Stainless Steel Coil Tube (Coil Tube) — FP-5 Fan Coil Unit Series
Product Overview
The Stainless Steel Coil Tube manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered continuous tube product designed primarily for integration into the FP-5 Fan Coil Unit (FCU) Air Conditioning System. This coil tube serves as the core heat exchange element within commercial and residential HVAC (Heating, Ventilation, and Air Conditioning) applications. The product is supplied in a continuous coil configuration, enabling efficient downstream forming, bending, and fabrication into compact heat exchanger assemblies without introducing stress fractures or material degradation.
As part of the company's extensive product catalog (Catalog No. 1635), this coil tube represents a specialized grade of stainless steel tubing engineered to meet the demanding thermal cycling, corrosion resistance, and structural integrity requirements of modern fan coil air conditioning systems.
Material & Properties
The coil tube is fabricated from austenitic stainless steel, selected for its superior combination of mechanical strength, corrosion resistance, and thermal conductivity. Key material characteristics include:
- Base Material: Austenitic Stainless Steel (e.g., SUS304 / SUS316 equivalent per ASTM A269 / ASTM A213)
- Corrosion Resistance: Excellent resistance to atmospheric corrosion, condensation water, and chemical exposure inherent in HVAC environments
- Thermal Conductivity: Optimized for efficient heat transfer between refrigerant coolant and ambient air
- Creep Resistance: Maintains dimensional stability under sustained thermal loading
- Formability: Suitable for cold bending, coiling, and secondary forming operations without cracking
- Hygienic Surface: Smooth interior finish (Ra ≤ 0.4 μm) minimizes biofilm accumulation and fluid flow resistance
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (盘管 Coil Tube) |
| Catalog No. | 1635 |
| Manufacturer | Wenzhou Jixing Metal Materials Co., Ltd. |
| Material Grade | SUS304 / SUS316L (Austenitic Stainless Steel) |
| Outer Diameter (OD) | 6.35 mm – 15.88 mm (1/4" – 5/8") |
| Wall Thickness | 0.5 mm – 1.2 mm |
| Coil Diameter | 300 mm – 1000 mm (configurable) |
| Tube Length per Coil | 50 m – 500 m (continuous) |
| Surface Finish | Ba & Bright Annealed (2B / No. 4) |
| Applicable Standard | ASTM A269 / GB/T 14976 / EN 10216-5 |
| Operating Temperature Range | −40°C to +250°C |
| Maximum Working Pressure | 1.6 MPa (232 psi) |
| End Treatment | Plain end / Beveled end (per customer specification) |
| Packaging | Wooden pallet with moisture-proof wrapping |
Manufacturing Process
The production of this stainless steel coil tube follows a rigorous multi-stage manufacturing process to ensure dimensional accuracy and material integrity:
- Raw Material Selection: High-purity stainless steel wire rod is sourced from certified mills, with chemical composition verified via spectroscopic analysis (OES).
- Piercing & Extrusion: The wire rod is heated and extruded through precision dies to produce seamless tube blanks.
- Pilger Rolling / Cold Drawing: The tube blank undergoes cold drawing through calibrated dies to achieve precise OD and wall thickness tolerances (±0.05 mm).
- Heat Treatment (Annealing):strong> Solution annealing at 1050°C–1150°C followed by controlled cooling to relieve residual stresses and achieve the desired austenitic microstructure.
- Pickling & Descaling: Acid pickling removes oxide scale, restoring the passive chromium oxide layer for optimal corrosion resistance.
- Coiling: The continuous tube is wound onto precision mandrels at controlled tension to form the coil configuration, ensuring uniform curvature and minimal residual stress.
- Quality Inspection: Each coil undergoes hydrostatic pressure testing, ultrasonic flaw detection (UT), dimensional verification, and visual surface inspection.
- Packaging & Dispatch: Approved coils are protected against moisture and mechanical damage during transit.
Applications
The FP-5 Fan Coil Unit compatible stainless steel coil tube finds extensive application across multiple industries:
- Commercial HVAC Systems: Primary heat exchange tube for fan coil units in office buildings, hotels, hospitals, and retail facilities
- Residential Air Conditioning: Compact heat exchanger coils for split-type and central air conditioning systems Industrial Process Cooling: Precision temperature control in manufacturing environments requiring corrosion-resistant heat transfer
- Food & Pharmaceutical Processing: Sanitary-grade heat exchange where hygienic surface conditions are mandatory
- Marine & Coastal Environments: HVAC systems in vessels and coastal installations where saltwater corrosion resistance is critical
- Chiller & Condenser Assemblies: Secondary heat exchanger components in refrigeration systems
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system with the following certifications and compliance standards:
- ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and continuous improvement
- ISO 14001 — Environmental Management System certification
- CE Marking — Compliance with European Health, Safety, and Environmental Protection standards
- RoHS Compliance — Restriction of Hazardous Substances directive adherence
- Mill Test Certificates (MTC): Provided with each batch, detailing chemical composition, mechanical properties, and heat treatment records
- Third-Party Inspection: Available upon request through recognized inspection bodies (SGS, BV, TÜV)
Unique Selling Points
Why Choose Wenzhou Jixing Coil Tube for FP-5 Fan Coil Applications?
- Seamless Construction: Eliminates weld joints, preventing potential leak points and ensuring uniform wall thickness for superior heat transfer efficiency
- Precision Coiling Technology: Advanced coiling equipment ensures consistent curvature radius, enabling seamless integration into automated fan coil unit assembly lines
- Extended Service Life: Superior corrosion resistance in condensation environments reduces maintenance intervals by 40–60% compared to carbon steel alternatives
- Customizable Specifications: Flexible OD, wall thickness, and coil diameter options accommodate diverse OEM requirements
- Traceability: Full batch traceability from raw material to finished product ensures accountability and quality assurance
- Cost-Effective Solution: Continuous coil format reduces cutting waste and downstream processing time, lowering total fabrication costs
Technical Documentation & Support
Comprehensive technical data sheets, dimensional drawings, and material certifications are available upon request. Wenzhou Jixing Metal Materials Co., Ltd. provides ongoing technical support for product selection, application engineering, and post-delivery consultation to ensure optimal integration into FP-5 Fan Coil Unit manufacturing systems.