Stainless Steel Flat-Plate Coil Tube for Heat Exchanger Applications
Product Overview
The Flat-Plate Coil Tube (hereinafter referred to as "FPC Tube") manufactured by Wenzhou Jixing Metal Materials Co., Ltd. represents a specialized class of stainless steel tubing engineered for enhanced thermal performance in compact heat exchanger assemblies. Unlike conventional round-section coil tubes, the FPC Tube features a flattened cross-sectional geometry that significantly increases the effective heat transfer surface area per unit length, thereby improving overall heat exchange efficiency. This product is designed for use in plate-and-coil heat exchanger configurations where space constraints and thermal performance requirements demand optimized surface-to-volume ratios.
The FPC Tube undergoes precision forming to achieve a consistent flattened profile with controlled wall thickness uniformity, ensuring reliable mechanical integrity and predictable thermal behavior under operating conditions. The product is available in multiple stainless steel grades to accommodate diverse chemical environments and service temperature ranges.
Material & Properties
The FPC Tube is fabricated from austenitic stainless steel grades, with the following materials available:
- 304 (UNS S30408): General-purpose grade offering excellent corrosion resistance, formability, and weldability. Chromium content of 18–20% with nickel content of 8–10.5%.
- 316L (UNS S31603): Low-carbon variant with added molybdenum (2–3%) providing superior resistance to pitting and crevice corrosion in chloride-containing environments.
- 321 (UNS S32100): Titanium-stabilized grade suitable for elevated temperature service up to 870°C, resistant to intergranular corrosion.
- 310S (UNS S31008): High-temperature grade with enhanced oxidation resistance, suitable for aggressive thermal environments exceeding 1100°C.
Key mechanical and physical properties of the primary grade (304) include:
- Tensile Strength (抗拉强度): ≥ 520 MPa (ASTM A269)
- Yield Strength (屈服强度): ≥ 205 MPa
- Elongation (延伸率): ≥ 40% (minimum)
- Thermal Conductivity (热导率): 14.6–16.3 W/(m·K) at 25°C
- Corrosion Resistance (耐蚀性): Excellent resistance to atmospheric, aqueous, and mild chemical environments
Specifications
| Parameter (参数) | Specification / Range | Standard Reference |
|---|---|---|
| Tube Type (管型) | Flat-Plate Coil (扁圆盘管) | Enterprise Standard (企业标准) |
| Flat Width (扁宽) | 10 mm – 50 mm | Custom / Negotiable |
| Wall Thickness (壁厚) | 0.3 mm – 1.5 mm | ASTM A269 / ASME B16.12 |
| Coil Diameter (盘管直径) | 50 mm – 300 mm | Custom / Negotiable |
| Coil Length (盘管长度) | 0.5 m – 10 m (standard); longer upon request | Enterprise Standard |
| Surface Finish (表面光洁度) | 2B Annealed, No.4 Brushed, or Mirror (Ra ≤ 0.4 μm) | ASTM A478 |
| Tolerance – Width (宽度公差) | ±0.1 mm | Enterprise Standard |
| Tolerance – Wall Thickness (壁厚公差) | ±0.02 mm | ASTM A269 |
| Material Grades (材质牌号) | 304, 316L, 321, 310S, 904L, 2205 Duplex | ASTM A269 / EN 10217 |
| Operating Temperature (使用温度) | −196°C to +870°C (grade-dependent) | Manufacturer's Data Sheet |
| Maximum Working Pressure (最大工作压力) | Up to 2.5 MPa (configuration-dependent) | ASME BPV Section VIII |
| End Treatment (端部处理) | Plain, Flanged, Threaded, or Soldered | Custom / Negotiable |
Manufacturing Process
The production of the FPC Tube follows a multi-stage precision manufacturing sequence:
- Raw Material Selection (原材料选择): Cold-rolled stainless steel strip of certified grade is procured, with each batch subjected to spectroscopic analysis to verify chemical composition compliance.
- Strip Forming (带材成型): The flat strip is precision-formed into a round tube via high-speed roll-forming equipment, achieving tight dimensional tolerances on the initial tube geometry.
- Welding (焊接): Continuous longitudinal welding is performed using Automated Submerged Arc Welding (SAW) or Laser Welding technology to ensure seam integrity with minimal heat-affected zone (HAZ).
