Stainless Steel Coil Tube (Coiltube) — Ultra-Centrifugal Rotating Bed Liquid Distributor Series

1. Product Overview

The Stainless Steel Coil Tube (Coiltube) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a precision-engineered continuous tubular component formed through the cold-rolling and coiling process. This product is specifically designed for use as a liquid distributor in Ultra-Centrifugal Rotating Beds (UCRB), a class of high-efficiency mass transfer equipment widely employed in chemical, pharmaceutical, and environmental engineering processes. The coil tube geometry provides uniform liquid distribution under extreme centrifugal acceleration (up to 500–1000 × g), ensuring optimal contact between liquid and gas phases within the rotating bed reactor.

Unlike conventional straight-tube or sparger-type distributors, the coiltube configuration leverages the inherent curvature of the tube to promote even flow distribution, reduce channeling effects, and maintain structural integrity under high rotational forces. This design has been validated through rigorous experimental performance studies demonstrating superior mass transfer efficiency and hydraulic stability.

2. Material & Properties

The coil tubes are fabricated from austenitic stainless steels conforming to international standards, selected for their exceptional corrosion resistance, mechanical strength, and processability in aggressive chemical environments.

Primary Material Grades

Key Mechanical & Physical Properties

Property 304 316 316L 321 904L
Tensile Strength (MPa) ≥ 515 ≥ 515 ≥ 485 ≥ 515 ≥ 550
Yield Strength (MPa) ≥ 205 ≥ 205 ≥ 170 ≥ 205 ≥ 275
Elongation (%) ≥ 40 ≥ 40 ≥ 40 ≥ 40 ≥ 40
Density (g/cm³) 7.93 8.00 8.00 7.95 8.00
Thermal Conductivity (W/m·K at 100 °C) 16.3 14.6 14.6 16.3 14.0
Maximum Service Temperature (°C) 870 870 870 870 1000
Carbon Content (%) ≤ 0.08 ≤ 0.08 ≤ 0.03 ≤ 0.08 ≤ 0.08

3. Specifications

Parameter Specification
Product Name Stainless Steel Coil Tube (Coiltube)
Catalog No. 763
Outer Diameter (OD) Φ3.0 mm – Φ32.0 mm (customizable)
Wall Thickness 0.3 mm – 3.0 mm (customizable)
Coil Length 10 m – 500 m per coil (standard); longer lengths available upon request
Coil Diameter Φ100 mm – Φ600 mm (packing diameter)
Tolerance on OD ±0.05 mm (precision grade); ±0.10 mm (standard grade)
Tolerance on Wall Thickness ±0.03 mm (precision grade); ±0.05 mm (standard grade)
Surface Finish 2B (cold-rolled, bright annealed); BA (Bright Annealed); No. 4 Brushed; Electropolished (Ra ≤ 0.4 μm)
End Treatment Clean cut, deburred, beveled, or custom-fitted connectors
Operating Pressure Up to 40 MPa (dependent on OD and wall thickness)
Operating Temperature Range −196 °C to +870 °C (grade-dependent)
Applicable Standards ASTM A269, ASTM A312, GB/T 12771, GB/T 21830, EN 10217-7, ISO 10217-7
Packaging Wooden crate with moisture-proof wrapping; export-standard packaging available

4. Manufacturing Process

The production of stainless steel coil tubes at Wenzhou Jixing Metal Materials Co., Ltd. follows a rigorous multi-stage manufacturing workflow designed to ensure dimensional accuracy, metallurgical integrity, and surface quality:

4.1 Raw Material Selection

Virgin stainless steel coils are sourced from certified mills and subjected to incoming inspection including spectral analysis (OES), chemical composition verification, and mechanical property testing to ensure compliance with the specified grade.

4.2 Slitting & Straightening

The master coil is slit to the required strip width using precision slitting lines. The resulting strip is then straightened to achieve flatness within ±0.1 mm/m, eliminating residual stresses that could compromise the coiling process.

4.3 Forming & Coiling

The flat strip is passed through a series of progressive rolling dies that gradually form the strip into a tubular geometry. The tube is then wound into a coil around a mandrel of the specified coil diameter. This cold-forming process is performed at controlled temperatures to minimize work hardening and maintain dimensional consistency.

4.4 Welding (for welded coil tubes)

Where applicable, the longitudinal seam is welded using TIG (Tungsten Inert Gas) welding or Orbital welding technology with argon shielding on both inside and outside surfaces. The weld is subsequently ground or polished flush to ensure internal surface smoothness, critical for liquid distribution applications.

4.5 Heat Treatment & Annealing

Coiled tubes undergo solution annealing at 1050–1150 °C followed by controlled cooling (air or water quench) to relieve residual stresses, restore full austenitic microstructure, and achieve maximum corrosion resistance. This step is essential for grades such as 316L where intergranular corrosion susceptibility must be eliminated.

4.6 Surface Treatment

Depending on the application requirements, the coil tubes may receive:

4.7 Quality Inspection

Every production batch undergoes comprehensive inspection including:

5. Applications

The stainless steel coil tube is a versatile component with applications spanning multiple high-tech industries:

5.1 Ultra-Centrifugal Rotating Bed (UCRB) Liquid Distributors

This is the primary engineered application. In UCRB systems, the coil tube serves as the liquid distribution network within the rotating bed. Under centrifugal acceleration of 500–1000 × g, the coiltube geometry ensures uniform radial distribution of the liquid phase across the packed bed or structured packing. Research has demonstrated that coiltube-type distributors achieve:

5.2 Chemical Processing & Petrochemical Industry

5.3 Pharmaceutical & Biotechnology

5.4 Food & Beverage Processing

5.5 Environmental Engineering

5.6 Oil & Gas / Marine Engineering

6. Quality Certifications & Compliance

Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system ensuring that all products meet or exceed international standards:

6.1 Management System Certifications

6.2 Industry-Specific Certifications

6.3 Material Traceability

Every coil tube batch is accompanied by a full material traceability package including:

7. Unique Selling Points

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