Stainless Steel Coil Tube (Coil Tube) for Temperature Control Systems
Product Series: JX-CT Series | Manufacturer: Wenzhou Jixing Metal Materials Co., Ltd. | Product No.: 878
1. Product Overview
The JX-CT Series Stainless Steel Coil Tube is a precision-engineered tubular product designed specifically for integration into industrial temperature control systems. Unlike conventional straight or seamless pipes, coil tubes are manufactured in continuous helical or spiral configurations, enabling superior heat exchange efficiency, compact installation footprints, and enhanced fluid dynamics performance. These coil tubes serve as the core heat transfer elements in systems governed by advanced process control platforms such as MCGS (Monitoring and Control Generated System), where precise thermal regulation is critical.
The coil tube geometry provides a significantly larger surface-area-to-volume ratio compared to straight tube sections of equivalent material consumption, making it ideal for applications requiring rapid thermal response, efficient heat dissipation, or controlled fluid heating and cooling cycles. Wenzhou Jixing Metal Materials Co., Ltd. leverages advanced forming technologies to produce coil tubes with consistent dimensional accuracy, uniform wall thickness, and excellent mechanical integrity suitable for demanding industrial environments.
2. Material & Properties
The JX-CT Series Coil Tubes are manufactured from high-grade austenitic and duplex stainless steels, selected to meet the rigorous demands of temperature-controlled industrial processes.
- Austenitic Grades: SUS304 (UNS S30400), SUS316 (UNS S31600), SUS321 (UNS S32100), SUS316L (UNS S31603)
- Duplex Grades: SUS31803 (UNS S31803), SUS32205 (UNS S32205)
- Specialty Grades: SUS310S (UNS S31008) for high-temperature applications
2.1 Mechanical Properties (Typical Values for SUS304 Grade)
| Property | Specification | Test Standard |
|---|---|---|
| Tensile Strength (抗拉强度) | ≥ 520 MPa | ASTM A213 / GB/T 12451 |
| Yield Strength (屈服强度) | ≥ 205 MPa | ASTM A213 / GB/T 12451 |
| Elongation (延伸率) | ≥ 40% | ASTM A213 / GB/T 12451 |
| Hardness (硬度) | ≤ 217 HB / 95 HRB | ASTM A213 / GB/T 12451 |
| Service Temperature Range (使用温度范围) | -196°C to +870°C (SUS304) | ASME SB 167 |
| Thermal Conductivity (导热系数) | 14.6 W/(m·K) at 100°C | ASTM A213 |
| Corrosion Resistance (耐腐蚀性) | Excellent in oxidizing and neutral environments | ASTM A967 |
2.2 Chemical Composition (Typical for SUS304)
| Element | C | Si | Mn | P | S | Cr | Ni | N |
|---|---|---|---|---|---|---|---|---|
| Max/Min (%) | 0.08 | 0.75 | 2.00 | 0.045 | 0.030 | 18.0-20.0 | 8.0-10.5 | 0.10 |
3. Specifications
3.1 Dimensional Specifications
| Parameter (参数) | Specification | Tolerance |
|---|---|---|
| Outer Diameter (外径, OD) | 6 mm – 114.3 mm (1/4" – 4") | ± 0.1 mm |
| Wall Thickness (壁厚, WT) | 0.5 mm – 6.0 mm | ± 10% of nominal |
| Coil Inner Diameter (盘管内径, CID) | 100 mm – 1000 mm | ± 5 mm |
| Coil Pitch (螺距) | 8 mm – 50 mm | ± 0.5 mm |
| Tube Length per Coil (单盘管长度) | 5 m – 100 m (customizable) | ± 0.5% |
| Surface Finish (表面光洁度) | 2B, BA, No.4, Mirror (Ra ≤ 0.2 μm) | Per ASTM A478 |
| End Condition (端部状态) | Plain, Beveled, Threaded, Flanged | Per customer drawing |
3.2 Performance Specifications for Temperature Control Applications
| Performance Parameter (性能参数) | Value | Test Method |
|---|---|---|
| Maximum Operating Pressure (最大工作压力) | Up to 25 MPa (depending on OD and WT) | Hydrostatic Test per ASME B31.3 |
| Pressure Test Ratio (试压比) | 1.5× working pressure | ASME B31.3 / GB/T 20801 |
| Heat Transfer Efficiency (换热效率) | 15–30% higher than equivalent straight tube | CFD Simulation / Experimental |
| Thermal Response Time (热响应时间) | Reduced by 20–40% vs. straight pipe | ISO 5149 |
| Maximum Flow Velocity (最大流速) | Up to 5 m/s (liquid), 20 m/s (gas) | ASME B31.3 |
| Winding Tension (缠绕张力) | ≤ 15% of yield strength | Internal QC Standard |
4. Manufacturing Process
The production of JX-CT Series Coil Tubes follows a rigorous multi-stage manufacturing workflow designed to ensure dimensional precision, metallurgical integrity, and surface quality.
- Raw Material Selection (原材料选择): Hot-rolled stainless steel strip or seamless tube blanks are sourced from certified mills, accompanied by full mill test certificates (MTC) per EN 10204 Type 3.1. Incoming materials undergo spectroscopic analysis (PMI) to verify chemical composition compliance.
- Tube Forming / Welding (制管/焊接): For welded coil tubes, precision TIG (Tungsten Inert Gas) welding is employed with argon shielding on both inside and outside to achieve a clean, oxide-free weld seam. For seamless coil tubes, cold drawing through a spiral die set maintains a homogeneous microstructure without weld discontinuities.
