Mid-Diameter Stainless Steel Coil Tube (Φ12mm – Φ25mm) for Heat Exchanger & Industrial Applications

Product Overview

Wenzhou Jixing Metal Materials Co., Ltd. presents a premium-grade mid-diameter stainless steel coil tube engineered for demanding industrial applications. Designed within the Φ12mm to Φ25mm outer diameter range, this coiltube product line delivers exceptional dimensional precision, superior mechanical integrity, and outstanding corrosion resistance. Manufactured to the highest international standards, these coil tubes are specifically optimized for heat exchanger U-tube assemblies, high-pressure hydraulic piping systems, and CIP (Clean-In-Place) sanitization circuits used across the food, pharmaceutical, and chemical processing industries.

The mid-diameter segment represents a critical performance tier in stainless steel tubing — balancing flow capacity, pressure tolerance, and thermal efficiency. Wenzhou Jixing's mid-diameter coil tubes are produced through advanced cold drawing and precision coiling processes that ensure uniform wall thickness, minimal residual stress, and excellent spring-back characteristics, making them ideal for forming, bending, and tight-tolerance fabrication without compromising structural integrity.

Material & Properties

Wenzhou Jixing Metal Materials offers this mid-diameter coil tube in a range of stainless steel grades tailored to specific service conditions:

All grades are supplied in annealed (soft) condition with a smooth, clean surface finish, ensuring consistent mechanical properties including tensile strength, yield strength, and elongation in accordance with ASTM and EN standards.

Specifications

Parameter Specification
Outer Diameter (OD) Φ12.0 mm – Φ25.0 mm
Wall Thickness 0.5 mm – 2.0 mm (customizable)
Coil Weight Up to 1,500 kg per coil
Surface Finish 2B, BA (Bright Annealed), Polished (Ra ≤ 0.4 μm available)
Tolerance (OD) ±0.10 mm
Tolerance (Wall Thickness) ±10% of nominal
Standards ASTM A213/A269, EN 10216-5, GB/T 14976, JIS G3459
Available Grades 304, 304L, 316, 316L, 321, 316Ti, 310S
Delivery Form Coiled (continuous length), cut-to-length on request
Heat Treatment Fully annealed, stress-relieved

Manufacturing Process

Wenzhou Jixing Metal Materials employs a rigorous multi-stage manufacturing process to ensure the highest quality mid-diameter coil tubes:

  1. Raw Material Selection: Only certified, mill-traced stainless steel wire rod and seamless pipe blanks are accepted. Each batch undergoes spectroscopic analysis to verify chemical composition compliance.
  2. Precision Cold Drawing: Multi-pass cold drawing through precision tungsten carbide dies achieves exact dimensional control within the Φ12–Φ25mm OD range, producing uniform wall thickness and superior surface quality.
  3. Solution Annealing: Tubes are annealed in a protective atmosphere (vacuum or argon) at controlled temperatures to restore ductility, relieve residual stresses, and achieve the desired metallurgical structure.
  4. Precision Coiling: Computer-controlled coiling systems wind the drawn tube into uniform, stress-free coils with consistent helix geometry, minimizing handling damage and ensuring ease of downstream processing.
  5. Non-Destructive Testing: Every coil undergoes 100% eddy current inspection for wall thickness uniformity and surface defect detection, supplemented by hydrostatic pressure testing for leak integrity.
  6. Final Inspection & Packaging: Each coil is dimensionally verified, surface-inspected, and packaged with protective wrapping and moisture barriers to ensure arrival in pristine condition.

Applications

The mid-diameter coil tube from Wenzhou Jixing is purpose-engineered for the following critical applications:

Heat Exchanger U-Tubes

Φ12mm to Φ25mm coil tubes are the ideal diameter range for shell-and-tube heat exchanger U-tube bundles. The pre-coiled geometry reduces fabrication time and welding operations, while the seamless, fully annealed condition ensures superior thermal conductivity, resistance to thermal fatigue, and long service life under cyclic temperature loading. Compatible with both water-to-water and steam-to-oil heat exchange configurations in power generation, petrochemical, and HVAC industries.

Hydraulic Piping Systems

Mid-diameter coil tubes provide optimal pressure-flow characteristics for hydraulic circuits operating at medium to high pressures (up to 400 bar). The seamless construction eliminates weld-induced weak points, while the uniform wall thickness ensures predictable burst pressure and fatigue life. Applications include industrial machinery, aerospace actuator systems, and heavy equipment hydraulic lines where reliability is paramount.

CIP (Clean-In-Place) Cleaning Tubes

In food and pharmaceutical processing, mid-diameter coil tubes serve as CIP circuit piping where smooth internal surfaces are essential for complete chemical contact and thorough cleaning. Available in BA and polished finishes with Ra ≤ 0.4 μm, these tubes prevent product residue accumulation, resist biofilm formation, and withstand repeated exposure to caustic, acidic, and sanitizing solutions without degradation.

Additional Applications

Quality Certifications & Compliance

Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system ensuring full traceability and compliance with international standards:

Unique Selling Points

Wenzhou Jixing Metal Materials Co., Ltd. — Your trusted global supplier of precision-engineered stainless steel coil tubes. With state-of-the-art manufacturing facilities, rigorous quality controls, and decades of industry expertise, we deliver the reliability and performance your critical applications demand.