Stainless Steel Coil Tube (盘管) — Model Series 824
Product Overview
The Stainless Steel Coil Tube (盘管, Coiltube) is a precision-engineered tubular heat transfer component designed for integration into industrial reactors, mixing vessels, and chemical processing equipment. Manufactured by Wenzhou Jixing Metal Materials Co., Ltd, this coiled tube product is specifically engineered to facilitate efficient non-steady-state convective heat transfer within agitated vessels, particularly under multi-blade paddle stirring conditions. The coil geometry maximizes the surface area-to-volume ratio, enabling superior thermal management in continuous and batch processing operations.
This product line draws upon rigorous academic research in non-steady-state convective heat transfer modeling and experimental validation within kettle-type reactors under four-blade paddle (四斜叶桨) agitation. The resulting design parameters ensure optimal thermal performance under dynamically varying flow regimes and mixing conditions.
Material & Properties
The coil tube is fabricated from high-grade stainless steel alloys, selected for their exceptional corrosion resistance, thermal conductivity, and mechanical integrity under aggressive chemical environments.
- Primary Materials: AISI 304 (UNS S30400), AISI 316L (UNS S31603), and duplex stainless steel grades (e.g., 2205/UNS S31803)
- Thermal Conductivity: 14–16 W/(m·K) for 304 grade; 13–15 W/(m·K) for 316L grade
- Maximum Operating Temperature: Up to 870°C (304), 870°C (316L), 300°C (duplex)
- Corrosion Resistance: Excellent resistance to pitting (氯化物点蚀), crevice corrosion (缝隙腐蚀), and stress corrosion cracking (应力腐蚀开裂)
- Surface Finish: Electropolished (电解抛光) or passivated (钝化) to Ra ≤ 0.4 μm for hygienic applications
- Mechanical Strength: Yield strength ≥ 205 MPa (304); ≥ 170 MPa (316L)
Specifications
| Parameter | Specification / Range | Unit |
|---|---|---|
| Outer Diameter (OD) | 6 – 50 | mm |
| Wall Thickness | 0.5 – 3.0 | mm |
| Coil Pitch (节距) | 10 – 80 | mm |
| Coil Diameter (盘管外径) | 100 – 2000 | mm |
| Effective Tube Length | 2 – 50 | m |
| Heat Transfer Surface Area | 0.5 – 120 | m² |
| Maximum Operating Pressure | 0.1 – 6.4 | MPa |
| Maximum Flow Velocity (Internal) | 1.0 – 4.0 | m/s |
| Heat Transfer Coefficient (h) | 500 – 2500 | W/(m²·K) |
| Connection Type | Flanged (法兰), Threaded (螺纹), Welded (焊接) | — |
| Manufacturing Standard | GB/T 14976, ASTM A269, EN 10216-5 | — |
| Applicable Agitation | Four-blade paddle (四斜叶桨), Rushton, anchor, helical | — |
Manufacturing Process
- Material Selection & Inspection: Raw stainless steel pipe stock is sourced from certified mills and undergoes spectroscopic analysis (光谱分析), chemical composition verification, and mechanical property testing to ensure compliance with specified alloy grades.
- End Preparation: Pipe ends are deburred, chamfered, and cleaned to prepare for forming and welding operations.
- Coil Forming (盘管成型): Precision CNC coil forming machines are employed to wind the straight pipe into the specified helical geometry. The forming process maintains dimensional accuracy within ±0.5 mm tolerance for coil diameter and ±0.3 mm for pitch uniformity.
- Welding & Joining: Where multi-spiral configurations or header connections are required, orbital GTAW (Gas Tungsten Arc Welding, 钨极氩弧焊) is utilized to produce seamless, full-penetration welds with minimal heat-affected zone (热影响区, HAZ).
- Heat Treatment: Solution annealing (固溶处理) at 1050–1150°C followed by rapid water quenching restores full austenitic structure and maximizes corrosion resistance. Stress-relief annealing may be applied post-forming to eliminate residual stresses (残余应力).
- Surface Treatment: Electropolishing (电解抛光) or chemical passivation (化学钝化) removes surface contaminants and forms a stable chromium oxide passive layer (Cr₂O₃), critical for both hygienic and corrosion-critical applications.
