic applications
- Electropolished (EP) – Chemically refined surface for pharmaceutical and food-grade use
Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (Coil Tube) |
| Product Code | 710 |
| Manufacturing Method | Seamless (Cold Drawn) / ERW Welded |
| Outer Diameter (OD) | Φ3.0 mm – Φ159.0 mm |
| Wall Thickness | 0.3 mm – 6.0 mm |
| OD Tolerance | ±0.05 mm (Precision Grade); ±0.1 mm (Standard Grade) |
| Wall Thickness Tolerance | ±0.02 mm (Precision Grade); ±0.05 mm (Standard Grade) |
| Coil Inner Diameter | Φ100 mm / Φ150 mm / Φ200 mm (Customizable) |
| Coil Length | 50 m – 500 m (Standard); Custom lengths available |
| Applicable Standards | ASTM A213, ASTM A269, EN 10216-5, GB/T 12771, GB/T 14976 |
| Available Grades | 304, 304L, 316, 316L, 321, 310S, 2205 (Duplex) |
| Surface Treatment | PP / 2B / Mirror Polish / Electropolished |
| End Form | Plain Cut / Beveled / Threaded / Flanged (on request) |
| Packaging | Wooden crate / Steel pallet with moisture-proof wrapping |
| Operating Temperature Range | −196°C to +870°C (Grade-dependent) |
Manufacturing Process
The production of the stainless steel coil tube follows a rigorously controlled multi-stage process:
- Raw Material Inspection: Ingot or billet material is verified for chemical composition via Spectrographic Analysis (Spectroscopy) and mechanical testing per ASTM E10 standard.
- Piercing & Extrusion: Hot-rolled seamless tube blanks are produced via rotary piercing mills (for seamless) or ERW (Electric Resistance Welding) for welded variants.
- Pickling & Descaling: The hot-rolled oxide scale is removed through controlled acid immersion (HNO₃/HF mixture) to restore the passive chromium oxide layer.
- Cold Drawing / Cold Rolling: Precision dimensioning is achieved through multi-pass cold drawing over tungsten carbide dies or cold rolling through calibrated roll gaps. This process enhances dimensional accuracy, surface quality, and mechanical properties.
- Intermediate Annealing: Stress-relief annealing at 1050°C–1150°C in a protective atmosphere (Argon or Nitrogen) restores ductility between drawing passes.
- Coiling: The continuous tube is wound onto precision-machined coil spools using a controlled tension system. The buckle-locking mechanism (adapted from medical tubing technology) ensures secure coil retention without deformation of tube ends.
- Final Heat Treatment: Solution annealing and quenching to achieve the desired metallurgical structure (fully austenitic, solution-strengthened).
- Surface Finishing: Mechanical polishing, electropolishing, or passivation treatment as specified by the application requirements.
- Quality Inspection: Each coil undergoes 100% dimensional verification (OD gauge, wall thickness ultrasonic testing), hydrostatic pressure testing (ASTM A269), and visual surface inspection.
- Packaging & Dispatch: Coils are wrapped in moisture-barrier film, secured on export-grade wooden pallets or crates, and labeled with material traceability documentation.
Applications
The Stainless Steel Coil Tube is employed across a broad spectrum of industrial, commercial, and consumer applications:
- Medical & Pharmaceutical Equipment: Endoscopes, infusion systems, surgical instrument housings, and dialysis machine tubing (Grade 316L, electropolished).
- Food & Beverage Industry: Processing piping, CIP (Clean-in-Place) systems, brewing equipment, and dairy processing lines (Grade 304/316L, sanitary finish).
- Automotive & Aerospace: Fuel lines, exhaust systems, hydraulic lines, and structural components requiring high strength-to-weight ratios.
- Chemical Processing: Reactor internals, heat exchanger tubes, and corrosion-resistant piping for aggressive chemical environments.
- Construction & Architecture: Decorative railings, structural supports, and architectural detailing.
- Consumer Appliances: Washing machine drums, refrigerator components, and kitchen appliance housings.
- Energy & Petrochemical: Heat exchanger coils, heat transfer tubing, and cryogenic piping systems.
- Water Treatment: Filtration systems, desalination equipment, and municipal water infrastructure.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management framework ensuring adherence to international standards:
- ISO 9001:2015 – Quality Management System certification for consistent product quality and process control.
- ISO 14001 – Environmental Management System for sustainable manufacturing practices.
- ISO 45001 – Occupational Health and Safety Management System.
- CE Marking (EU) – Conformity with European Union health, safety, and environmental protection standards.
- PED (Pressure Equipment Directive 2014/68/EU) – Compliance for pressure-containing applications.
- NSF/ANSI 61 – Drinking water system components certification (where applicable).
- ASME BPE – Bioprocessing Equipment guidelines for pharmaceutical-grade tubing.
- Mill Test Certificates (MTC / EN 10204 3.1) – Full material traceability documentation provided with every shipment.
Unique Selling Points
- Coil Stability Technology: Proprietary buckle-locking mechanism (adapted from medical-grade tubing engineering) ensures zero-deformation coiling, reducing handling damage and improving downstream processing yield.
- Precision Dimensional Control: Tolerance capabilities down to ±0.02 mm enable seamless integration into high-precision assembly lines without secondary machining.
- Customizable Specifications: Full flexibility in diameter, wall thickness, coil dimensions, surface finish, and end treatment to meet project-specific requirements.
- Material Traceability: Every coil is accompanied by a complete chemical analysis report, mechanical test data, and heat number traceability for full supply chain accountability.
- Multi-Grade Availability: Single-source procurement across standard austenitic, super-austenitic, and duplex stainless steel grades reduces supplier management complexity.
- Hygienic-Grade Processing: Electropolished surfaces with Ra ≤ 0.4 μm meet the most stringent sanitary requirements for pharmaceutical and food-grade applications.
Note: All product specifications are subject to engineering review and may be customized to meet specific project requirements. For detailed technical datasheets, material certifications, or sample requests, please contact Wenzhou Jixing Metal Materials Co., Ltd. directly.