Stainless Steel Coil Tube (Coiltube) — Wenzhou Jixing Metal Materials Co., Ltd
Product Overview
The Stainless Steel Coil Tube (Coiltube) manufactured by Wenzhou Jixing Metal Materials Co., Ltd is a precision-engineered continuous tube product formed in a coiled configuration. Unlike traditional straight-length tubing, coiltube is produced in continuous helical coils, offering significant advantages in material utilization, production efficiency, and downstream processing flexibility. This product is designed to meet the rigorous demands of industrial applications requiring high corrosion resistance, mechanical integrity, and dimensional accuracy.
Wenzhou Jixing Metal Materials Co., Ltd leverages advanced cold-drawing and seamless tube-forming technologies to produce coiltube products that conform to international standards including ASTM, ASME, EN, and GB specifications. The company's commitment to quality ensures that each coil tube batch undergoes comprehensive testing and certification prior to shipment.
Material & Properties
The coiltube product line is available in a wide range of stainless steel grades, each selected to address specific application requirements:
- Austenitic Grades: SUS304 (ASTM 304), SUS304L (ASTM 304L), SUS316 (ASTM 316), SUS316L (ASTM 316L), SUS321 (ASTM 321), SUS310S (ASTM 310S)
- Ferritic Grades: SUS409, SUS430, SUS439
- Duplex Grades: 2205 (UNS S32205), 2507 (UNS S32750)
- Super Austenitic Grades: Alloy 20 (UNS N08825), Alloy 6 (UNS N06022)
Key Material Properties:
- Corrosion resistance against acids, alkalis, chlorides, and high-temperature oxidation
- Excellent weldability and formability in annealed condition
- Mechanical strength ranging from 520 MPa to 800 MPa depending on grade and condition
- Operating temperature range: −196°C to 870°C (grade-dependent)
Specifications
| Parameter | Specification |
|---|---|
| Outer Diameter (OD) | 3.0 mm – 219.1 mm |
| Wall Thickness | 0.3 mm – 12.0 mm | Coil Length | 1,500 mm – 12,000 mm (standard); custom lengths available | Coil Weight | Up to 3,000 kg per coil | Surface Finish | No. 1 (Annealed), 2B, BA (Bright Annealed), No. 4, Mirror (8K) |
| Tolerance (OD) | ±0.05 mm – ±0.5 mm (per ASTM A213 / ASME B36.19M) |
| Tolerance (Wall Thickness) | ±10% of nominal |
| Standards | ASTM A213, ASTM A269, ASME B36.19M, EN 10217-7, GB/T 12771, GB/T 13296 |
| End Condition | Plain cut, beveled, or threaded (upon request) |
| Packaging | Wooden crate, export-grade pallet with protective wrapping |
Manufacturing Process
The production of stainless steel coiltube at Wenzhou Jixing Metal Materials Co., Ltd follows a rigorous multi-stage manufacturing process:
- Raw Material Inspection: Incoming stainless steel strip or bar stock is verified for chemical composition (via OES spectroscopy) and mechanical properties prior to processing.
- Coiling & Straightening: The continuous tube is wound into uniform coils with controlled tension to prevent deformation and kinking.
- Cold Drawing / Seamless Forming: High-precision dies and mandrels are employed to achieve exact dimensional tolerances and wall uniformity.
- Pickling & Annealing: Tubes are subjected to acid pickling (HNO₃/HF blend) and controlled-temperature annealing to remove scale, restore ductility, and achieve desired grain structure.
- Surface Finishing: Electropolishing, mechanical polishing, or passivation treatments are applied depending on the required surface finish specification.
- Non-Destructive Testing (NDT): Eddy current testing, ultrasonic testing (UT), and hydrostatic pressure testing (typically 5–10 MPa) are performed to detect internal and external defects.
- Final Inspection & Coiling: Dimensional verification, visual inspection, and re-coiling with protective end caps and inter-coil separation.
Applications
The versatile nature of stainless steel coiltube makes it suitable for a broad spectrum of industrial and commercial applications:
- Food & Beverage Industry: Processing lines, sanitary piping, dairy and brewery equipment (304/316L grades)
- Petrochemical & Oil & Gas: Heat exchangers, reactor tubing, transfer lines in aggressive chemical environments (316L, Alloy 20, Alloy 6)
- Pharmaceutical Manufacturing: Clean-in-place (CIP) systems, process piping requiring hygienic surface finishes
- Automotive Industry: Exhaust systems, fuel lines, turbocharger components
- Construction & Architecture: Structural tubing, handrails, decorative applications
- Medical Devices: Instrument tubing, implant-grade components
- Energy Sector: Solar thermal collectors, nuclear-grade components, heat transfer systems
Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management framework supported by the following certifications and compliance credentials:
- ISO 9001:2015 — Quality Management System
- ISO 14001 — Environmental Management System
- EN 10204 3.1 — Material Test Reports (MTR) with third-party verification
- ASTM / ASME — Product conformity to American standards
- CE Marking — European conformity for applicable product categories
- PED (Pressure Equipment Directive 2014/68/EU) — For pressure-containing applications
- NADCAP — Special process certification (where applicable)
Unique Selling Points
- Continuous Coil Configuration: Eliminates weld seams along the tube length, reducing potential failure points and improving flow characteristics in fluid transport applications.
- Superior Material Utilization: Coil production minimizes off-cut waste, delivering cost advantages over straight-length tubing while maintaining identical material properties.
- Customization Capability: Flexible OD, wall thickness, surface finish, and coil length configurations tailored to customer-specific engineering drawings and technical requirements.
- Comprehensive Traceability: Full lot-level traceability from raw mill certificates through final shipment documentation, ensuring compliance with regulated industry standards.
- Competitive Lead Times: Integrated production capacity enables rapid turnaround for both standard and custom orders, supporting just-in-time manufacturing supply chains.
Note: All products are manufactured under strict adherence to applicable international standards. Customers are advised to specify grade, dimensions, surface finish, and applicable code requirements at the time of inquiry to ensure optimal product selection for their intended application.