Standard Stainless Steel Coil Tube — Coiled Tubing with Standardized Coil Dimensions (ID ≥ 600 mm, OD ≤ 1200 mm)
1. Product Overview
The Standard Stainless Steel Coil Tube (盘管 Coiltube) is a continuously formed tubular product manufactured by Wenzhou Jixing Metal Materials Co., Ltd. This product is delivered in a coiled configuration with precisely controlled coil dimensions, engineered to meet international logistics and handling standards. The coil tube is produced through seamless or welded forming processes using high-grade austenitic, duplex, or ferritic stainless steel grades, offering exceptional corrosion resistance, mechanical strength, and dimensional accuracy.
Unlike straight-length pipe shipments, coil tubes are wound into a continuous helical configuration, which eliminates the need for butt welding during installation and significantly reduces material waste. The standardized coil dimensions — with an Inner Diameter (ID) of ≥ 600 mm and an Outer Diameter (OD) of ≤ 1200 mm — are specifically designed to ensure compatibility with standard forklifts, overhead cranes, and containerized transport systems, thereby enabling seamless integration into modern supply chain logistics.
2. Material & Properties
Stainless steel coil tubes are available in a wide range of alloy grades to suit diverse industrial applications:
- Austenitic Grades: AISI 304, 304L, 316, 316L, 321, 347 — offering superior corrosion resistance, weldability, and formability.
- Duplex Grades: 2205, 2507 (Super Duplex) — providing enhanced yield strength and resistance to chloride-induced stress corrosion cracking (SCC).
- Ferritic & Martensitic Grades: 409, 430, 410 — selected for specific magnetic or wear-resistant applications.
- Custom Alloys: Alloy 20, Alloy 825, Alloy 625, and other specialty grades upon request.
Key material properties include:
- Corrosion Resistance: Passivation layer formed by chromium oxide (Cr₂O₃) provides inherent resistance to oxidation and chemical attack.
- Mechanical Strength: Yield strength ranging from 205 MPa (Grade 304) to 550 MPa (Grade 2205), with tensile strength up to 800 MPa.
- Temperature Range: Service temperature from cryogenic (-196 °C) to elevated temperatures (up to 870 °C for Grade 304).
- Hygienic Surface: Available with Ra ≤ 0.4 μm (electropolished) or Ra ≤ 0.8 μm (passivated) surface finishes.
3. Technical Specifications
| Parameter | Specification | Standard Reference |
|---|---|---|
| Coil Inner Diameter (ID) | ≥ 600 mm | Company Standard / ISO 4908 |
| Coil Outer Diameter (OD) | ≤ 1200 mm | Company Standard / ISO 4908 |
| Tube Outer Diameter | φ6 mm – φ323.9 mm | ASTM A554 / EN 10217-7 |
| Wall Thickness | 0.5 mm – 20 mm | ASTM A554 / EN 10217-7 |
| Coil Length (Continuous) | Up to 5000 m (typical) | Manufacturer's Standard |
| Coil Weight | Up to 3.0 metric tons per coil | Logistics Standard |
| Surface Finish | 2B, BA, No.4, Electropolished (Ra ≤ 0.4 μm) | ASTM A478 |
| End Preparation | Plain, Beveled (37°/45°), Threaded | ASME B16.11 |
| Manufacturing Method | Seamless (Hot/Cold Drawn) / ERW / Welded & Autoclaved | ASTM A213 / EN 10217 |
| Applicable Standards | ASTM A554, A213, A269, A270; EN 10217-7, EN 10216-5 | — |
| Handling Compatibility | Forklift (palletized), Overhead Crane, Container Loading | ISO 12480 (Handling Devices) |
4. Manufacturing Process
The production of standard coil tubes follows a rigorous multi-stage process to ensure dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Inspection: Incoming stainless steel strip or seamless tube blanks are inspected for chemical composition (spectrometry), mechanical properties, and surface condition in accordance with ASTM A478.
- Coil Forming (Tube Making): The flat strip is fed through a multi-roll forming mill (typically 12–20 stations) to progressively shape the tube profile. The coil configuration is maintained throughout the forming process, eliminating the need for straightening and cutting.
- Welding (for Welded Tubes): Transverse seams are welded using TIG (Tungsten Inert Gas) or ERW (Electric Resistance Welding) processes, followed by full penetration welding (autoclaving) for critical applications.
