SYP Series Stainless Steel Coil Tube (盘管) — Technical Product Specification
Manufacturer: Wenzhou Jixing Metal Materials Co., Ltd.
Product Code: 629
Product Category: Coil Tube (盘管 / Coiltube)
1. Product Overview
The SYP Series Stainless Steel Coil Tube is a precision-engineered coiled piping product designed for high-efficiency heat exchange and fluid conveyance applications. Manufactured by Wenzhou Jixing Metal Materials Co., Ltd., this coil tube integrates advanced laser welding technology with premium stainless steel materials to deliver superior mechanical integrity, corrosion resistance, and thermal performance. The product is particularly optimized for integration with SYP series centrifugal fan systems, where galvanized steel plate impellers are joined via laser welding to ensure seamless structural continuity and minimal pressure drop.
The coil tube geometry provides maximum heat transfer surface area within a compact footprint, making it an ideal solution for HVAC (Heating, Ventilation, and Air Conditioning) systems, industrial heat exchangers, refrigeration coils, and fluid distribution networks requiring high durability and long service life.
2. Material & Properties
2.1 Base Material
- Primary Alloy: Stainless Steel (AISI 304 / AISI 316 / AISI 321, as specified per application)
- Surface Treatment: Galvanized coating available for enhanced atmospheric corrosion resistance
- Impeller Material: Galvanized Steel Plate (SYP Series Fan Impeller)
- Welding Process: Laser Welding (Continuous-wave fiber laser, wavelength 1064 nm)
2.2 Mechanical Properties
| Property | Specification |
|---|---|
| Tensile Strength (抗拉强度) | ≥ 520 MPa (AISI 304); ≥ 550 MPa (AISI 316) |
| Yield Strength (屈服强度) | ≥ 205 MPa (AISI 304); ≥ 240 MPa (AISI 316) |
| Elongation (延伸率) | ≥ 40% (AISI 304); ≥ 35% (AISI 316) |
| Hardness (硬度) | ≤ 217 HB (Annealed condition) |
| Operating Temperature Range | -196 °C to +870 °C (AISI 304); -196 °C to +870 °C (AISI 316) |
| Corrosion Resistance | Excellent resistance to acids, alkalis, chlorides, and atmospheric environments |
| Thermal Conductivity | 16.3 W/(m·K) at 100 °C (AISI 304) |
3. Specifications
| Parameter | Specification |
|---|---|
| Product Series | SYP Series Coil Tube (SYP系列盘管) |
| Outer Diameter (OD) | 6 mm – 50 mm (customizable) |
| Wall Thickness | 0.3 mm – 3.0 mm |
| Coil Pitch (螺距) | 10 mm – 50 mm (adjustable per design requirement) |
| Coil Length | Up to 5000 mm per coil assembly |
| Winding Accuracy | ±0.1 mm (pitch deviation) |
| Welding Method | Laser Welding (激光焊接) — fiber laser, continuous mode |
| Welding Speed | 10 – 100 mm/s (process-dependent) |
| Laser Power | 1000 W – 6000 W (fiber laser source) |
| Surface Finish | Ra ≤ 0.8 μm (welded seam); Ra ≤ 0.4 μm (body surface) |
| Impeller Type | Galvanized Steel Plate Centrifugal Impeller (镀锌钢板离心叶轮) |
| Applicable Standards | ASTM A269, ASTM A270, GB/T 12771, EN 10217-7 |
4. Manufacturing Process
4.1 Process Flow
- Material Preparation: Selection and inspection of certified stainless steel strip or seamless tube per ASTM/GB specifications. Incoming material undergoes spectroscopic analysis to verify chemical composition.
- Blanking & Slitting: Precision slitting of stainless steel strip to required width and thickness tolerances using high-speed slitting lines.
- Forming: Cold-forming of the flat strip into the required tube profile using multi-roll forming mills with synchronized feeding mechanisms.
- Coil Winding: Continuous helical winding of the formed tube using CNC-controlled winding machines to achieve precise pitch and concentricity.
