Stainless Steel Coil Tube — Wenzhou Jixing Metal Materials Co., Ltd.
Product Overview
The Stainless Steel Coil Tube (盘管 Coil Tube) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered continuous-length tubular product formed into a coiled configuration for efficient handling, transportation, and downstream processing. Designed to meet rigorous industrial standards, this product serves as a critical intermediate or final component across a broad spectrum of manufacturing applications, including HVAC systems, heat exchangers, fluid conveyance, and structural assemblies. The coil tube form factor eliminates the need for welding joints inherent in straight-length piping, thereby enhancing structural integrity, reducing leak points, and improving overall system reliability.
This product is particularly suited for integration into automated manufacturing lines where continuous feeding is required, such as in heat exchanger coil winding, refrigeration circuit fabrication, and medical device component production. The seamless construction and controlled dimensional tolerances ensure consistent hydraulic and thermal performance throughout the entire length of the coil.
Material & Properties
The Stainless Steel Coil Tube is fabricated from high-grade austenitic and/or ferritic stainless steel grades, selected to provide optimal combinations of corrosion resistance, mechanical strength, and formability. The primary material grades offered include:
- 304 (UNS S30408 / 1.4301) — General-purpose austenitic stainless steel with excellent corrosion resistance and weldability
- 316 (UNS S31608 / 1.4401) — Enhanced corrosion resistance with molybdenum addition for marine and chemical environments
- 316L (UNS S31603 / 1.4404) — Low-carbon variant of 316 for improved weldability and resistance to intergranular corrosion
- 321 (UNS S32108 / 1.4541) — Titanium-stabilized grade for elevated-temperature service
- 304L (UNS S30403 / 1.4307) — Low-carbon variant for critical welding applications
Key Mechanical Properties (Typical — Grade 304, Annealed Condition)
| Property | Specification | Test Method |
|---|---|---|
| Tensile Strength (抗拉强度) | ≥ 520 MPa (75,400 psi) | ASTM A240 / ASTM E8 |
| Yield Strength (屈服强度, 0.2% offset) | ≥ 205 MPa (29,700 psi) | ASTM E8 |
| Elongation (延伸率) | ≥ 40% | ASTM E8 |
| Hardness (硬度, Brinell) | ≤ 201 HB | ASTM E10 |
| Thermal Conductivity (热导率, 20°C) | 16.3 W/(m·K) | ASTM E153 |
| Thermal Expansion (热膨胀系数, 20–100°C) | 17.3 × 10⁻⁶ /°C | ASTM E228 |
| Operating Temperature Range | −196°C to +870°C (−321°F to +1,600°F) | — |
Chemical Composition (Typical — Grade 304)
| Element | Maximum (%) | Element | Range (%) |
|---|---|---|---|
| Carbon (C) | 0.08 | Chromium (Cr) | 18.0 – 20.0 |
| Silicon (Si) | 1.00 | Nickel (Ni) | 8.0 – 10.5 |
| Phosphorus (P) | 0.045 | Manganese (Mn) | ≤ 2.00 |
| Sulfur (S) | 0.030 | Iron (Fe) | Balance |
| — | — | Nitrogen (N) | ≤ 0.10 |
Specifications
| Parameter | Specification / Range | Standard Reference |
|---|---|---|
| Outer Diameter (OD) | 3.0 mm – 168.3 mm (⅛" – 6") | ASTM A511 / ASTM A554 |
| Wall Thickness (WT) | 0.3 mm – 12.7 mm (0.012" – 0.5") | ASTM A511 |
| Coil Inner Diameter (Coil ID) | 200 mm – 1,200 mm (8" – 48") | Manufacturer specification |
| Coil Length (per coil) | 25 m – 200 m (82 ft – 656 ft), customizable | — |
| Dimensional Tolerance — OD | ± 0.1 mm (± 0.004") | ASTM A511 |
| Dimensional Tolerance — WT | ± 10% of nominal | ASTM A511 |
| Surface Finish | No. 1 (Heat Treated), 2B (Cold Rolled & Annealed), No. 4 (Brushed), BA (Bright Annealed), Mirror (8K) | ASTM A480 |
| End Condition | Plain, Beveled, or Threaded (custom) | — |
| Tube Type | Seamless / Welded (ERW or Autogenous Welded & PWHT) | ASTM A511 / ASTM A554 |
| Applicable Standards | ASTM A511, ASTM A554, EN 10217-7, GB/T 14976, JIS G3459 | — |
| Minimum Order Quantity | 500 kg (1,100 lbs) per grade/size | — |
| Packaging | Steel banding, wooden crates, export-grade pallets with VCI protection | ISO 4180 |
Manufacturing Process
The production of the Stainless Steel Coil Tube follows a rigorously controlled multi-stage manufacturing workflow designed to ensure dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Selection & Inspection — Certified stainless steel hot-rolled coils or seamless tube blanks are sourced from approved mills. Incoming material undergoes spectrographic analysis (PMI — Positive Material Identification) and mechanical testing to verify grade compliance and chemical composition.
