Stainless Steel Coil Tube — Product Technical Specification

Product Overview

The Stainless Steel Coil Tube (hereinafter referred to as "Coil Tube") is a continuous, seamless tubular product manufactured in coiled form, designed to provide high flexibility, efficient processing, and superior corrosion resistance across a wide range of industrial applications. Produced by Wenzhou Jixing Metal Materials Co., Ltd, this product represents a state-of-the-art solution in the field of stainless steel tube fabrication, adhering to the principles of refined implementation (细化实施) in manufacturing precision and quality control. The Coil Tube is delivered in a continuous coil configuration, enabling high-efficiency downstream processing through automated forming, cutting, and welding operations.

Unlike traditional straight-length tubes, the coil configuration minimizes material waste, reduces cutting losses, and facilitates high-throughput production environments. The product is engineered to meet stringent international standards, ensuring dimensional accuracy, mechanical integrity, and long-term service reliability in demanding environments.

Material & Properties

Material Grades

Mechanical Properties

Corrosion Resistance

Physical Properties

Specifications

Parameter Specification Standard Reference
Outer Diameter (OD) 3.175 mm – 50.8 mm (1/8" – 2") ASTM A778 / ASTM A269
Wall Thickness 0.15 mm – 3.0 mm ASTM A778 / ASTM A269
OD Tolerance ±0.05 mm (standard); ±0.02 mm (precision) ASTM A778
Wall Thickness Tolerance ±0.02 mm (standard); ±0.01 mm (precision) ASTM A778
Coil Length Customizable; typically 50 m – 300 m per coil Manufacturer standard
Surface Finish Mill Finish (2B), No. 4 Brushed, Mirror (8K), Matte ASTM A480 / GB/T 343
Heat Treatment Solution Annealing at 1010°C – 1150°C, followed by water quenching ASTM A213
Maximum Coil Weight Up to 2,000 kg per coil Manufacturer standard
Inner Diameter (ID) OD − 2 × Wall Thickness (derived) Calculated
Temperature Range −196°C to +870°C ASTM A213

Manufacturing Process

1. Raw Material Selection and Inspection

High-purity stainless steel strip is procured from certified mills, undergoing rigorous incoming inspection including chemical composition verification (via Optical Emission Spectrometry, OES), mechanical property testing, and visual surface examination. Only strips meeting or exceeding specification requirements proceed to the forming stage.

2. Cold Roll Forming

The flat stainless steel strip is fed through a series of precision roller stations that progressively form the strip into a tubular cross-section. This cold-forming process ensures tight dimensional tolerances without the need for subsequent welding in seamless configurations. The forming rollers are CNC-machined with micron-level precision to guarantee consistent OD and wall thickness throughout the coil length.

3. Welding (Where Applicable)

For welded coil tube configurations, the formed strip is joined using High-Frequency Resistance Welding (HFRW) or Laser Welding technology. The welding parameters are continuously monitored and controlled to ensure a hermetic, defect-free weld seam with mechanical properties equivalent to the base metal.

4. Solution Annealing and Pickling

The formed tube is subjected to solution annealing at temperatures between 1010°C and 1150°C, followed by rapid water quenching. This process dissolves carbides, restores full austenitic structure, and eliminates residual stresses from cold forming. Subsequent pickling and passivation remove surface oxides and contaminants, establishing a stable chromium oxide passive layer.

5. Precision Dimensional Correction

The annealed coil tube passes through precision sizing rollers and mandrel-drawing stations to achieve final dimensional accuracy. This stage ensures compliance with specified OD and wall thickness tolerances, including tight-tolerance requirements for precision applications.

6. Surface Finishing

Depending on the required surface specification, the coil tube undergoes additional finishing operations including:

7. Final Inspection and Coiling

Each coil undergoes comprehensive final inspection including:

After passing all quality checks, the coil tube is wound onto precision steel cores with protective interlayers to prevent surface damage during storage and transportation.

Applications

Food and Beverage Industry

Stainless steel coil tubes are extensively used in food-grade processing equipment, including milk processing lines, brewery piping, beverage dispensing systems, and sanitary-grade transfer lines. The hygienic surface finish and corrosion resistance meet FDA and 3-A Sanitary Standards.

Pharmaceutical Manufacturing

Used in CIP (Clean-in-Place) systems, pharmaceutical fluid transfer, reactor jacketing, and sterile processing equipment. Compliance with GMP (Good Manufacturing Practice) requirements is ensured through precise surface control and material certification.

Chemical Processing

Employed in chemical transfer lines, heat exchanger tubes, reactor internals, and pipeline systems handling aggressive chemicals, acids, and solvents. The 316L and duplex grades provide exceptional resistance to chloride pitting and stress corrosion cracking.

Automotive and Aerospace

Utilized in exhaust system components, fuel lines, hydraulic systems, and aerospace fluid transfer applications where high temperature resistance and weight efficiency are critical.

Medical Devices

Used in medical instrument tubing, endoscope sheaths, implant-grade applications, and diagnostic equipment housings requiring biocompatibility and sterilization resistance.

Energy and Power Generation

Applied in solar thermal systems, nuclear reactor cooling loops, geothermal extraction tubing, and power plant instrumentation lines requiring wide temperature range performance.

Quality Certifications

International Standards Compliance

Management System Certifications

Testing and Verification

Unique Selling Points

Note: All specifications are subject to verification against the applicable edition of the referenced standards. Custom specifications are available upon request and subject to technical feasibility assessment by Wenzhou Jixing Metal Materials Co., Ltd.