- Heat Treatment (热处理): Annealing at 1050–1150°C followed by controlled cooling restores the austenitic structure, relieves residual stresses from cold forming, and ensures full corrosion resistance. Solution annealing (固溶处理) is performed per ASTM A967 for surface conditioning.
- Spiral Coiling / Winding (螺旋盘绕): Tubes are wound onto precision-machined mandrels using CNC-controlled coiling machines. Winding parameters (tension, speed, pitch) are optimized to prevent tube ovality, kinking, or localized work hardening. The coil geometry is verified using laser scanning technology to ensure conformance to specified helix parameters.
- Surface Finishing (表面处理): Pickling and passivation (酸洗钝化) remove all oxidation and contamination, forming a protective chromium oxide layer. Additional polishing (2B, BA, or mirror finish) is available per customer requirements. Surface roughness is measured using contact profilometry per ISO 4287.
- Quality Inspection (质量检验): Each coil tube undergoes comprehensive inspection including:
- Visual and dye penetrant inspection (目视及渗透检测) per ASTM E709
- Eddy current testing (涡流检测) for wall thickness uniformity per ASTM E309
- Hydrostatic pressure testing (水压试验) per ASME B31.3
- Dimensional verification (尺寸验证) using laser calipers and CMM
- Chemical composition verification (化学成分验证) via PMI
- Packaging and Storage (包装与储存): Coils are wrapped in moisture-proof film, padded with protective material, and secured on wooden pallets. Desiccant packs are included for long-term storage. Each unit is labeled with product identification, heat number, and traceability data.
5. Applications
The JX-CT Series Stainless Steel Coil Tubes are engineered for use in a wide range of industrial temperature control and heat exchange applications:
- Industrial Process Heating & Cooling (工业过程加热与冷却): Primary heat transfer elements in process temperature control loops managed by SCADA/MCGS platforms. The coil geometry maximizes heat transfer area within compact equipment envelopes.
- Chemical Processing (化工处理): Reactor jacket coils, heat exchanger internals, and product temperature regulation in pharmaceutical and petrochemical plants where corrosion resistance and purity are paramount.
- Food & Beverage Industry (食品饮料行业): Pasteurization coils, CIP (Clean-in-Place) compatible heating loops, and thermal processing equipment where sanitary-grade stainless steel (316L) is required per FDA and 3-A standards.
- Power Generation (发电): Condenser coil elements, superheater assemblies, and economizer tubes in boiler systems where thermal cycling resistance and long service life are essential.
- Oil & Gas (石油天然气): Subsea heating coils, flow line temperature maintenance, and heat tracing systems in offshore and onshore production facilities.
- Automotive & Aerospace (汽车与航空航天): Radiator coils, intercooler elements, and thermal management systems requiring lightweight, high-performance heat exchange components.
- Refrigeration & HVAC (制冷与暖通空调): Evaporator and condenser coil assemblies in industrial refrigeration systems and large-scale HVAC installations.
6. Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system ensuring that all JX-CT Series products meet or exceed international standards:
| Certification / Standard (认证/标准) | Scope | Description |
|---|---|---|
| ISO 9001:2015 | Quality Management System | Enterprise-wide QMS certification |
| ISO 3834-2 | Welding Quality Requirements | Welded tube production compliance |
| EN 10204 3.1 | Material Test Certificate | Inspection by authorized inspection body |
| CE Marking | European Conformity | Compliance with PED Directive 2014/68/EU |
| NACE MR0175 / ISO 15156 | Oil & Gas Equipment | Susceptibility to sulfide stress cracking |
| ASME / ASBP | Pressure Vessel & Piping | Stamped components for pressure systems |
| ASTM A213 / A269 | Tube Product Standards | Material and dimensional specifications |
| GB/T 12451 | Chinese National Standard | Stainless steel seamless tubes |
| GB/T 20878 | Chinese National Standard | Stainless steel classification and designation |
| ISO 14001:2015 | Environmental Management | Environmental impact control |
| ISO 45001:2018 | Occupational Health & Safety | Workplace safety management |
7. Unique Selling Points
- Superior Heat Exchange Efficiency: The helical coil geometry provides 15–30% greater heat transfer surface area compared to equivalent-length straight tubes, resulting in faster thermal response and reduced energy consumption in temperature control systems.
- Compact Installation Footprint: Coiled configuration allows significant heat exchange capacity within minimal equipment volume, ideal for space-constrained industrial installations and retrofit applications.
- MCGS-Compatible Design: Engineered for seamless integration with MCGS (Monitoring and Control Generated System)-based temperature control architectures, supporting precise PID loop control, real-time monitoring, and automated process optimization.
- Full Traceability: Every coil tube is traceable from raw material heat number through manufacturing to final inspection, with digital documentation available for customer quality records.
- Customizable Geometry: Coil inner diameter, pitch, tube length, and surface finish are customizable to meet specific system requirements, enabling optimal thermal performance for each application.
- Corrosion Resistance & Longevity: Premium austenitic and duplex stainless steel grades provide exceptional resistance to pitting, crevice corrosion, and intergranular corrosion, extending service life in aggressive chemical and marine environments.
- Sanitary-Grade Options: Available in electropolished mirror finish (Ra ≤ 0.2 μm) meeting FDA 21 CFR, 3-A Sanitary Standards, and EHEDG guidelines for food, pharmaceutical, and bioprocessing applications.
Note: All specifications are subject to confirmation based on final design requirements. Wenzhou Jixing Metal Materials Co., Ltd. provides engineering consultation, custom design support, and comprehensive after-sales technical services for all JX-CT Series Coil Tube products. For detailed dimensional drawings and material certificates, please contact the manufacturer's technical department directly.