- Laser Welding (激光焊接): The longitudinal seam of the formed tube and the coil-to-coil joints are welded using a continuous-wave fiber laser (λ = 1064 nm). The laser welding process ensures:
- Minimal Heat-Affected Zone (HAZ) — typically < 0.5 mm
- High welding precision with seam width of 0.3–0.8 mm
- Excellent mechanical properties at the weld joint (≥ 90% of base material tensile strength)
- Smooth, defect-free weld bead with no spatter or oxidation
- Integration with SYP series galvanized steel plate impeller welding for complete fan-coil assemblies
- Post-Weld Heat Treatment: Solution annealing at 1050–1100 °C followed by rapid quenching to restore corrosion resistance and mechanical properties in the HAZ.
- Surface Finishing: Electropolishing or mechanical polishing of the coil tube interior to achieve the required surface roughness for fluid dynamics optimization.
- Quality Inspection: Multi-stage inspection including visual examination, ultrasonic testing (UT), eddy current testing (ECT), and dimensional verification using CMM (Coordinate Measuring Machine).
- Packaging & Dispatch: Protective wrapping, moisture-proof packaging, and shipment per customer requirements.
4.2 Laser Welding Process Details
The laser welding process employed in the SYP series coil tube production leverages advanced fiber laser technology to achieve superior weld quality compared to conventional resistance or TIG welding methods. The concentrated energy density of the laser beam (up to 10⁶ W/cm²) enables deep penetration welding with minimal thermal distortion, which is critical for maintaining the dimensional accuracy of the coil geometry. The process parameters — laser power, welding speed, focal length, and shielding gas composition (typically Ar or He) — are precisely controlled via CNC systems to ensure consistent weld quality across the entire production run.
5. Applications
- HVAC Systems: Air handling units, rooftop units, and central air conditioning systems requiring high-efficiency heat exchange coils.
- Refrigeration: Evaporator and condenser coils for commercial refrigeration and cold storage facilities.
- Industrial Heat Exchangers: Shell-and-coil heat exchangers for chemical processing, petroleum refining, and power generation.
- SYP Series Fan Systems: Integrated coil-fan assemblies for ventilation, dust collection, and pneumatic conveying systems.
- Automotive: Intercooler coils, evaporator coils, and exhaust heat recovery systems.
- Food & Beverage Processing: Sanitary-grade heat exchange coils for pasteurization, sterilization, and temperature control.
- Pharmaceutical: Clean-room HVAC coils and process heating/cooling systems requiring high purity and corrosion resistance.
6. Quality Certifications & Standards Compliance
| Certification / Standard | Description |
|---|---|
| ISO 9001:2015 | Quality Management System certification ensuring consistent product quality and process control |
| ISO 14001:2015 | Environmental Management System certification for sustainable manufacturing practices |
| ISO 45001:2018 | Occupational Health and Safety Management System |
| CE Marking | Conformity with European health, safety, and environmental protection standards |
| EN 10217-7 | European standard for welded stainless steel tubes for mechanical and structural applications |
| ASTM A269 / A270 | American standards for austenitic stainless steel welded and seamless tubes |
| GB/T 12771 | Chinese national standard for welded stainless steel tubes for general application |
| TÜV Certification | Third-party certification for product safety and quality compliance |
7. Unique Selling Points
- Advanced Laser Welding Integration: The SYP series employs state-of-the-art fiber laser welding technology, delivering weld joints with mechanical properties exceeding 90% of the base material strength — significantly superior to conventional welding methods.
- Precision Coil Geometry: CNC-controlled winding ensures pitch accuracy of ±0.1 mm, enabling optimal fluid dynamics and heat transfer performance.
- Integrated Fan-Coil Assembly: Seamless integration of galvanized steel plate impellers with coil tubes through laser welding creates unified assemblies with minimal pressure drop and maximum aerodynamic efficiency.
- Superior Corrosion Resistance: Available in AISI 316 grade with molybdenum addition for exceptional resistance to chloride-induced pitting and crevice corrosion.
- Customizable Design: Full range of OD, wall thickness, and pitch configurations to meet specific engineering requirements.
- Comprehensive Quality Assurance: Multi-stage inspection protocols including UT, ECT, and dimensional verification ensure zero-defect delivery.
8. Technical Support & Documentation
Wenzhou Jixing Metal Materials Co., Ltd. provides comprehensive technical documentation including material test certificates (MTC), weld procedure qualifications (WPQ), dimensional inspection reports, and process validation data. Engineering support is available for custom coil tube design, thermal performance modeling, and system integration consultation.