- Flattening (压扁成型): The round tube is passed through calibrated roller sets that progressively flatten the cross-section to the target width while maintaining controlled wall thickness and ovality limits.
- Coiling (盘绕): The flattened tube is coiled at controlled tension and curvature to achieve the specified coil diameter without inducing residual stress or geometric distortion.
- Heat Treatment (热处理): Solution annealing is conducted in a protective atmosphere (argon or vacuum) at temperatures between 1010°C and 1150°C, followed by controlled cooling to restore full austenitic structure and mechanical properties.
- Surface Finishing (表面处理): Pickling, passivation, and optional mechanical polishing are applied to achieve the required surface finish and corrosion resistance.
- Quality Inspection (质量检测): Each coil undergoes hydrostatic pressure testing, dimensional measurement, visual inspection of weld seams, and optional destructive sampling per lot.
Applications
The Flat-Plate Coil Tube is employed across a broad spectrum of industrial heat transfer applications where enhanced surface area and compact design are critical:
- Chemical Processing (化工行业): Reactor cooling, distillation column condensers, and process fluid heat exchangers in petrochemical and pharmaceutical plants.
- Food & Beverage Industry (食品饮料): Pasteurization systems, UHT (Ultra-High Temperature) milk processing, and CIP (Clean-In-Place) compatible heat exchangers.
- Pharmaceutical Manufacturing (制药): Sterile heat exchangers, condensate recovery, and jacketed reactor cooling systems requiring sanitary-grade tubing.
- Power Generation (电力): Condenser tubes, feedwater preheating, and waste heat recovery systems.
- HVAC & Refrigeration (暖通空调): Compact air-cooled heat exchangers and refrigerant condensers requiring high efficiency in limited footprint.
- Marine & Offshore (海洋工程): Seawater-cooled heat exchangers where corrosion resistance and thermal efficiency are paramount.
- Automotive (汽车工业): Aftermarket heat exchangers, oil coolers, and intercooler components.
Unique Selling Points
- Enhanced Heat Transfer Coefficient (强化传热系数): The flattened geometry increases the heat transfer surface area by up to 120% compared to equivalent round tubes of the same mass, significantly improving thermal performance.
- Compact Design (紧凑设计): Reduced coil diameter and optimized profile enable smaller heat exchanger footprints while maintaining or exceeding thermal capacity.
- Superior Pressure Drop Characteristics (优越的压降特性): The flattened cross-section promotes turbulent flow at lower Reynolds numbers, enhancing convective heat transfer without excessive pumping power requirements.
- Wide Material Compatibility (广泛的材质适配): Available in multiple austenitic and duplex stainless steel grades to address aggressive chemical environments and extreme temperature ranges.
- Consistent Quality (品质一致性): Automated manufacturing with in-process monitoring ensures dimensional accuracy and mechanical property uniformity across production lots.
Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd. maintains rigorous quality management systems and holds the following certifications:
- ISO 9001:2015 – Quality Management System (质量管理体系)
- ISO 14001:2015 – Environmental Management System (环境管理体系)
- ISO 45001:2018 – Occupational Health and Safety Management System (职业健康安全管理体系)
- CE Marking – Compliance with European Machinery Directive 2006/42/EC (欧盟机械指令)
- PED 2014/68/EU – Pressure Equipment Directive compliance for pressure-containing applications (压力设备指令)
- NSF/ANSI 61 – Drinking Water System Components (饮用水系统组件认证)
- 3-A Sanitary Standards – Applicable for food-grade and pharmaceutical applications (3-A卫生标准)
- EN 10204 3.1 – Full Third-Party Inspection Certificates available upon request (第三方全检证书)
All products are accompanied by a Material Test Report (MTR) per EN 10204 Type 3.1, certifying chemical composition, mechanical properties, dimensional compliance, and heat treatment records for traceability and regulatory compliance.
Conclusion
The Flat-Plate Coil Tube from Wenzhou Jixing Metal Materials Co., Ltd. represents an advanced solution for high-efficiency thermal management in compact heat exchanger systems. By combining precision manufacturing capabilities, extensive material selection, and internationally recognized quality certifications, this product delivers superior thermal performance, mechanical reliability, and long-term service life across demanding industrial applications.