Stainless Steel Large-Diameter Coil Tube — ID ≥1000 mm / OD ≤2000 mm
Product Overview
The Stainless Steel Large-Diameter Coil Tube is a premium-grade coiled tubing product engineered and supplied by Wenzhou Jixing Metal Materials Co., Ltd. Specifically designed for extra-long coil tube applications, this product features a large pay-off coil configuration with an inner diameter (ID) of ≥1000 mm and an outer diameter (OD) of ≤2000 mm. The oversized coil format minimizes kinking, distortion, and surface damage during storage and transport, ensuring tube integrity is maintained throughout the entire supply chain. This product line is intended for downstream processors and end-users who require continuous, uninterrupted tube feed in high-volume manufacturing environments.
Material & Properties
The Large-Diameter Coil Tube is available in a range of austenitic and duplex stainless steel grades, each selected to deliver optimal combinations of corrosion resistance, mechanical strength, and formability for demanding industrial applications.
- Common Grades: SUS304, SUS304L, SUS316, SUS316L, SUS321, SUS310S, SUS410, SUS420, and custom duplex grades (e.g., 2205, 2507) upon request.
- Corrosion Resistance: Superior resistance to pitting, crevice corrosion, and general atmospheric corrosion, particularly in 316-series and duplex grades.
- Mechanical Properties: Tensile strength ranging from 515–720 MPa and elongation of 40%–60% depending on grade and temper condition.
- Temperature Performance: Suitable for cryogenic to high-temperature service up to 1100°C (grade-dependent).
- Surface Finish: Available in 2B, BA (Bright Annealed), No.4 hairline, mirror (8K), and custom matte finishes.
Specifications
| Parameter | Specification |
|---|---|
| Product Type | Stainless Steel Coil Tube (Large Coil Format) |
| Coil Inner Diameter (ID) | ≥ 1000 mm |
| Coil Outer Diameter (OD) | ≤ 2000 mm |
| Tube Outer Diameter | 1.5 mm – 219 mm (custom sizes available) |
| Tube Wall Thickness | 0.1 mm – 25 mm (custom tolerances available) |
| Coil Length | Up to 200 m per coil (extendable based on diameter and wall thickness) |
| Manufacturing Method | Seamless / Welded (ERW, TIG, Laser) |
| Available Grades | 304, 304L, 316, 316L, 321, 310S, 410, 420, 2205, 2507, custom |
| Surface Treatment | 2B, BA, No.4, Mirror (8K), Custom |
| Applicable Standards | ASTM A213, ASTM A269, ASME SB167, EN 10217, EN 10216, JIS G3459, GB/T 12771 |
| Special Requirement | Dedicated pay-off / uncoiling equipment required for handling and processing |
| Packaging | Wooden crate, steel banding, or custom export-grade packaging |
Manufacturing Process
The production of Large-Diameter Coil Tube follows a rigorous, multi-stage manufacturing process designed to ensure dimensional accuracy, metallurgical homogeneity, and surface quality at every step:
- Raw Material Selection: Virgin stainless steel slabs or billets are sourced from certified mills, with full chemical composition verification (PMI and spectrographic analysis) prior to processing.
- Hot Rolling / Seamless Forming: Tubes are produced via hot-rolling or piercing processes to achieve the target outer diameter and wall thickness, followed by cold drawing or cold-rolling for precision dimensions.
- Heat Treatment: Solution annealing and controlled cooling cycles are performed to relieve internal stresses, homogenize microstructure, and restore full corrosion resistance after cold working.
- Pickling & Passivation: Tubes undergo acid pickling to remove oxide scale and passivation treatment to establish a stable chromium-rich passive film, enhancing long-term corrosion protection.
- Surface Finishing: Mechanical polishing, electropolishing, or chemical brightening is applied as specified to achieve the required surface finish grade (2B, BA, No.4, or mirror).
- Coiling: The finished tube is wound onto a large-diameter coil (ID ≥1000 mm, OD ≤2000 mm) using precision coiling equipment to prevent deformation, kinking, or surface scratching. Coils are secured with steel strapping and protective edge guards.
- Quality Inspection: Each coil undergoes 100% visual inspection, dimensional verification (OD, wall thickness, straightness), hydrostatic testing (where applicable), and surface defect detection via eddy current or ultrasonic testing.
Applications
The Large-Diameter Coil Tube format is purpose-built for high-volume, continuous-feed manufacturing processes across a wide range of industries:
- Heat Exchanger & Boiler Manufacturing: Ideal for automated tube-cutting and forming lines that require uninterrupted material supply for U-tube, hairpin, and straight tube production.
- Automotive Industry: Used in exhaust systems, fuel lines, turbocharger manifolds, and structural components where long, continuous tube lengths reduce weld joints and improve fatigue life.
- Oil & Gas / Petrochemical: Deployed in heat exchangers, condensers, and process piping systems where resistance to sour gas (H₂S) and chloride-induced corrosion is critical.
- Food & Beverage Processing: Suitable for hygienic-grade piping, pasteurization equipment, and CIP (Clean-In-Place) systems requiring smooth, passivated surfaces.
- Medical & Pharmaceutical: Used in cleanroom piping, sterilization systems, and equipment frames where biocompatibility and surface quality are paramount.
- Furniture & Architectural Fabrication: Enables high-speed CNC bending and cutting operations for decorative handrails, structural frames, and custom architectural elements.
- Energy & Power Generation: Applied in solar thermal collectors, nuclear-grade heat exchangers, and geothermal systems requiring reliable performance under extreme thermal cycling.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system and holds the following certifications to ensure product reliability and global compliance:
- ISO 9001:2015 — Quality Management System certification demonstrating consistent adherence to international quality standards.
- ISO 14001 — Environmental Management System certification confirming responsible environmental practices throughout production.
- EN 10204 3.1 — Full inspection and test documentation provided with every shipment, including chemical analysis, mechanical test results, and dimensional reports.
- Mill Test Certificates (MTC) — Traceable heat-number documentation linking each coil to its raw material origin and processing history.
- Third-Party Inspection — Available upon request through recognized inspection bodies (e.g., SGS, BV, TUV) for pre-shipment verification.
Key Selling Points
- Extra-Long Coil Format: The large-diameter coil design (ID ≥1000 mm, OD ≤2000 mm) enables significantly longer tube lengths per coil compared to standard coil configurations, reducing changeover frequency and maximizing production uptime on automated processing lines.
- Superior Coil Integrity: The generous coil geometry minimizes bending radii, virtually eliminating kinking, ovality, and surface damage that can occur with smaller-diameter coils during storage and handling.
- Full Traceability: Every coil is individually tracked from raw material mill through final inspection, ensuring complete supply chain transparency and regulatory compliance.
- Flexible Customization: Custom tube dimensions, grades, surface finishes, and coil configurations are available to meet specific application requirements and OEM specifications.
- Professional Handling Guidance: Technical support is provided regarding the selection and operation of dedicated pay-off equipment required for this coil format, ensuring optimal downstream processing performance.
Important Note: The Large-Diameter Coil Tube format (ID ≥1000 mm, OD ≤2000 mm) requires the use of dedicated pay-off / uncoiling equipment designed for large coil handling. Standard pay-off systems may not accommodate the coil dimensions and could risk tube deformation or equipment damage. Wenzhou Jixing Metal Materials Co., Ltd. provides technical consultation to assist customers in selecting appropriate pay-off equipment for their specific processing requirements.