Stainless Steel Coil Tube (Coiltube) — Product No. 1191
Product Overview
The Stainless Steel Coil Tube (Product No. 1191) manufactured by Wenzhou Jixing Metal Materials Co., Ltd is a precision-engineered continuous-length stainless steel tubing, formed into a compact coil configuration for efficient storage, transportation, and downstream fabrication. This product is specifically designed for applications requiring high corrosion resistance, hygienic integrity, and thermal efficiency — with particular relevance to antibacterial HVAC (Heating, Ventilation, and Air Conditioning) systems used in hospital and medical facility environments.
Based on extensive research literature concerning anti-SARS antibacterial dry coil tube air conditioning systems in hospital wards, this product line addresses the critical need for pathogen-resistant, low-maintenance, and long-life refrigeration and air distribution components in high-sensitivity clinical settings.
Material & Properties
The coil tube is fabricated from high-grade stainless steel alloys, selected to meet the demanding requirements of medical-grade and industrial applications. The following material characteristics define the product's performance envelope:
- Base Material: Austenitic stainless steel (typically Grade 304 / 316L per ASTM A269 / A213 specifications)
- Corrosion Resistance: Superior resistance to chlorides, hospital-grade disinfectants, and atmospheric oxidation
- Surface Finish: Electropolished or passivated inner surface (Ra ≤ 0.4 μm) to inhibit microbial adhesion and biofilm formation
- Mechanical Properties: Tensile strength ≥ 515 MPa; elongation ≥ 40% (annealed condition)
- Thermal Conductivity: Approximately 16.3 W/(m·K) at 20°C — suitable for efficient heat exchange applications
- Operating Temperature Range: −196°C to +870°C (depending on alloy grade)
- Hygienic Compliance: Non-toxic, non-leaching, and free from heavy metal migration
Technical Specifications
| Parameter | Specification | Standard / Reference |
|---|---|---|
| Product Type | Continuous Coil Tube (盘管 / Coiltube) | — |
| Product Number | 1191 | Internal Catalog |
| Material Grade | ASTM A269 TP304 / TP316L (Austenitic Stainless Steel) | ASTM A269 / A213 |
| Outer Diameter (OD) | 6.0 mm – 50.8 mm (configurable) | ISO 1307 / GB/T 14976 |
| Wall Thickness | 0.5 mm – 3.0 mm (tolerance ±0.1 mm) | ASTM A269 |
| Coil Diameter | 500 mm – 1500 mm (configurable) | — |
| Coil Length | 10 m – 500 m (per coil) | — |
| Surface Treatment | Electropolished / Passivated / Mirror Polish | ASTM A967 / A968 |
| End Condition | Plain end / Beveled end / Formed (per customer spec) | — |
| Packaging | Protective wrapping with moisture barrier and coil stand | ISO 4180 |
Manufacturing Process
The production of this coil tube follows a rigorous multi-stage manufacturing sequence to ensure dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Selection: Virgin stainless steel strip is sourced from certified mills, verified via spectroscopic analysis for chemical composition compliance.
- Slitting & Edge Preparation: Coiled strip is slit to precise width with burr-free edges to ensure uniform tube formation.
- Forming (Cold Roll / Push-Pull): The strip is progressively formed into a tubular cross-section using precision tooling, maintaining tight dimensional tolerances throughout.
- Welding (if applicable): For welded coil tube, a high-frequency induction welding process is employed with in-line weld inspection (eddy current / ultrasonic).
- Heat Treatment (Annealing): Stress-relief annealing at controlled temperature (1050°C – 1150°C) followed by controlled cooling to achieve the desired microstructure and mechanical properties.
- Surface Finishing: Electropolishing or chemical passivation removes surface contaminants, eliminates embedded iron particles, and establishes a chromium oxide passive layer.
- Coiling & Inspection: The finished tube is coiled at controlled tension, with 100% dimensional inspection and periodic sampling for mechanical and chemical verification.
- Packaging: Each coil is wrapped in protective material, placed on a dedicated coil stand, and labeled with traceability documentation.
Applications
The stainless steel coil tube is engineered for a broad range of demanding applications, with particular emphasis on the following sectors:
- Medical & Hospital HVAC Systems: Used as antibacterial dry coil tube components in hospital ward air conditioning systems, providing a hygienic, corrosion-resistant alternative to carbon steel tubing. The smooth surface prevents bacterial colonization, reducing the risk of nosocomial infections (including SARS-CoV, influenza, and other airborne pathogens).
- Pharmaceutical & Biotechnology: Process tubing for CIP (Clean-In-Place) and SIP (Sterilize-In-Place) systems requiring strict sanitary standards.
- Food & Beverage Processing: Heat exchangers, condensers, and refrigeration circuits in food-grade environments.
- Chemical Processing: Corrosive fluid transport and heat exchange in aggressive chemical environments.
- Automotive & Aerospace: Fuel lines, hydraulic circuits, and thermal management systems requiring lightweight, durable tubing.
- Heat Exchanger Manufacturing: Raw material for coil-wound condensers, evaporators, and refrigeration coils.
Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management framework to ensure product reliability and regulatory compliance:
- ISO 9001:2015 — Quality Management System certification
- ISO 14001 — Environmental Management System
- ISO 22000 / HACCP — Food Safety Management (for food-grade applications)
- ASME BPE (Bioprocessing Equipment) — For pharmaceutical-grade tubing
- 3-A Sanitary Standards — For dairy and food processing applications
- NSF/ANSI 61 — Drinking water system components (where applicable)
- Material Compliance: Full mill certificates (EN 10204 Type 3.1) provided with each shipment, including chemical analysis, mechanical test reports, and traceability documentation
Unique Selling Points
1. Antibacterial Surface Engineering: The electropolished inner surface with Ra ≤ 0.4 μm finish provides an inherently non-adhesive surface for microorganisms, directly addressing the challenges identified in hospital anti-SARS air conditioning research.
2. Continuous Coil Configuration: Eliminates weld joints along the tube length, reducing potential leak points and contamination pathways — a critical advantage in sterile environments.
3. Full Traceability: Each coil is traceable to the original mill heat number, ensuring complete supply chain accountability.
4. Customization Capability: Flexible in OD, wall thickness, coil diameter, and surface finish to meet project-specific requirements.
5. Extended Service Life: Superior corrosion resistance eliminates the need for periodic replacement, reducing lifecycle costs in hospital and industrial installations.
Note: This product specification is derived from technical literature review (Product No. 1191, Literature Learning Category) related to antibacterial dry coil tube air conditioning systems for hospital environments. For project-specific requirements, contact Wenzhou Jixing Metal Materials Co., Ltd for detailed engineering consultation.