- Heat Treatment: Solution annealing at 1050–1150 °C followed by controlled cooling (air or water quench) to restore full austenitic microstructure and maximize corrosion resistance.
- Pickling & Passivation: Chemical treatment removes oxide scale (pickling in HNO₃/HF blend) and establishes a protective chromium oxide passive film.
- Precision Coiling: The finished tube is wound onto a precision coiling reel at controlled tension to achieve the target ID ≥ 600 mm and OD ≤ 1200 mm. Tension control ensures uniform coil layering and prevents deformation.
- Non-Destructive Testing (NDT): 100% ultrasonic testing (UT) for wall thickness, eddy current testing (ECT) for surface defects, and hydrostatic testing at 5× working pressure.
- Final Inspection & Packaging: Dimensional verification, surface inspection, and coil bundling with steel strapping, protective end caps, and moisture-absorbent packaging.
5. Applications
The standardized coil tube format is widely adopted across multiple industries due to its handling efficiency and continuous-length advantage:
- Automotive Industry: Exhaust systems, fuel lines, turbocharger piping, and structural reinforcement tubes. Coil format enables high-speed automated tube-feeding machines in mass production lines.
- Food & Beverage Processing: Hygienic fluid transfer lines, CIP (Clean-In-Place) systems, and processing equipment. Electropolished coil tubes meet FDA and EHEDG standards.
- Pharmaceutical & Biotechnology: Process piping, sterilization loops, and sanitary transfer lines requiring Ra ≤ 0.4 μm surface finish.
- Chemical & Petrochemical: Corrosion-resistant process piping, heat exchanger tubes, and reactor internals in aggressive chemical environments.
- Oil & Gas: Subsea pipeline systems, wellhead assemblies, and offshore platform piping utilizing duplex and super-duplex grades.
- Medical Equipment: Surgical instrument shafts, endoscope tubing, and implant manufacturing components.
- Construction & Architecture: Structural framing, decorative handrails, and building facade systems where continuous-length material reduces on-site welding.
6. Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system to ensure product conformity and traceability:
- ISO 9001:2015 — Quality Management System certification covering all manufacturing processes.
- ISO 14001:2015 — Environmental Management System for sustainable production practices.
- ISO 45001:2018 — Occupational Health & Safety Management System.
- CE Marking (EU) — Conformity with European Pressure Equipment Directive (PED 2014/68/EU).
- EN 10204 3.1 Certificates — Third-party material test certificates for each heat lot.
- Mill Test Reports (MTR) — Full chemical analysis, mechanical testing, and dimensional verification for every shipment.
- Material Traceability: Heat number traceability from raw material to finished product, with digital documentation available upon request.
7. Unique Selling Points
The Standard Coil Dimension (ID ≥ 600 mm, OD ≤ 1200 mm) represents a carefully engineered balance between coil stability, material utilization, and logistics compatibility. This dimension set provides the following competitive advantages:
- Universal Handling Compatibility: The coil OD ≤ 1200 mm fits within standard forklift load envelopes and 20-foot shipping containers without special handling equipment. The ID ≥ 600 mm accommodates standard forklift fork insertion and crane lifting lugs.
- Logistics Standardization: Eliminates the need for custom transport solutions, reducing freight costs by up to 30% compared to non-standard coil sizes. Enables efficient palletization and container loading per ISO 12480 guidelines.
- Reduced Material Waste: Continuous coil delivery eliminates butt-joint waste (typically 3–5% in straight-length pipe), delivering measurable cost savings on large-scale projects.
- Production Line Integration: Direct compatibility with automated tube-feeding systems, orbital welding robots, and CNC cutting machines — no intermediate straightening or cutting required.
- Coil Stability & Protection: The balanced ID/OD ratio ensures uniform layer tension, minimizing coil springback and protecting tube geometry during storage and transport.
8. Ordering & Technical Support
Wenzhou Jixing Metal Materials Co., Ltd. offers customized coil tube solutions based on specific project requirements. Technical support includes:
- Material selection guidance and grade recommendation based on service environment.
- Dimensional engineering consultation for coil configuration optimization.
- Sample testing and prototype validation prior to bulk production.
- Logistics planning support for international shipping and customs documentation.
All products are manufactured under full quality traceability with complete documentation packages including Mill Test Reports (MTR), EN 10204 3.1 certificates, and Certificate of Compliance (CoC) upon request.