Stainless Steel Spiral Coil Tube — Seamless Tubing Manufactured via Retrofitted Plate Rolling Process
Product Overview
The Stainless Steel Spiral Coil Tube (Product No. 1417) is a specialized seamless tubing product manufactured by Wenzhou Jixing Metal Materials Co., Ltd. This product represents an innovative engineering solution that leverages a retrofitted plate rolling machine (卷板机) to produce spiral coil tubes from seamless stainless steel pipe stock. The manufacturing methodology described in the technical literature demonstrates a cost-effective and technically viable approach to producing spiral coil tubing configurations that meet stringent industrial specifications.
Unlike conventional coil tubes produced through dedicated coiling equipment, this product utilizes an adapted plate rolling mechanism to achieve precise helical winding of seamless stainless steel pipe. This process innovation reduces capital expenditure on specialized machinery while maintaining the geometric accuracy and metallurgical integrity required for demanding applications.
Material & Properties
The coil tubes are fabricated from high-grade seamless stainless steel pipe (Seamless Stainless Steel Pipe), available in the following common austenitic and duplex grades:
- SUS304 / AISI 304 / EN 1.4301 — General-purpose austenitic grade offering excellent corrosion resistance and formability
- SUS316L / AISI 316L / EN 1.4404 — Enhanced pitting and crevice corrosion resistance suitable for aggressive chemical environments
- SUS321 / AISI 321 / EN 1.4845 — Stabilized grade with improved resistance to intergranular corrosion at elevated temperatures
- SUS310S / AISI 310S / EN 1.4845 — High-temperature grade suitable for sustained service up to 1150°C
Mechanical Properties (Typical for SUS304 Grade):
- Tensile Strength (抗拉强度): ≥ 520 MPa
- Yield Strength (屈服强度): ≥ 205 MPa
- Elongation (延伸率): ≥ 40%
- Hardness (硬度): ≤ 217 HB
Specifications
| Parameter | Specification | Standard Reference |
|---|---|---|
| Product Type | Spiral Coil Tube (Seamless) | — |
| Material Grade | SUS304, SUS316L, SUS321, SUS310S | ASTM A213 / EN 10216-5 |
| Outer Diameter (OD) | Φ12 mm – Φ108 mm | ASTM A554 |
| Wall Thickness | 0.5 mm – 6.0 mm | — |
| Spiral Pitch (螺旋螺距) | 50 mm – 500 mm (customizable) | — |
| Coil Diameter (盘管直径) | 300 mm – 2000 mm | — |
| Tube Length (per coil) | 6 m – 50 m (configurable) | — |
| Surface Finish | Bright Annealed (BA), Pickled & Passivated (2B) | ASTM A473 |
| Tolerance — OD | ±0.1 mm (Precision) / ±0.25 mm (Standard) | ISO 1128 |
| Tolerance — Wall Thickness | ±0.05 mm (Precision) / ±10% (Standard) | — |
| Manufacturing Process | Seamless pipe formed via retrofitted plate rolling machine | — |
Manufacturing Process
The production methodology is centered on the innovative retrofitting of a conventional plate rolling machine (卷板机) to perform spiral coiling operations on seamless stainless steel pipe. The process workflow is as follows:
- Material Selection & Inspection — Seamless stainless steel pipe stock is procured in accordance with ASTM A213 or EN 10216-5 standards. Incoming material undergoes chemical composition analysis (光谱分析), ultrasonic testing (UT), and dimensional verification.
- Machine Retrofit & Configuration — The plate rolling machine is modified with precision guide rollers, hydraulic tension control systems, and angular positioning mechanisms to accommodate tubular stock instead of flat plate. Critical modifications include adjustable roller grooves and a programmable drive system for consistent spiral pitch control.
- Tube Feeding & Alignment — The seamless pipe is fed into the retrofitted rolling assembly with precise axial alignment to ensure uniform helical winding without kinking or ovalization.
- Spiral Coiling Operation — The machine rotates the pipe through a controlled angular displacement while advancing it axially, producing a continuous spiral coil with specified pitch and coil diameter. The process parameters (rotation speed, feed rate, roller pressure) are optimized to prevent work hardening and geometric distortion.
- End Finishing & Deburring — Coil tube ends are trimmed, deburred, and inspected for dimensional accuracy.
- Surface Treatment — Optional pickling and passivation treatment to restore the full corrosion resistance of the stainless steel surface after forming.
- Final Quality Inspection — Comprehensive dimensional checks, visual inspection, and optional hydrostatic pressure testing (水压试验) to confirm product conformity.
Applications
The spiral coil tube finds extensive application across multiple industrial sectors due to its compact configuration, superior heat transfer characteristics, and resistance to fouling:
- Heat Exchangers (换热器) — Spiral coil heat exchangers for oil, chemical, and power generation industries where compact surface area and high heat transfer efficiency are required
- Chemical Processing (化工行业) — Reactor internals, mixing coils, and heat transfer coils in corrosive chemical environments
- Petrochemical Industry (石油石化) — Heat recovery systems, process cooling coils, and instrumentation tubing
- Pharmaceutical & Food Industry — CIP (Clean-In-Place) systems, pasteurization coils, and sanitary heat transfer applications
- Power Generation (发电行业) — Economizer tubes, air preheater coils, and steam generation systems
- Marine Engineering (海洋工程) — Ballast water treatment systems, marine heat exchangers, and offshore platform piping
- Automotive Industry (汽车工业) — Turbocharger cooling coils, fuel system components, and exhaust heat recovery
Quality Certifications & Standards
Wenzhou Jixing Metal Materials Co., Ltd maintains rigorous quality assurance protocols for all coil tube products:
- ISO 9001:2015 — Quality Management System certification ensuring consistent production quality
- ASTM A213 / A554 — Seamless tubing material and dimensional compliance
- EN 10216-5 — European standard for austenitic stainless steel tubes
- GB/T 14976 — Chinese national standard for cold-rolled seamless stainless steel tubes
- Hydrostatic Testing — 100% pressure testing per ASTM A213 requirements
- Material Certification — Mill test certificates (MTC) per EN 10204 3.1 or 3.2 available upon request
Unique Selling Points
1. Cost-Efficient Manufacturing Innovation — The retrofitted plate rolling machine approach eliminates the need for dedicated, high-cost coiling equipment, resulting in competitive pricing without compromising product quality.
2. Seamless Structural Integrity — Unlike welded coil tubes, the seamless base material ensures zero weld-related failure points, providing superior resistance to internal pressure and fatigue loading.
3. Customizable Geometry — Spiral pitch, coil diameter, and tube dimensions are fully configurable to meet specific engineering requirements.
4. Enhanced Heat Transfer Performance — The spiral coil configuration provides a high surface-area-to-volume ratio, enabling compact and efficient thermal exchange systems.
5. Full Material Traceability — Complete documentation from raw material to finished product ensures compliance with international regulatory and industry standards.
Company: Wenzhou Jixing Metal Materials Co., Ltd (温州吉兴金属材料有限公司)
Product Catalogue No.: 1417
Classification: Literature Learning / Technical Reference (文献学习)