Stainless Steel Coil Tube (Coiltube) — Wenzhou Jixing Metal Materials Co., Ltd.
1. Product Overview
The Stainless Steel Coil Tube (Product No. 1092), manufactured by Wenzhou Jixing Metal Materials Co., Ltd., is a precision-engineered continuous coil wound tubing designed for high-performance heat exchange, fluid transport, and mechanical systems. This product is specifically engineered to meet the rigorous demands of Fan Coil Unit (FCU) applications, HVAC (Heating, Ventilation, and Air Conditioning) systems, and automated process control environments where reliability, thermal efficiency, and corrosion resistance are paramount.
The coil tube is supplied in continuous coil form, enabling seamless integration into automated manufacturing lines equipped with Programmable Logic Controller (PLC) systems for precision cutting, forming, and quality monitoring. The product represents a fusion of metallurgical excellence and modern industrial automation, making it suitable for both static installations and dynamic measurement-and-control systems.
2. Material & Properties
2.1 Base Material
- Primary Grades: SUS304 (AISI 304), SUS316 (AISI 316), SUS316L (AISI 316L), and SUS321 (AISI 321)
- Equivalent Standards: EN 1.4301 (304), EN 1.4401 (316), EN 1.4404 (316L)
- Composition: Austenitic stainless steel with controlled Chromium (Cr) and Nickel (Ni) content to ensure superior passivation and corrosion resistance
2.2 Key Mechanical Properties
- Tensile Strength (UTS): ≥ 520 MPa (SUS304); ≥ 570 MPa (SUS316)
- Yield Strength: ≥ 205 MPa
- Elongation at Break: ≥ 40%
- Hardness: ≤ 92 HRB (Annealed Condition)
- Density: 7.93 g/cm³
- Thermal Conductivity: 16.3 W/(m·K) at 20°C
- Operating Temperature Range: −196°C to +870°C
2.3 Surface Finish & Corrosion Resistance
- Surface Treatment: Polished (2B, BA, No.4, or Mirror finish available upon request)
- Corrosion Resistance: Excellent resistance to atmospheric corrosion, mild acids, alkalis, and chlorinated environments
- Hygienic Grade: Available in Ra ≤ 0.4 μm finish for food-grade and pharmaceutical applications
3. Specifications
| Parameter | Specification |
|---|---|
| Product Type | Stainless Steel Coil Tube (Coiltube) |
| Product Number | 1092 |
| Outer Diameter (OD) | 6.0 mm – 50.0 mm (custom sizes available) |
| Wall Thickness | 0.3 mm – 3.0 mm |
| Coil Inner Diameter | 150 mm / 300 mm / 500 mm (standard options) |
| Coil Length | Continuous coil; 50 m – 1,000 m per coil (configurable) |
| Material Grades | SUS304, SUS316, SUS316L, SUS321 |
| Surface Finish | 2B, BA, No.4 Polished, Mirror (Ra ≤ 0.2 μm) |
| Tolerance (OD) | ±0.05 mm (precision grade); ±0.1 mm (standard) |
| Tolerance (Wall Thickness) | ±0.03 mm (precision grade); ±0.05 mm (standard) |
| Manufacturing Standard | ASTM A213 / A269, GB/T 12771, EN 10217, JIS G3459 |
| Packaging | Wooden pallet with waterproof wrapping; export-grade crating available |
| Customization | Custom OD, wall thickness, coil diameter, and surface finish upon request |
4. Manufacturing Process
The production of Wenzhou Jixing's stainless steel coil tube follows a rigorous, multi-stage manufacturing workflow designed to ensure dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Selection: Virgin stainless steel strip or seamless tube blanks sourced from certified mills, subjected to incoming chemical composition analysis via Spectroscopy (OES/XRF).
- Coil Winding: Continuous tube is precisely wound onto coils using automated winding machines with tension control to prevent deformation or kinking.
- Precision Dimensional Control: Tolerances on OD and wall thickness are maintained through automated laser measurement systems integrated with PLC-controlled feedback loops.
- Surface Finishing: Electropolishing or mechanical polishing is applied to achieve the specified surface roughness (Ra) values, critical for hygiene and thermal performance.
