Stainless Steel Coil Tube (Coiltube) — Product No. 1463
Product Overview
The Stainless Steel Coil Tube (Coiltube), manufactured by Wenzhou Jixing Metal Materials Co., Ltd, is a precision-engineered tubular product supplied in continuous coil form. This product is specifically designed for applications requiring high thermal exchange efficiency, corrosion resistance, and long-term structural integrity in HVAC (Heating, Ventilation, and Air Conditioning) systems, industrial fluid transfer, and process engineering environments. The coil tube configuration enables seamless integration into heat exchanger assemblies, fan coil units (FCU), and fresh air distribution systems where compact footprint and superior heat transfer performance are critical design parameters.
This product represents a specialized category within the stainless steel tubing portfolio, optimized for continuous forming operations that demand consistent wall thickness, dimensional accuracy, and mechanical reliability across extended production runs.
Material & Properties
Wenzhou Jixing Metal Materials Co., Ltd employs premium-grade austenitic and duplex stainless steels conforming to international metallurgical standards. The primary material grades utilized include:
- AISI 304 / SUS 304 (UNS S30408) — General-purpose austenitic stainless steel offering excellent corrosion resistance and weldability, suitable for most HVAC and food-grade applications.
- AISI 316 / SUS 316 (UNS S31608) — Molybdenum-enhanced austenitic grade providing superior resistance to pitting and crevice corrosion in aggressive chemical environments.
- AISI 316L / SUS 316L (UNS S31603) — Low-carbon variant of 316, ideal for welded assemblies where intergranular corrosion resistance is paramount.
- AISI 321 / SUS 321 (UNS S32108) — Titanium-stabilized grade offering enhanced resistance to sensitization at elevated temperatures.
Key Material Properties:
- Corrosion resistance to acids, alkalis, and chlorinated environments
- Non-magnetic (austenitic grades)
- Excellent formability and weldability without pre-heating or post-weld annealing
- Hygienic surface finish suitable for food and pharmaceutical applications
- Temperature service range: −196 °C to +870 °C (depending on grade)
Specifications
| Parameter | Specification | Standard Reference |
|---|---|---|
| Outer Diameter (OD) | 6 mm – 50 mm (customizable) | ASTM A554 / ASTM A269 |
| Wall Thickness | 0.3 mm – 2.0 mm (tolerance ±0.05 mm) | ASTM A554 |
| Coil Inner Diameter (ID) | 200 mm – 600 mm | Manufacturer specification |
| Coil Length per Spool | 50 m – 500 m (configurable) | Customer requirement |
| Surface Finish | Bright Annealed (BA), Pickled & Passivated, or Polished (Ra ≤ 0.4 μm) | ASTM A270 |
| Tensile Strength | ≥ 520 MPa (AISI 304); ≥ 550 MPa (AISI 316) | ASTM A580 |
| Elongation | ≥ 35% | ASTM A580 |
| Hardness | ≤ 95 HRB (annealed condition) | ASTM A580 |
| Dimensional Tolerance | OD: ±0.05 mm; Wall: ±0.05 mm | ASTM A554 |
| End Treatment | Flat cut, deburred, protective end caps | ISO 11286 |
| Packaging | Wooden pallet with moisture-proof wrapping | ISO 4180 |
Manufacturing Process
The production of the Stainless Steel Coil Tube follows a rigorous multi-stage manufacturing protocol:
- Raw Material Selection — Certified stainless steel strip or seamless tube stock sourced from accredited mills, with full chemical composition analysis (Spectrometric Verification) and mechanical property documentation.
- Slitting & Leveling — Precision slitting of coil stock to target width, followed by tension leveling to eliminate coil set and ensure flatness prior to forming.
- Forming / Drawing — Cold-rolling or drawing operations to achieve target OD and wall thickness specifications with controlled strain rates to maintain metallurgical integrity.
- Welding (for welded tubes) — TIG (Tungsten Inert Gas) welding with internal helium backing to achieve consistent, pore-free weld seams conforming to ASME Section IX requirements.
- Bright Annealing & Pickling — Continuous annealing in a controlled hydrogen or nitrogen atmosphere followed by acid pickling to remove scale and restore corrosion resistance.
- Passivation Treatment — Nitric acid or citric acid passivation to establish a chromium oxide protective film on the surface.
- Coiling & Coiling Inspection — Precision coiling onto designated spools with continuous dimensional monitoring via laser measurement systems.
- Final Quality Inspection — 100% visual inspection, dimensional verification, and sample-based destructive testing (tensile, hardness, intergranular corrosion per ASTM A240).
Applications
The Stainless Steel Coil Tube from Wenzhou Jixing Metal Materials Co., Ltd is deployed across multiple high-demand sectors:
- HVAC & Fan Coil Units (FCU) — Primary application for heat exchanger tubes in commercial and industrial air conditioning systems, where the coil tube configuration enables compact serpentine or parallel-flow designs optimized for thermal exchange efficiency.
- Fresh Air System Integration — Used in air handling units (AHU) and ventilation systems where the coil tube serves as the thermal core for pre-conditioning incoming outdoor air, ensuring proper humidity and temperature control prior to distribution.
- Industrial Process Engineering — Chemical processing, pharmaceutical manufacturing, and food-grade fluid transfer systems requiring sanitary, corrosion-resistant tubing.
- Heat Exchanger Manufacturing — Shell-and-tube, plate-fin, and air-cooled heat exchanger assemblies where continuous coil supply reduces welding joints and improves reliability.
- Refrigeration & Cryogenic Systems — Low-temperature applications leveraging the ductility and non-embrittlement characteristics of austenitic stainless steels.
- Automotive & Marine — Exhaust systems, fuel lines, and marine propulsion cooling circuits.
Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management framework ensuring full traceability and compliance with international standards:
- 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 Directive 2014/68/EU (Pressure Equipment Directive)
- EN 10204 3.1 — Third-party inspection certificate for material compliance
- ASTM / ASME Compliance — Full adherence to ASTM A554, A269, A270, and ASME B36.19M
- Mill Test Certificates (MTC) — Provided with every shipment, including chemical analysis, mechanical properties, and dimensional verification
Unique Selling Points
1. Precision Dimensional Control: Advanced laser-based in-line measurement systems ensure OD and wall thickness consistency within ±0.05 mm tolerances across the entire coil length, minimizing downstream processing waste.
2. Superior Surface Integrity: Internal helium-backing TIG welding and bright annealing processes produce weld-free, pitting-free surfaces ideal for hygienic and high-efficiency thermal applications.
3. Customization Flexibility: Full configurability of OD, wall thickness, coil dimensions, and surface finish to match specific OEM requirements for fan coil units and heat exchanger assemblies.
4. Traceability & Documentation: Each coil is serialized with complete material provenance, heat number, and test data, enabling full lifecycle traceability for critical infrastructure applications.
5. Engineering Support: Technical consultation on coil tube integration with fresh air systems and fan coil unit designs, including thermal performance modeling and flow optimization guidance.
Conclusion
The Stainless Steel Coil Tube (Product No. 1463) from Wenzhou Jixing Metal Materials Co., Ltd represents a benchmark in precision stainless steel tubular products for thermal exchange and fluid handling applications. Its combination of metallurgical excellence, dimensional accuracy, and comprehensive quality assurance makes it an ideal choice for OEM manufacturers, HVAC system integrators, and industrial process engineers demanding uncompromising performance and reliability.