Stainless Steel Spiral Coil Tube — Wenzhou Jixing Metal Materials Co., Ltd.

Product Overview

The Stainless Steel Spiral Coil Tube (盘管, Coil Tube) is a precision-engineered tubular product manufactured by Wenzhou Jixing Metal Materials Co., Ltd. This product is produced through a specialized rolling and bending process that transforms flat stainless steel strip material into continuous helical coil configurations. The manufacturing methodology, as documented in the technical study titled "Spiral Coil Tube Manufacturing Process and Tooling Using a Rolling Machine" (用卷板机弯制螺旋盘管工艺及工装), represents a sophisticated integration of mechanical forming technology, fixture design, and material science principles.

Unlike conventional straight tubing, the spiral coil tube offers a uniquely optimized geometry that maximizes surface-area-to-volume ratios, making it indispensable in thermal management, fluid transfer, and pressure containment applications. The product is available in both single-coil and multi-coil configurations, with helical pitch, tube diameter, and coil diameter tailored to specific engineering requirements.

Material & Properties

Wenzhou Jixing Metal Materials Co., Ltd. sources raw materials from certified suppliers to ensure compliance with international material standards. The following material grades are available for coil tube production:

304 / 304L Stainless Steel (UNS S30400 / S30403): General-purpose austenitic stainless steel with excellent corrosion resistance, formability, and weldability. The "L" designation indicates a low-carbon variant suitable for welding applications.
316 / 316L Stainless Steel (UNS S31600 / S31603): Molybdenum-enhanced austenitic stainless steel offering superior resistance to pitting and crevice corrosion in chloride-rich environments.
321 Stainless Steel (UNS S32100): Titanium-stabilized austenitic stainless steel designed for high-temperature service, resisting intergranular corrosion.
310S Stainless Steel (UNS S31008): High-temperature austenitic stainless steel with excellent oxidation resistance up to 1150°C.
Duplex Stainless Steel 2205 (UNS S31803): Duplex austenitic-ferritic stainless steel combining high strength with exceptional resistance to stress corrosion cracking.

Key mechanical and physical properties of the primary material grade (304 Stainless Steel):

Tensile Strength (抗拉强度): ≥ 515 MPa (75 ksi)
Yield Strength (屈服强度): ≥ 205 MPa (29.7 ksi)
Elongation (延伸率): ≥ 40%
Density (密度): 8.0 g/cm³
Thermal Conductivity (导热系数): 16.3 W/(m·K) at 100°C
Maximum Service Temperature (最高使用温度): 870°C (oxidation atmosphere), 32°C (reducing atmosphere)
Corrosion Resistance (耐腐蚀性): Excellent resistance to atmospheric, aqueous, and many chemical environments

Specifications

Parameter	Specification / Range	Unit
Tube Outer Diameter (OD) (管外径)	Φ6.0 – Φ38.0	mm
Tube Wall Thickness (壁厚)	0.5 – 2.0	mm
Tube Inner Diameter (ID) (管内径)	Φ5.0 – Φ36.0	mm
Coil Diameter (盘管直径)	Φ100 – Φ2000	mm
Helical Pitch (螺旋节距)	5.0 – 50.0 (customizable)	mm
Number of Turns (圈数)	10 – 5000 (customizable)	turns
Coil Length / Development Length (展开长度)	5 – 500	m
Surface Finish (表面光洁度)	2B, BA, No.4, Mirror (Ra ≤ 0.4 μm)	—
End Treatment (端部处理)	Plain end, Beveled end, Threaded end, Flanged end	—
Dimensional Tolerance (尺寸公差)	±0.1 mm (OD), ±0.05 mm (wall thickness)	mm
Roundness Tolerance (圆度公差)	≤ 0.05 mm	mm
Standard Reference (执行标准)	ASTM A213, ASTM A269, GB/T 12771, GB/T 13296, EN 10217	—
Packaging (包装方式)	Wooden crate, palletized with protective wrapping, vacuum sealed	—

Manufacturing Process

The production of spiral coil tubes at Wenzhou Jixing Metal Materials Co., Ltd. follows a rigorously controlled multi-stage process, as outlined in the technical study on spiral coil tube manufacturing using rolling machines (用卷板机弯制螺旋盘管工艺及工装). Each stage is designed to maintain dimensional accuracy, surface integrity, and mechanical performance throughout the forming operation.

