Stainless Steel Coil Tube — Product Technical Specification
Manufacturer: Wenzhou Jixing Metal Materials Co., Ltd. | Product Code: JX-CT-693
1. Product Overview
The Stainless Steel Coil Tube (hereinafter referred to as "Coil Tube") is a continuously wound tubular product manufactured from austenitic or duplex stainless steel wire. Unlike conventional straight-length stainless steel tubing, the Coil Tube is produced in a helical or spiral configuration, allowing for efficient storage, transportation, and on-site deployment in flexible-length applications. This product is particularly suited for industries requiring hygienic, corrosion-resistant, and mechanically robust tubular components in variable-length installations.
Wenzhou Jixing Metal Materials Co., Ltd. leverages advanced cold-drawing and coiling technologies to produce Coil Tubes with consistent dimensional accuracy and surface integrity. The product line encompasses a wide range of outer diameters, wall thicknesses, and coil configurations tailored to specific industrial requirements.
2. Material & Properties
2.1 Material Grades
- Austenitic Grades: AISI 304 (UNS S30400), AISI 304L (UNS S30403), AISI 316 (UNS S31600), AISI 316L (UNS S31603), AISI 321 (UNS S32100), AISI 316Ti (UNS S31609)
- Duplex Grades: UNS S31803 (2205), UNS S32750 (2507 Super Duplex)
- Other: Custom alloy compositions available upon request
2.2 Mechanical Properties (Typical — Annealed Condition)
| Property | AISI 304 | AISI 316 | UNS S31803 (2205) |
|---|---|---|---|
| Tensile Strength (Rm) — MPa | 515 – 730 | 515 – 730 | 550 – 800 |
| Yield Strength (Rp0.2) — MPa | ≥ 205 | ≥ 205 | ≥ 450 |
| Elongation (A5) — % | ≥ 40 | ≥ 40 | ≥ 15 |
| Hardness (HBW) | ≤ 210 | ≤ 210 | ≤ 310 |
2.3 Chemical Composition (wt%)
| Element | 304 | 316 | 2205 |
|---|---|---|---|
| C | ≤ 0.08 | ≤ 0.08 | ≤ 0.03 |
| Cr | 18.0 – 20.0 | 16.0 – 18.0 | 22.0 – 23.0 |
| Ni | 8.0 – 10.5 | 10.0 – 14.0 | 4.5 – 5.5 |
| Mn | ≤ 2.0 | ≤ 2.0 | ≤ 1.0 |
| Si | ≤ 1.0 | ≤ 1.0 | ≤ 0.30 |
| P | ≤ 0.045 | ≤ 0.045 | ≤ 0.030 |
| S | ≤ 0.030 | ≤ 0.030 | ≤ 0.030 |
| Mo | — | 2.0 – 3.0 | 3.0 – 3.5 |
| N | — | — | 0.14 – 0.20 |
2.4 Corrosion Resistance
- Pitting Resistance: Characterized by PREN (Pitting Resistance Equivalent Number) values of 19–20 for 316L and 24–25 for 2205 duplex
- Intergranular Corrosion: Low-carbon grades (304L, 316L) resist sensitization during welding and high-temperature exposure
- Crevice Corrosion: Duplex grades offer superior resistance in chloride-containing environments
3. Specifications
| Parameter | Specification Range |
|---|---|
| Outer Diameter (OD) | Φ3.0 mm – Φ50.8 mm (1/8" – 2") |
| Wall Thickness | 0.20 mm – 3.00 mm |
| Coil Inner Diameter | Φ200 mm – Φ600 mm (standard); custom sizes available |
| Coil Length per Roll | Up to 300 meters (continuous) |
| Surface Finish | BA (Bright Annealed), No.4 Brushed, 2B Cold Rolled, Mirror (8K), Custom |
| Tolerance on OD | ±0.05 mm (precision); ±0.10 mm (standard) |
| Tolerance on Wall Thickness | ±10% of nominal |
| Standard Length (if straightened) | 3 m, 6 m, or custom cut-to-length |
| Heat Treatment Condition | Annealed (solution treated at 1050–1150°C, water quenched) |
| Packaging | Wooden pallet with moisture-proof film; custom packaging available |
4. Manufacturing Process
4.1 Process Flow
- Raw Material Preparation: Selection of certified stainless steel seamless or welded wire rod with verified chemical composition and mechanical properties
- Cold Drawing: Wire rod is cold-drawn through precision dies to achieve the target outer diameter and wall thickness with tight dimensional tolerances
- Intermediate Annealing: Periodic solution annealing (1050–1150°C) during multi-pass drawing to relieve accumulated cold work and restore ductility
- Final Annealing & Surface Treatment: Bright annealing in a controlled reducing atmosphere (endothermic gas) to achieve a clean, oxide-free surface suitable for hygienic applications