- Quality Inspection: Each coil undergoes 100% visual inspection, dimensional verification, and sampling for Positive Material Identification (PMI) testing.
- Protective Packaging: Coils are wrapped in moisture-proof film and secured on export-grade wooden pallets to prevent surface damage during transit.
5. Applications
5.1 HVAC & Fan Coil Unit (FCU) Systems
The coil tube is a critical component in Fan Coil Unit (FCU) heat exchangers, where it serves as the serpentine tubing through which refrigerant or hot water circulates. In modern FCU systems, the coil tube is integrated with PLC-based measurement and control systems that monitor:
- Supply and return water temperatures
- Air-side coil surface temperature
- Valve actuator positions for flow regulation
- Compressor and fan speed coordination
The use of stainless steel coil tube in these systems eliminates the risk of internal corrosion and scaling that plagues carbon steel alternatives, thereby extending equipment service life and maintaining consistent thermal transfer coefficients over time.
5.2 Additional Applications
- Automotive Heat Exchangers: Radiator and intercooler tubing
- Food & Beverage Processing: Hygienic fluid transfer lines, pasteurization systems
- Pharmaceutical Equipment: Clean-in-place (CIP) compatible tubing
- Petroleum & Chemical Industry: Corrosive fluid handling and distillation columns
- Marine Engineering: Seawater cooling loops and desalination systems
- Medical Devices: Precision instrument tubing and endoscope channels
- Automation & Instrumentation: Pressure sensing lines, pneumatic control circuits
6. Quality Certifications & Compliance
| Certification / Standard | Description |
|---|---|
| ISO 9001:2015 | Quality Management System certification ensuring consistent product quality and process control |
| ISO 14001 | Environmental Management System certification |
| ASTM A213 | Standard Specification for Seamless Ferritic and Austenitic Stainless Steel Tubing for High-Temperature Service |
| ASTM A269 | Standard Specification for Seamless and Welded Austenitic Stainless Steel Tubing for Chemical and Similar Severe Service |
| GB/T 12771 | Chinese National Standard for Welded Stainless Steel Tubes for General Application |
| EN 10217 | European Standard for Technical Delivery Conditions for Stainless Steel Tubes |
| JIS G3459 | Japanese Industrial Standard for Austenitic Stainless Steel Tubes for General Use |
| CE Marking | Conformity with European health, safety, and environmental protection standards |
| MTR (Mill Test Report) | Provided with each shipment; includes chemical composition, mechanical properties, and dimensional data |
7. Unique Selling Points
"Precision-Made Stainless Steel Coil Tubes, Engineered for Intelligent Systems"
- PLC-Compatible Precision: Tolerances are held to ±0.03 mm (wall thickness) and ±0.05 mm (OD), enabling seamless integration with PLC-controlled automated cutting, bending, and assembly systems.
- Superior Corrosion Resistance: SUS316 and SUS316L grades provide exceptional resistance to chlorides and acidic environments, eliminating the need for additional passivation treatments in aggressive applications.
- Thermal Performance: Consistent wall thickness and smooth internal surface finish minimize flow turbulence and maximize heat transfer efficiency in FCU heat exchangers.
- Full Traceability: Every coil is batch-traceable with a corresponding Mill Test Report (MTR) and Positive Material Identification (PMI) verification.
- Customization Capability: Wenzhou Jixing offers fully customizable coil dimensions, surface finishes, and packaging configurations to meet project-specific requirements.
- Cost-Effective Continuous Supply: Coil form eliminates butt-weld joints, reducing material waste by up to 30% compared to straight-length tubing and lowering downstream fabrication costs.
8. Conclusion
The Wenzhou Jixing Stainless Steel Coil Tube (Product No. 1092) represents a high-performance solution for industries demanding precision, durability, and corrosion resistance. Whether deployed in PLC-controlled Fan Coil Unit systems, food-grade processing lines, or marine engineering applications, this product delivers consistent quality backed by international certifications and a commitment to metallurgical excellence. As a trusted supplier of precision stainless steel tubing solutions, Wenzhou Jixing Metal Materials Co., Ltd. continues to advance the boundaries of coil tube manufacturing through process innovation and rigorous quality management.