Stainless Steel Coil Tube — Continuous Stirred Tank Heat Exchanger Element

Manufacturer: Wenzhou Jixing Metal Materials Co., Ltd. (温州吉兴金属材料有限公司)

Product Code: JX-CT-417

Classification: Coil Tube / 盘管 (Coiled Tubing Assembly)

1. Product Overview

The stainless steel coil tube (盘管, Coiltube) is a precision-engineered continuous helical or spiral tubing assembly designed for integration into continuous stirred tank reactors (CSTR, Continuous Stirred Tank Reactor), heat exchangers, and process vessels where controlled residence time distribution (RTD, Residence Time Distribution) is critical. The coil tube functions as an internal heat transfer and mixing augmentation element, providing enhanced thermal exchange surface area within confined vessel geometries while maintaining structural integrity under dynamic hydrodynamic conditions.

Wenzhou Jixing Metal Materials Co., Ltd. specializes in the manufacture of stainless steel coil tubes conforming to international standards, serving industries including chemical processing, pharmaceutical manufacturing, food and beverage processing, and petroleum refining. The product is designed to withstand aggressive chemical environments, elevated temperatures, and mechanical stresses induced by impeller-generated turbulence in stirred tank systems.

Academic Reference: The design and performance parameters of this coil tube product are informed by the research study "Research on Residence Time Distribution of Continuous Stirred Tank with Coil Tube under Different Impeller Types" (《不同桨型下含盘管的连续搅拌釜停留时间分布的研究》), which examines the hydrodynamic interaction between coil tube geometry and various impeller configurations (桨型, impeller types) to optimize mixing efficiency and thermal uniformity.

2. Material & Properties

2.1 Base Material Grades

2.2 Mechanical Properties (Typical for AISI 316L in Annealed Condition)

Property Specification Standard Reference
Tensile Strength (抗拉强度) ≥ 485 MPa ASTM A213 / A269
Yield Strength (屈服强度) ≥ 205 MPa ASTM A213 / A269
Elongation (延伸率) ≥ 40% ASTM A213 / A269
Hardness (硬度) ≤ 217 HB ASTM A262
Thermal Conductivity (热导率) 16.3 W/(m·K) at 300 K ASM Handbook
Maximum Service Temperature (最高使用温度) 870°C (1600°F) ASTM A213
Cryogenic Service Temperature (低温使用温度) −196°C (−320°F) ASTM A269

2.3 Chemical Composition (AISI 316L, wt%)

Element C Si Mn P S Cr Ni Mo N
Maximum 0.03 1.00 2.00 0.045 0.030 — — — 0.10
Minimum — — — — — 16.50 10.00 2.00 —

3. Specifications

3.1 Dimensional Specifications

Parameter Specification Tolerance Standard
Outer Diameter (OD, 外径) φ6.35 mm – φ219.08 mm (¼" – 8") ±0.15 mm ASTM A213 / EN 10216-5
Wall Thickness (WT, 壁厚) 0.50 mm – 12.70 mm (0.020" – 0.500") ±10% of nominal ASTM A213 / EN 10216-5
Coil Diameter (盘管直径) φ100 mm – φ2000 mm (customizable) ±1.0% Customer specification
Coil Pitch (盘管螺距) 10 mm – 150 mm (adjustable per design) ±0.5 mm Customer specification
Coil Turns (盘管圈数) 2 – 200+ turns (as required) — Customer specification
Tube Length (管长) Up to 60 m continuous coil ±50 mm Customer specification
Surface Finish (表面粗糙度) Ra ≤ 0.8 μm (standard); Ra ≤ 0.25 μm (electropolished) — ASTM A269 / GB/T 8170
End Preparation (端部处理) Beveled, plain, threaded, or flanged Per drawing ASME B1.20.1
Material Condition (材料状态) Fully annealed (固溶退火) — ASTM A213

3.2 Coil Geometry Configurations

4. Manufacturing Process

The coil tube manufacturing process at Wenzhou Jixing Metal Materials Co., Ltd. follows a rigorous multi-stage protocol ensuring dimensional accuracy, metallurgical quality, and surface integrity:

  1. Raw Material Selection & Incoming Inspection (原材料选择与来料检验): Certified stainless steel seamless tubes sourced from approved mills, subjected to spectroscopic analysis (光谱分析), mechanical testing, and visual inspection for conformity with ASTM A213/A269 or EN 10216-5 specifications.
  2. Dimensional Verification & Calibration (尺寸验证与校准): Incoming tubes measured for OD, wall thickness, and straightness using precision instruments; tubes outside tolerance are rejected or reprocessed.
  3. Surface Preparation (表面预处理): Tubes undergo degreasing, pickling, and passivation treatment (酸洗钝化) to remove scale, contaminants, and to establish a protective chromium oxide passive film.
  4. Coil Forming / Bending (盘管成型/弯曲): Tubes are coiled using hydraulic or CNC-controlled bending equipment to achieve precise coil diameter, pitch, and turn count. Cold forming (冷成型) is employed for smaller diameters; hot forming (热成型) for larger diameters or thicker walls. Forming parameters are optimized to prevent tube ovality, wrinkling, or wall thinning beyond acceptable limits.
  5. Post-Forming Heat Treatment (成型后热处理): Where required, formed coils undergo solution annealing (固溶热处理) at 1050°C – 1150°C followed by rapid water quenching to restore full austenitic microstructure and relieve residual stresses introduced during forming.
  6. Final Surface Finishing (最终表面处理): Electropolishing (电解抛光), mechanical polishing, or passivation treatment applied per customer specification to achieve required surface roughness and corrosion resistance.
  7. Quality Inspection & Testing (质量检验与测试): Comprehensive inspection including dimensional measurement, hydrostatic pressure testing (水压试验), dye penetrant testing (渗透检测), eddy current testing (涡流检测), and, where applicable, radiographic testing (射线检测) to verify weld integrity and absence of internal defects.
  8. Packaging & Delivery (包装与交付): Coils packaged with moisture-absorbent desiccants and protective end caps, shipped with full material traceability documentation including mill certificates (材质证明书), heat numbers, and test reports.

5. Applications

The stainless steel coil tube is a critical component in a wide range of industrial applications, particularly where controlled thermal management and mixing performance are paramount:

5.1 Continuous Stirred Tank Reactors (CSTR, 连续搅拌釜)

5.2 Heat Exchange Systems (换热系统)

5.3 Process Vessels & Storage (工艺容器与储存)

5.4 Oil & Gas and Petrochemical (石油与天然气/石油化工)

6. Quality Certifications & Compliance

Wenzhou Jixing Metal Materials Co., Ltd. maintains comprehensive quality management systems and product certifications to ensure the highest standards of manufacturing excellence:

6.1 Management System Certifications

6.2 Product & Material Standards