Ultra-Long Stainless Steel Coil Tube | 500m–2000m+ Per Coil
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. delivers high-grade stainless steel coil tubes engineered for extreme-length continuous supply, ranging from 500 meters to 2000+ meters per coil. This ultra-long coil capability represents a critical advancement in stainless steel tube manufacturing, enabling seamless deployment in demanding offshore, subsea, and long-distance pipeline applications where joint minimization is paramount.
By maximizing coil length, the product significantly reduces the number of field welds and mechanical couplings required during installation — a decisive advantage in subsea environments where every joint represents a potential failure point and a substantial cost center.
Material & Properties
- Base Materials: 304, 304L, 316, 316L, 321, 310S, and custom alloy grades per ASTM, ASME, EN, and ISO standards
- Corrosion Resistance: Superior resistance to chloride-induced pitting and crevice corrosion, making it ideal for marine and subsea exposure
- Mechanical Strength: High tensile and yield strength maintained throughout the extended coil length, with consistent wall uniformity
- Temperature Performance: Operational range from cryogenic temperatures up to 870°C depending on grade selection
- Formability: Excellent cold-working characteristics enabling downstream bending, forming, and machining without cracking
Specifications
| Parameter | Specification |
|---|---|
| Coil Length | 500 m – 2000+ m per coil |
| Outer Diameter (OD) | 6 mm – 114.3 mm (expandable upon request) |
| Wall Thickness | 0.5 mm – 6.0 mm |
| Coil Inner Diameter | Customizable per customer handling requirements |
| Surface Finish | Pickled & Passivated, BA (Bright Annealed), No. 4 Brushed, or Custom |
| Manufacturing Method | Seamless (Piercing/Plug-rolling) or EFW/Welded per requirement |
| Applicable Standards | ASTM A269, A213, A249; ASME SB-423, SB-424; EN 10216-5; ISO 13679 |
| End Condition | Plain end, Beveled, Threaded, or per customer specification |
| Packaging | Seaworthy coil packaging with protective wrapping and moisture barriers |
Manufacturing Process
Producing stainless steel coil tubes at lengths exceeding 2000 meters demands precision engineering at every stage of the manufacturing chain:
- Raw Material Selection: High-purity stainless steel slabs and billets sourced from certified mills, with full traceability documentation
- Hot Rolling & Piercing: For seamless tubes — controlled piercing and plug-rolling to achieve uniform wall thickness over the entire coil length
- Cold Drawing / Cold Pilgering: Precision cold-working to achieve tight dimensional tolerances (±0.05 mm wall thickness) while maintaining material integrity
- Continuous Coiling: Advanced coiling systems with real-time tension control ensure the tube is wound uniformly without deformation, kinking, or residual stress accumulation
- Heat Treatment: Solution annealing and controlled cooling to optimize grain structure and mechanical properties throughout the extended length
- Pickling & Passivation: Chemical treatment to remove oxide scale and establish a protective chromium oxide passive layer
- In-Line Quality Inspection: Ultrasonic testing (UT), eddy current testing (ECT), hydrostatic pressure testing, and dimensional verification at intervals along the coil
Applications
Subsea Umbilical Cables
Ultra-long coil tubes serve as the backbone of subsea umbilical cable production, where long continuous lengths eliminate splice points that would compromise hydraulic integrity and signal transmission at depths exceeding 3000 meters.
Long-Distance Pipeline Systems
Extended coil lengths dramatically reduce the number of field-welded joints in long-distance pipeline installations — whether offshore flowlines, export pipelines, or onshore process connections — resulting in lower installation costs, reduced leak risk, and faster deployment timelines.
Offshore Platform Services
Designed to minimize marine joints in offshore platform service lines, including chemical injection lines, gas lift lines, and hydraulic control lines where joint reliability directly impacts operational safety.
Additional Applications
- Heat exchanger coil bundles requiring long continuous tube runs
- Automotive exhaust system coil tubing
- Medical and pharmaceutical process piping
- Chemical processing plant instrumentation tubing
- Oil and gas wellhead control line systems
Quality Certifications & Assurance
Wenzhou Jixing Metal Materials Co., Ltd. maintains rigorous quality management systems aligned with international standards:
- ISO 9001:2015 — Quality Management System certification
- ISO 14001 — Environmental Management System
- ISO 45001 — Occupational Health and Safety Management
- API Q1 / API Q9 — Quality management for oil and gas products
- Material Traceability: Full mill certificate traceability from raw steel slab through final product
- Third-Party Inspection: Available upon request — SGS, Bureau Veritas, DNV, Lloyd's Register
- Testing Protocols: 100% hydrostatic testing, ultrasonic flaw detection, spectrometric chemical analysis, and mechanical property verification on every coil
Key Selling Points
• Industry-Leading Coil Length: Up to 2000+ meters per coil — among the longest available in the market, directly translating to fewer joints, lower installation costs, and enhanced system integrity.
• Subsea-Grade Reliability: Purpose-engineered for submarine umbilical and offshore pipeline applications where joint minimization is a safety imperative.
• Consistent Quality Across Length: Advanced in-line inspection ensures uniform mechanical properties, dimensional accuracy, and surface quality throughout the entire coil length.
• Flexible Customization: Custom OD, wall thickness, surface finish, and end condition to meet project-specific requirements.
• Complete Documentation: Full material traceability, mill test certificates, and compliance documentation provided with every shipment.
Ordering Information
For detailed quotations, technical consultation, and custom coil length requirements, contact Wenzhou Jixing Metal Materials Co., Ltd. directly. We support small trial orders and large-volume production runs with competitive lead times and flexible delivery terms.