- Cold Drawing / Seamless Forming — Tube blanks are cold-drawn through precision tooling to achieve target outer diameter and wall thickness. For larger diameters, seamless piercing or autogenous welding followed by Post-Weld Heat Treatment (PWHT) is employed to restore full annealed properties.
- Intermediate Annealing — Multi-pass cold forming is interspersed with solution annealing (1010°C – 1150°C, water quench) to relieve work-hardening and maintain ductility for subsequent forming operations.
- Final Dimensional Finishing — Precision rolling or mandrel drawing achieves final dimensional tolerances. Roundness and straightness are verified at intervals along the coil length.
- Surface Treatment — Depending on the specified finish grade, the tube undergoes pickling and passivation (HNO₃/HF), mechanical polishing, or electrolytic polishing to achieve the required surface roughness (Ra ≤ 0.4 μm for BA finish; Ra ≤ 0.1 μm for Mirror finish).
- Coiling & Spooling — The finished tube is wound onto precision steel spools at controlled tension to prevent ovality, kinking, or surface damage. Coil geometry is verified for uniform layering and stability.
- Final Quality Assurance — Every coil undergoes 100% visual inspection, dimensional verification, hydrostatic pressure testing (where applicable), and optional eddy-current or ultrasonic non-destructive testing (NDT) for internal wall integrity.
- Packaging & Dispatch — Coils are wrapped with protective film, strapped with steel banding, and crated or palletized per export standards. Each shipment is accompanied by a Mill Test Certificate (MTC) in EN 10204 3.1 format.
Applications
The Stainless Steel Coil Tube from Wenzhou Jixing Metal Materials Co., Ltd. is deployed across diverse industrial sectors:
- HVAC & Refrigeration — Heat exchanger coils, condenser and evaporator tubing, fan coil unit circuits, and refrigerant piping systems
- Food & Beverage Processing — Hygienic process piping, CIP (Clean-in-Place) compatible transfer lines, pasteurization circuits, and brewing equipment
- Pharmaceutical & Biotechnology — GMP-compliant process tubing, sterilization loops, and sanitary transfer systems requiring high surface purity
- Chemical & Petrochemical — Corrosive fluid transfer, reactor internals, heat exchanger bundles, and process instrumentation tubing
- Medical Devices — Endoscope tubing, catheter components, and implant-grade tubing (316L)
- Automotive — Exhaust system components, turbocharger piping, fuel delivery lines, and heat management circuits
- Energy & Power Generation — Solar thermal collector tubing, geothermal heat exchangers, and nuclear-grade coolant piping (321/347 grades)
- Oil & Gas — Downhole tubing, flow lines, and subsea connector assemblies
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains comprehensive quality management systems and holds the following certifications ensuring adherence to international standards:
- ISO 9001:2015 — Quality Management System certification covering all manufacturing and distribution operations
- ISO 14001:2015 — Environmental Management System certification
- ISO 45001:2018 — Occupational Health and Safety Management System
- CE Marking — Conformity with European Union machinery and pressure equipment directives (PED 2014/68/EU)
- ASME Stamp — Authorization for pressure vessel and piping components (where applicable)
- NSF/ANSI 61 — Drinking water system components certification (for food-grade applications)
- EN 10204 Type 3.1 — Mill Test Certificate issuance for all product shipments
- RoHS & REACH Compliance — Restricted substance compliance for European market access
Unique Selling Points
1. Seamless Continuity: The coil tube format eliminates butt-weld joints found in straight-length piping, providing uninterrupted flow paths, superior fatigue resistance, and reduced maintenance requirements.
2. Precision Dimensional Control: Advanced cold-drawing and rolling capabilities achieve tight tolerances (± 0.1 mm OD), enabling drop-in replacement and compatibility with automated assembly systems.
3. Comprehensive Grade Portfolio: Availability across multiple stainless steel grades (304, 316, 316L, 321, 304L, and custom alloys) allows engineers to optimize material selection for specific service environments.
4. Surface Finish Versatility: From industrial No. 1 finish to ultra-smooth Mirror (8K) finish with Ra ≤ 0.1 μm, the product accommodates both functional and aesthetic requirements.
5. Customization Capability: Tailored coil dimensions, end treatments, cutting lengths, and packaging configurations support OEM-specific requirements and just-in-time delivery programs.
6. Traceability & Documentation: Full lot traceability from raw material to finished product, supported by EN 10204 3.1 mill certificates, spectrographic reports, and NDT documentation for every shipment.
Technical Notes
Users are advised to specify the intended service environment (temperature, pressure, chemical exposure) during the ordering process to ensure appropriate grade selection and surface finish recommendation. For applications involving cyclic thermal loading or cryogenic service, the 304L or 316L low-carbon grades are recommended to minimize the risk of sensitization and intergranular corrosion. Post-fabrication welding of coil tube components should be performed in accordance with ASME B31.3 or EN 13480 piping codes, with appropriate weld procedure qualification (WPQ) and welder performance qualification (WPQ) documentation maintained.