Stainless Steel Coil Tube (Coiltube) — Product Technical Specification

Manufacturer: Wenzhou Jixing Metal Materials Co., Ltd.

Product Code: 1340

Category: Coil Tube / Spiral Wound Tube

1. Product Overview

The Stainless Steel Coil Tube (hereinafter referred to as "Coiltube") is a precision-engineered tubular product manufactured by Wenzhou Jixing Metal Materials Co., Ltd. This product is produced by winding seamless stainless steel tubing into a continuous spiral configuration, resulting in a highly efficient, space-optimized heat exchange element. The Coiltube is widely utilized in thermal management systems, refrigeration circuits, ice storage devices, and process heat exchangers where compact geometry, high surface-area-to-volume ratio, and corrosion resistance are critical performance parameters.

The design and application of coil tubes are governed by rigorous theoretical frameworks, as elaborated in the academic study "Theoretical Analysis of Ice Storage Device Design Using Coil Tubes". This research validates the thermodynamic efficiency of coil tube configurations in phase-change energy storage systems, demonstrating that the spiral geometry significantly enhances heat transfer coefficients while minimizing pressure drop and material consumption compared to straight-tube alternatives.

2. Material & Properties

2.1 Base Material

2.2 Mechanical Properties (Typical — SUS304)

2.3 Corrosion Resistance

2.4 Thermal Properties

3. Specifications

Parameter Specification / Range Unit
Outer Diameter (OD) (外径) 3.0 – 108.0 mm
Wall Thickness (壁厚) 0.3 – 6.0 mm
Coil Diameter (盘管直径) 50 – 2000 mm
Tube Length per Coil (单圈管长) 1 – 100 m
Total Tube Length (总管长) 1 – 5000 m
Number of Turns (圈数) 1 – 5000 turns
Pitch (螺距) 1.5 – 20.0 mm
Surface Finish (表面光洁度) Ra 0.1 – Ra 0.8 (Polished); Ra 0.8 – Ra 1.6 (Pickled) μm
End Treatment (端部处理) Plain ends, Threaded ends (NPT/BSP), Flanged ends, Welding preparation —
Pressure Rating (耐压等级) Up to 20 MPa (depending on OD and wall thickness) MPa
Helix Angle (螺旋角) 0° – 15° degrees
Tolerance on OD (外径公差) ±0.05 mm (Precision); ±0.10 mm (Standard) mm
Tolerance on Wall Thickness (壁厚公差) ±10% (Standard); ±5% (Precision) —
Customization (定制) Available upon request per customer drawings and specifications —

4. Manufacturing Process

4.1 Process Flow

  1. Material Selection & Inspection (材料选型与检验): Raw seamless stainless steel tubes are sourced from certified mill suppliers and subjected to incoming quality control (IQC), including chemical composition analysis (光谱分析), dimensional verification, and visual inspection.
  2. Tube Straightening & Cutting (矫直与切割): Incoming coils of tubing are straightened using hydraulic or mechanical straighteners to achieve the required straightness tolerance (≤ 0.3 mm/m). Tubes are cut to specified lengths using high-precision band saws or laser cutting systems.
  3. End Preparation (端部加工): Tube ends are deburred, chamfered, and prepared according to the specified end treatment (threading, welding prep, or flanging).
  4. Coil Forming (盘管成型): The core manufacturing step involves winding the straightened tubing onto a precision mandrel or die set using a CNC-controlled coil winding machine. The machine ensures uniform pitch, consistent helix angle, and accurate coil diameter throughout the winding process. Temperature-controlled environments prevent material cold-work hardening (冷作硬化) and residual stress accumulation.
  5. Heat Treatment (热处理): Where required, coil tubes undergo solution annealing (固溶处理) at 1050–1100 °C followed by rapid water quenching to restore full austenitic microstructure and eliminate residual stresses introduced during cold forming.
  6. Surface Treatment (表面处理): Surface finishing options include acid pickling (酸洗), electropolishing (电解抛光), passivation (钝化), or mechanical polishing to achieve the required surface roughness and corrosion resistance.
  7. Quality Inspection (质量检验): Finished coil tubes undergo comprehensive inspection including dimensional measurement, surface defect detection (using magnetic particle inspection (MPI) or penetrant testing (PT)), pressure testing (水压试验), and hydrostatic testing at 1.5× working pressure.
  8. Packaging & Delivery (包装与交付): Products are packaged in protective wooden crates or custom shipping containers with desiccant packs and anti-corrosion wrapping to ensure integrity during transit.

4.2 Key Manufacturing Technologies

5. Applications

5.1 Ice Storage Systems (储冰系统)

As validated by the theoretical analysis referenced in the product knowledge base, coil tubes are the primary heat exchange elements in ice storage (蓄冰) devices. The spiral configuration maximizes the heat transfer surface area within a compact volume, enabling efficient thermal energy storage during off-peak electricity periods and release during peak demand. The high surface-area-to-volume ratio of the coil tube design reduces the required tank volume by 30–50% compared to traditional shell-and-tube configurations.

5.2 Refrigeration & Air Conditioning (制冷与空调)

5.3 Process Industries (工业过程)

5.4 HVAC & Building Services (暖通空调)

5.5 Specialized Applications

6. Quality Certifications & Standards

6.1 Applicable Standards (适用标准)

6.2 Certifications (认证)

6.3 Testing & Inspection (测试与检验)

7. Unique Selling Points

8. Ordering Information

When placing orders for Stainless Steel Coil Tubes, customers should provide