Raw Material Inspection & Pre-Treatment (原材料检验与预处理)

Stainless steel strip coils are received from certified suppliers and subjected to incoming quality inspection, including visual examination, dimensional verification, and material certification review (Mill Test Certificate / MTC). Strips are cleaned and degreased to remove surface contaminants, oils, and mill scale prior to forming.
Strip Feeding & Leveling (带材送料与矫平)

The stainless steel strip is fed through a leveling mechanism that eliminates residual stresses and flatness defects inherent in the coiled strip. Precise leveling ensures uniform material flow during the subsequent forming stages, preventing wrinkles, buckling, or dimensional inconsistencies.
Tube Forming by Rolling (卷制成型)

The flat strip is passed through a series of precision-ground rollers (卷板机) that progressively bend the strip into a tubular cross-section. The rolling machine (卷板机) employs a controlled reduction sequence, where each successive roller pair imposes an incremental bend angle. The roller configuration and spacing are carefully designed to produce a uniform wall thickness and circular cross-section throughout the tube length.
Seam Welding (接缝焊接)

Once the strip is formed into a near-circular tube shape, the longitudinal seam is sealed using either resistance seam welding (电阻缝焊) or high-frequency induction welding (高频感应焊). The welding parameters—current, voltage, roller pressure, and travel speed—are precisely controlled to achieve full penetration welds with minimal heat-affected zone (HAZ). Post-weld seam inspection is performed using visual examination (VT) and, where required, dye penetrant testing (PT) or ultrasonic testing (UT).
Helical Coiling / Bending (螺旋弯制)

The formed and welded tube is then directed through a helical bending fixture (螺旋弯制工装) that imparts the desired spiral geometry. The bending fixture, comprising guide rollers, cam mechanisms, and positioning stops, controls the coil diameter, helical pitch, and number of turns. The tooling design (工装设计) is critical to maintaining consistent bend radii and preventing ovalization, kinking, or wall thinning at bend locations. The rolling machine (卷板机) is synchronized with the bending mechanism to ensure continuous, stable production.
Post-Forming Heat Treatment (成形后热处理)

Depending on the material grade and application requirements, the coil tube may undergo solution annealing (固溶退火) at temperatures between 1010°C and 1150°C, followed by rapid air cooling. This process relieves residual stresses introduced during forming, restores the full austenitic microstructure, and maximizes corrosion resistance and ductility.
Surface Finishing (表面处理)

The coil tube surface is finished to the specified grade through mechanical polishing (机械抛光), electropolishing (电解抛光), or passivation (钝化处理). Electropolishing removes up to 25–50 μm of surface material, producing a smooth, corrosion-resistant surface with Ra values as low as 0.4 μm. Passivation involves immersion in a nitric acid or citric acid solution to remove free iron contaminants and enhance the passive chromium oxide layer.
Quality Inspection & Testing (质量检验与测试)

Each batch of coil tubes undergoes comprehensive quality assurance testing, including dimensional measurement (caliper, micrometer, bore gauge), surface inspection, pressure testing (水压试验/气压试验), and material verification (spectroscopic analysis / 光谱分析). Non-destructive testing (NDT) methods such as eddy current testing (涡流检测) and magnetic particle inspection (磁粉检测) may be applied as required.
Coiling, Packaging & Storage (盘卷、包装与储存)

Finished coil tubes are wound onto protective cores and packaged in wooden crates or palletized with moisture-proof wrapping. Each package is labeled with product identification, material grade, heat number, and inspection certificate reference.

