Stainless Steel Coil Tube — Coiltube Series (Product No. 463)

1. Product Overview

The Stainless Steel Coil Tube (盘管, Coiltube) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered continuous-length tubing product formed into helical coil configurations. Designed for demanding industrial, medical, and HVAC applications, this product series delivers exceptional corrosion resistance, thermal stability, and mechanical integrity across a wide range of operating environments.

The coil tube is available in multiple grades of austenitic and duplex stainless steel, with customizable outer diameters, wall thicknesses, and coil pitch dimensions. The continuous coil form factor eliminates the need for field welding at joints, reducing potential failure points and ensuring uniform flow characteristics throughout the system.

Key Differentiator: Wenzhou Jixing's Coiltube series is engineered to meet the stringent requirements of specialized equipment such as the PM-F900D2 Fan Coil Tube Plasma Air Disinfecter, demonstrating compatibility with high-frequency electromagnetic fields, plasma-generated reactive species, and continuous thermal cycling.

2. Material & Properties

2.1 Available Material Grades

2.2 Mechanical & Physical Properties (Typical — Grade 316L)

3. Technical Specifications

Parameter Specification / Range Standard Reference
Product Name Stainless Steel Coil Tube (盘管, Coiltube) —
Product Number 463 —
Outer Diameter (OD) Φ6.0 mm – Φ50.8 mm (¼" – 2") ASME B36.19M / EN 10217-7
Wall Thickness 0.5 mm – 3.0 mm (0.020" – 0.118") ASME B36.19M
OD Tolerance ±0.10 mm (±0.004") ISO 1128 (tolerance class CT2)
Wall Thickness Tolerance ±10% of nominal EN 10217-7
Coil Pitch 15 mm – 100 mm (customizable) Customer specification
Coil Diameter Φ100 mm – Φ2,000 mm (customizable) Customer specification
Surface Finish Mirror (Ra ≤ 0.4 μm) / Electropolished / Pickled & Passivated ASTM A967 / ASTM A240
End Condition Plain, Beveled, Flanged, or Fitted (per customer drawing) ASME B31.3
Minimum Order Quantity 50 kg per grade —
Operating Pressure (Design) Up to 25 MPa (3,625 psi), grade-dependent ASME B31.3 / PED 2014/68/EU
Service Temperature Range −196 °C to +870 °C (cryogenic to high-temperature) ASME BPVC Section VIII

4. Manufacturing Process

4.1 Process Flow

  1. Raw Material Selection: Certified stainless steel strip or seamless tube stock sourced from accredited mills (e.g., Outokumpu, Sandvik, POSCO), with full mill test certificates (MTC) traceable to heat number.
  2. Slitting & Leveling: Precision slitting of strip to required coil tube blank width; tension leveling to achieve flatness tolerance ≤ 0.15% of width.
  3. Forming (Cold Roll Forming / Rotary Draw Bending): Multi-station progressive die forming converts flat strip into continuous tube geometry with controlled wall thickness uniformity (±5% across circumference).
  4. Welding (TIG / Laser Welding): Longitudinal seam welding under inert gas (Ar or He) shielding; weld penetration verified by 100% eddy current testing (ECT).
  5. Coiling: Continuous tube wound onto precision mandrels to achieve specified coil pitch and diameter; springback compensation applied during forming to ensure dimensional accuracy.
  6. Post-Weld Heat Treatment (if required): Solution annealing at 1050–1150 °C followed by rapid quenching to restore full austenitic microstructure and maximize corrosion resistance.
  7. Surface Treatment: Acid pickling (HNO₃/HF mixture) to remove weld scale; followed by passivation to establish a stable chromium oxide film (≥ 200 mV passivation potential per ASTM A967).
  8. Final Inspection & Packaging: Dimensional verification, visual inspection, pressure testing (hydrostatic at 1.5× design pressure), and protective packaging for shipment.

4.2 Quality Control Milestones

5. Applications

5.1 Primary Application Domains

5.2 Specialized Application — Plasma Air Disinfection Systems

The Coiltube series is specifically validated for integration into PM-F900D2-type Fan Coil Tube Plasma Air Disinfectors. In this application, the stainless steel coil tube serves as the structural and thermal management component within the plasma generation chamber. Key design considerations include:

6. Quality Certifications & Standards Compliance

6.1 Certifications

6.2 Applicable Standards

7. Unique Selling Points

  1. Full Traceability: Every coil tube batch is traceable from raw material heat number through final inspection, ensuring complete supply chain accountability.
  2. Custom Coil Geometry: In-house CNC coil winding capability enables pitch, diameter, and length customization to exact customer specifications without minimum-run penalties.
  3. Weld-Free Continuous Form: The seamless coil configuration eliminates longitudinal joints, providing uniform structural integrity and eliminating potential leak paths.
  4. Plasma-Application Validated: Specifically qualified for use in plasma air disinfection systems, with documented performance data under reactive species exposure.
  5. Multi-Grade Availability: Single-source procurement for grades ranging from standard 304 to super-austenitic 904L, simplifying supply chain management.
  6. Surface Finish Excellence: Electropolishing capability achieving Ra ≤ 0.4 μm, meeting pharmaceutical and medical device surface requirements.

8. Technical Support & After-Sales

Wenzhou Jixing Metal Materials Co., Ltd. provides comprehensive technical support including:

"Engineered for integrity. Formed for performance. Trusted by industries worldwide."