- Precision Coiling: The tube is wound onto a precision coiler with controlled tension to produce uniform coil geometry without deformation or kinking
- Quality Inspection: 100% inspection for dimensional accuracy, surface quality, and material certification; sampling for hydrostatic testing and spectrographic analysis
- Packaging & Dispatch: Protective wrapping, moisture barriers, and secure palletization for global shipment
4.2 Novel Coil Tube Installation Technology
Building upon the principles observed in heavy-duty excavator front-fork mechanisms, Wenzhou Jixing Metal Materials has developed a Novel Coil Tube Installer (CTI) — a mechanical deployment device that enables rapid, controlled, and low-stress uncoiling and positioning of Coil Tubes at installation sites. The CTI system utilizes a dual-arm gripping and guided-feed mechanism analogous to the load-bearing kinematics of excavator bucket forks, allowing the installer to:
- Maintain consistent tension during uncoiling, preventing ovalization or kinking
- Deploy Coil Tubes vertically or horizontally with minimal manual intervention
- Reduce installation time by up to 60% compared to conventional manual methods
- Minimize operator fatigue and improve workplace safety in confined or elevated work environments
This installation technology represents a significant advancement in field-deployable stainless steel tubing solutions, bridging the gap between factory-precision manufacturing and on-site installation efficiency.
5. Applications
- Food & Beverage Industry: Hygienic fluid transfer lines, dairy processing equipment, brewery piping systems, CIP (Clean-in-Place) circuits
- Pharmaceutical & Biotechnology: Process piping for GMP-compliant facilities, bioreactor connections, sterile transfer lines
- Chemical & Petrochemical Industry: Corrosive fluid transport, heat exchanger tubes, reactor internals
- Oil & Gas: Subsea umbilical components, offshore platform piping, chemical injection systems
- Medical Devices: Endoscope tubing, surgical instrument housings, dialysis equipment
- Automotive: Fuel lines, brake lines, exhaust system components, hydrogen fuel cell manifolds
- Construction & Architecture: Decorative railings, structural reinforcement, HVAC condensation drainage
- Electronics: Heat sinks, precision gas delivery lines, vacuum system components
6. Quality Certifications & Compliance
| Certification / Standard | Scope |
|---|---|
| ISO 9001:2015 | Quality Management System |
| ISO 14001:2015 | Environmental Management System |
| ISO/IEC 17025 | Testing Laboratory Competence |
| EN 10204 3.1 | Material Test Certificates (Mill Certificate) |
| ASME BPE | Biological & Process Equipment (hygienic applications) |
| 3-A Sanitary Standards | Dairy & Food Industry Hygiene |
| NORSOK M-650 | Oil & Gas Industry Material Requirements |
| ASTM A269 / A270 | Stainless Steel Tubing Product Standards |
| EN 10217-7 | European Stainless Steel Tubing Standard |
7. Unique Selling Points
- Continuous Coiled Format: Eliminates butt-weld joints in long runs, reducing leak points and improving system integrity
- Customizable Specifications: Full flexibility in OD, wall thickness, surface finish, and coil geometry to match exact project requirements
- Advanced Installation Technology: Proprietary Coil Tube Installer (CTI) system inspired by excavator front-fork mechanics, enabling rapid and stress-free field deployment
- Full Traceability: Each coil is traceable to its heat number with complete material test certificates and production documentation
- Hygienic-Grade Surface Quality: Bright Annealed (BA) finish with Ra ≤ 0.25 μm available for pharmaceutical and food-grade applications
- Global Supply Chain: Export-ready packaging and compliance with international standards for worldwide distribution
Wenzhou Jixing Metal Materials Co., Ltd. — Engineering Excellence in Stainless Steel Tubular Solutions.