Applications

The stainless steel spiral coil tube is widely deployed across multiple industrial sectors where compact geometry, high thermal efficiency, and corrosion resistance are paramount:

Heat Exchangers & Thermal Management (热交换器与热管理): Coil tubes serve as efficient heat transfer elements in shell-and-coil heat exchangers, air-to-water heat exchangers, evaporators, and condensers. The helical geometry promotes turbulent flow, significantly enhancing heat transfer coefficients compared to straight tube configurations.
Refrigeration & HVAC Systems (制冷与暖通空调系统): Spiral coil tubes are integral components in refrigeration evaporators and condensers, chiller units, and air conditioning systems, where compact heat exchange surfaces are required within constrained installation spaces.
Petrochemical & Oil Refining (石油化工与炼油): Used in heat recovery systems, distillation columns, and process cooling circuits where resistance to aggressive chemical media and high-temperature service is essential.
Food & Beverage Processing (食品加工): Employed in pasteurization systems, CIP (Clean-in-Place) circuits, and brewing equipment where hygienic surface finish and corrosion resistance comply with FDA and 3-A sanitary standards.
Pharmaceutical Manufacturing (制药): Utilized in sterile processing equipment, autoclaves, and bioreactor cooling systems requiring GMP-compliant, low-particulate-release surfaces.
Power Generation (发电): Applied in waste heat recovery systems, steam generators, and cooling circuits in both conventional and renewable energy installations.
Automotive Industry (汽车工业): Used in automotive radiators, intercooler tubes, and exhaust heat recovery systems where lightweight, compact, and durable heat exchange components are required.
Marine & Shipbuilding (海洋与造船): Deployed in marine cooling systems, boiler feedwater preheaters, and desalination plants where resistance to seawater corrosion is critical.
Chemical Processing (化工): Utilized in reactor cooling coils, distillation system internals, and chemical dosing lines requiring resistance to acids, alkalis, and organic solvents.

Quality Certifications

Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management framework aligned with international standards:

ISO 9001:2015 — Quality Management Systems (质量管理体系)
ISO 14001:2015 — Environmental Management Systems (环境管理体系)
ISO 45001:2018 — Occupational Health and Safety Management Systems (职业健康安全管理体系)
CE Certification — Conformity with European Union directives for product safety (欧盟CE认证)
EN 10204 3.1 — Mill Test Certificate (MTC) issued by authorized quality assurance personnel (质量证明书)
ASME Stamp Certification (where applicable) — For pressure-containing components (压力容器认证)
Material Compliance — ASTM, EN, GB, and JIS standards (ASTM A213, ASTM A269, EN 10217, GB/T 12771, JIS G3446)

Every production batch is accompanied by a detailed inspection report documenting dimensional measurements, material composition analysis (via optical emission spectroscopy / OES), mechanical test results, and non-destructive testing outcomes. Full traceability from raw material heat number to finished product is maintained throughout the manufacturing chain.

Unique Selling Points

Proprietary Rolling Machine Technology — Wenzhou Jixing Metal Materials Co., Ltd. leverages specialized rolling machine (卷板机) technology and custom-designed tooling (工装) to achieve superior dimensional consistency and surface quality in spiral coil tube production, as demonstrated in their technical study on the manufacturing process.

Precision Customization (精密定制): Full customization of coil diameter, helical pitch, tube dimensions, and surface finish to meet exact application specifications, with rapid prototyping capability for new designs.
Integrated Process Control (集成过程控制): The seamless integration of tube forming, seam welding, and helical bending in a single production line ensures uniform quality throughout the coil length, minimizing defects at transition zones.
Wide Material Range (材料范围广): Availability of multiple stainless steel grades including 304, 316L, 321, 310S, and duplex 2205, enabling solutions for diverse environmental and performance requirements.
Superior Surface Quality (卓越表面质量): Electropolished and passivated surfaces with Ra values as low as 0.4 μm, meeting the stringent hygiene and corrosion resistance demands of food, pharmaceutical, and chemical industries.
Full Traceability (全程可追溯): Complete batch traceability from raw material certification through manufacturing to final inspection, ensuring accountability and regulatory compliance.
Technical Expertise (技术实力): Deep engineering knowledge in spiral coil tube manufacturing processes and tooling design, supported by documented technical studies and continuous process improvement.
Competitive Lead Times (有竞争力的交货期): Efficient production scheduling and well-established supply chain management enable competitive delivery timelines for both standard and custom orders.

Technical Notes

The manufacturing process for spiral coil tubes using rolling machines (卷