Stainless Steel Coil Tube — Ice Storage Thermal Application Series
Product Overview
The Stainless Steel Coil Tube (盘管) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered coiled piping product designed for thermal energy storage applications, particularly in ice storage and cooling systems. The coil tube serves as the primary heat exchange medium within ice storage tanks (蓄冰槽), facilitating efficient thermal transfer between the refrigerant and the storage medium. This product line draws upon extensive research in external ice melting methodologies (外融冰实验研究), integrating advanced thermal conductivity principles to optimize performance in both ice accumulation and release phases.
The coil tube configuration maximizes the heat transfer surface area within a compact volume, enabling high-density thermal energy storage solutions. The spiral geometry ensures uniform fluid distribution and minimizes dead zones, thereby enhancing the overall thermal efficiency of the storage system.
Material & Properties
Wenzhou Jixing Metal Materials Co., Ltd. offers stainless steel coil tubes fabricated from multiple alloy grades, selected based on the specific thermal and mechanical requirements of the application:
- Austenitic Stainless Steel (奥氏体不锈钢): Grades 304 (UNS S30400) and 316 (UNS S31600) — excellent corrosion resistance, high thermal conductivity, suitable for general ice storage and HVAC applications.
- Super-Austenitic Stainless Steel (超级奥氏体不锈钢): Grades 904L and 254 SMO — exceptional resistance to chloride-induced pitting and crevice corrosion, ideal for marine or chemically aggressive environments.
- Duplex Stainless Steel (双相不锈钢): Grades 2205 and 2507 — superior tensile strength (≥ 450 MPa) and improved resistance to stress corrosion cracking (SCC), recommended for high-pressure thermal cycling applications.
Key material properties include:
- Thermal Conductivity (导热系数): 14–16 W/(m·K) for austenitic grades; enhanced options available through surface treatment.
- Cryogenic Performance (低温性能): Maintains ductility and structural integrity at temperatures as low as −196°C (liquid nitrogen service).
- Corrosion Resistance (耐腐蚀性): Cr ≥ 18%, Ni ≥ 8% (304 grade); Mo ≥ 2% (316 grade) for chloride environments.
- Surface Finish (表面光洁度): Available in 2B, BA (Bright Annealed), or electropolished finishes with Ra ≤ 0.4 μm for hygienic applications.
Specifications
| Parameter (参数) | Specification (规格) |
|---|---|
| Outer Diameter (外径) | Φ6 mm – Φ50 mm (customizable) |
| Wall Thickness (壁厚) | 0.5 mm – 3.0 mm |
| Coil Pitch (盘管间距) | 10 mm – 50 mm (adjustable per thermal design) |
| Coil Diameter (盘管直径) | Φ100 mm – Φ2000 mm |
| Coil Length (盘管长度) | Up to 500 m per continuous coil |
| Material Grade (材质牌号) | SUS 304, 316, 316L, 904L, 2205, 2507 |
| Operating Temperature (工作温度) | −196°C to +600°C |
| Operating Pressure (工作压力) | Up to 4.0 MPa (depending on dimensions) |
| Connection Type (连接方式) | Flanged, threaded, welded, or quick-connect fittings |
| Standards (执行标准) | ASTM A269, ASTM A270, GB/T 12771, EN 10217-7 |
| Surface Treatment (表面处理) | Passivated, pickled, electropolished, or coated |
Manufacturing Process
The production of stainless steel coil tubes at Wenzhou Jixing Metal Materials Co., Ltd. follows a rigorous multi-stage manufacturing process:
- Coil Uncoiling & Straightening (开卷矫直): Cold-rolled stainless steel strip is fed through a multi-roller straightening system to achieve dimensional accuracy within ±0.05 mm tolerance.
- Forming & Welding (成型焊接): High-precision roll-forming equipment shapes the strip into the desired cross-sectional profile. TIG (Tungsten Inert Gas) welding is employed for seamless construction where required, with full penetration welds.
- Coil Winding (盘绕成型): Computer-controlled winding machines create the spiral geometry with precise pitch and diameter control, ensuring uniform spacing critical for thermal performance.
- Heat Treatment (热处理): Solution annealing at 1050–1100°C followed by controlled cooling to achieve optimal microstructure and mechanical properties.
- Surface Finishing (表面处理): Acid pickling and passivation to remove scale and oxide layers, followed by electropolishing for critical applications.
- Quality Inspection (质量检测): 100% hydrostatic pressure testing, dimensional verification via CMM (Coordinate Measuring Machine), and optional eddy current (涡流) or ultrasonic (超声) flaw detection.
Applications
The stainless steel coil tube finds extensive application across multiple industries:
- Ice Storage Thermal Systems (蓄冰槽系统): Primary heat exchange medium in ice storage tanks for peak-shaving cooling, enabling energy-efficient building HVAC systems with reduced operational costs.
- External Ice Melting Systems (外融冰系统): Optimized coil configurations facilitate controlled, uniform ice melting for rapid cooling capacity deployment.
- Cryogenic Applications (低温应用): Liquid nitrogen and liquid oxygen transfer, cryogenic storage vessels, and superconducting magnet cooling systems.
- Food & Beverage Industry (食品饮料行业): Hygienic-grade coil tubes for milk pasteurization, beer brewing, and pharmaceutical cooling circuits.
- Chemical Processing (化工处理): Corrosion-resistant heat exchangers for aggressive chemical environments, including chlorinated solutions.
- Marine & Offshore (海洋工程): Seawater-cooled thermal management systems leveraging 316L and duplex stainless steel grades.
- Automotive & Aerospace (汽车与航空航天): Precision coil assemblies for thermal management systems and hydraulic circuits.
Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd. maintains comprehensive quality assurance and certification frameworks:
- ISO 9001:2015 — Quality Management System Certification
- ISO 14001:2015 — Environmental Management System Certification
- ISO 45001:2018 — Occupational Health and Safety Management System
- CE Marking — Conformity with European health, safety, and environmental protection standards
- PED 2014/68/EU — Pressure Equipment Directive compliance for pressure-rated applications
- NACE MR0175 / ISO 15156 — Compliance for sour service (H₂S-containing environments)
- EN 10204 3.1 — Third-party inspection and material certification
- ASME Stamp — Available for pressure vessel components
Unique Selling Points
- Research-Driven Design: Product configurations informed by published experimental research on thermal conductivity and external ice melting efficiency, ensuring scientifically validated performance.
- Custom Engineering: Tailored coil pitch, diameter, and material selection to match specific thermal load requirements and system integration constraints.
- Full Traceability: Each coil tube lot includes complete material certification with mill test reports (MTR), heat number traceability, and non-destructive testing (NDT) documentation.
- Enhanced Thermal Performance: Optimized surface finish and geometry design achieve up to 20% improvement in heat transfer coefficient compared to standard coil configurations.
- Long Service Life: Superior corrosion resistance and cryogenic toughness ensure reliable operation for 20+ years under demanding thermal cycling conditions.