- Quality Control & Testing: Each coil tube undergoes hydrostatic pressure testing (水压试验) at 1.5× the maximum operating pressure, dimensional verification via laser scanning (激光扫描), and radiographic or eddy-current inspection (涡流检测) of welds.
Applications
The Stainless Steel Coil Tube is widely deployed across multiple industrial sectors where efficient internal heat exchange within agitated vessels is essential:
- Chemical Processing (化工): Jacketed reactor cooling/heating, polymerization reactors, and continuous stirred-tank reactors (CSTR, 连续搅拌釜式反应器) where precise temperature control governs reaction kinetics.
- Pharmaceutical Manufacturing (制药): Hygienic-grade fermentation tanks, crystallization vessels, and sterilization systems requiring sanitary surface finishes and corrosion resistance.
- Food & Beverage Industry (食品饮料): Pasteurization units, UHT (Ultra-High Temperature, 超高温) processing equipment, and mixing kettles for dairy, juice, and sauce production.
- Petrochemical & Oil Refining (石油化工): Heat exchangers within distillation columns, catalytic cracking units, and refinery mixing vessels.
- Power Generation (发电): Economizers, condensers, and heat recovery steam generators (HRSG, 余热锅炉) in combined-cycle power plants.
- Biotechnology & Bioengineering (生物工程): Bioreactors and fermenters where temperature uniformity is critical for cell viability and product yield.
- Non-Steady-State Process Control (非稳态过程控制): Particularly suited for batch processes with time-varying thermal loads, where the coil tube's high surface area enables rapid thermal response under dynamic mixing conditions such as four-blade paddle (四斜叶桨) agitation.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management framework ensuring full traceability and regulatory compliance:
- ISO 9001:2015 — Quality Management System certification for manufacturing and supply chain processes
- ISO 14001:2015 — Environmental Management System certification
- ISO 45001:2018 — Occupational Health and Safety Management System
- CE Marking (欧盟CE认证) — Conformity with European Machinery Directive (2006/42/EC) and Pressure Equipment Directive (PED, 2014/68/EU)
- ASME Certification (美国机械工程师学会认证) — Stamping for Section VIII Div. 1 pressure vessel components where applicable
- GB/T Standards Compliance (国标合规): Full adherence to Chinese national standards including GB/T 14976 (流体输送用不锈钢无缝钢管), GB/T 24511 (承压设备用不锈钢无缝钢管), and GB 150 (压力容器)
- Material Traceability: Each coil tube is accompanied by a mill test certificate (材质证明书, MTC) per EN 10204 Type 3.1, providing full chemical composition and mechanical property data
- Non-Destructive Testing (无损检测, NDT): Radiographic testing (RT, 射线检测), ultrasonic testing (UT, 超声波检测), and magnetic particle inspection (MT, 磁粉检测) performed per ASME BPVC Section V
Unique Selling Points
1. Research-Validated Thermal Performance: The coil geometry and design parameters are informed by rigorous numerical simulation (数值模拟) and experimental validation of non-steady-state convective heat transfer within agitated kettles under four-blade paddle stirring. This ensures that the coil tube delivers predictable, high-efficiency thermal performance under real operating conditions.
2. Optimized Surface Area-to-Volume Ratio: The helical coil configuration provides significantly greater heat transfer area per unit of vessel volume compared to flat-plate or jacketed alternatives, enabling compact and efficient thermal management.
3. Dynamic Mixing Compatibility: Specifically engineered for compatibility with multi-blade paddle agitators (多叶桨搅拌器), the coil tube maintains uniform heat transfer even under non-uniform flow distributions typical of stirred vessels.
4. Full Traceability & Certification: End-to-end material traceability with EN 10204 Type 3.1 certificates ensures compliance with the most demanding regulatory frameworks in pharma, food, and chemical industries.
5. Customizable Engineering: Flexible specifications for coil diameter, pitch, tube dimensions, and connection types allow tailored solutions for specific reactor geometries and process requirements.
Wenzhou Jixing Metal Materials Co., Ltd delivers stainless steel coil tubes that combine academic rigor in thermal engineering with industrial-grade manufacturing excellence, providing reliable, high-performance heat transfer solutions for the most demanding process industries.