Stainless Steel Heating Coil Tube — Shipboard Thermal Application Series (WX-MC-493)

1. Product Overview

The Stainless Steel Heating Coil Tube (Product Code: WX-MC-493) is a precision-engineered coiled tube assembly manufactured by Wenzhou Jixing Metal Materials Co., Ltd. specifically designed for marine and shipboard heating applications. This product integrates advanced coil-winding technology with high-performance stainless steel materials to deliver reliable thermal transfer performance in demanding maritime environments. The coil tube series is developed in conjunction with automated layout systems that optimize tube arrangement, spacing, and routing for maximum heat exchange efficiency within constrained shipboard spaces.

These coil tubes serve as critical components in shipboard heating circuits, including engine room preheating systems, ballast water heating, fuel oil heating, and process fluid temperature regulation. The product line adheres to international maritime standards and is engineered to withstand the unique challenges of marine environments, including vibration, corrosion, and cyclic thermal loading.

2. Material & Properties

2.1 Material Grades

2.2 Mechanical Properties (Mechanical Properties — 机械性能)

Property (性能) 304 / 304L 316 / 316L 321 / 347 904L 254 SMO
Tensile Strength (抗拉强度), MPa ≥ 520 ≥ 515 ≥ 515 ≥ 550 ≥ 580
Yield Strength (屈服强度), MPa ≥ 205 ≥ 170 ≥ 170 ≥ 205 ≥ 205
Elongation (延伸率), % ≥ 40 ≥ 40 ≥ 40 ≥ 40 ≥ 40
Hardness (硬度), HRB ≤ 92 ≤ 92 ≤ 92 ≤ 92 ≤ 92
Operating Temperature Range (使用温度范围), °C -196 to +870 -196 to +870 -196 to +900 -196 to +1100 -196 to +1100

2.3 Corrosion Resistance (Corrosion Resistance — 耐腐蚀性能)

3. Specifications

3.1 Tube Dimensions (Tube Dimensions — 管径规格)

Parameter (参数) Specification Range (规格范围) Standard Reference (标准参考)
Outer Diameter (OD, 外径) 6.0 mm – 108.0 mm ASTM A213 / EN 10216-5
Wall Thickness (壁厚) 0.5 mm – 6.0 mm ASTM A213 / GB/T 12771
Coil Bend Radius (盘管弯曲半径) 3D – 10D (where D = OD) Custom / Project-Specific
Coil Diameter (盘管外径) 200 mm – 3,000 mm Custom / Project-Specific
Coil Height (盘管高度) 100 mm – 2,000 mm Custom / Project-Specific
Tube Length per Coil (单圈管长) 10 m – 500 m Custom / Project-Specific
Number of Turns (圈数) 5 – 200 turns Custom / Project-Specific
Tolerance on OD (外径公差) ±0.05 mm – ±0.50 mm (per grade) ASTM A213 / EN 10216-5
Tolerance on Wall Thickness (壁厚公差) ±10% (nominal) ASTM A213

3.2 Surface Finish (Surface Finish — 表面光洁度)

Finish Type (光洁类型) Roughness Ra (μm) Application (应用)
Pickled & Passivated (酸洗钝化) 0.4 – 0.8 General marine heating
Electro-polished (电解抛光) 0.1 – 0.2 High-purity fluid heating
Mirror Polish (镜面抛光) ≤ 0.1 Pharmaceutical / food-grade heating
Brushed Finish (拉丝处理) 0.8 – 1.6 Decorative / aesthetic applications

3.3 Connection Types (Connection Types — 连接方式)

4. Manufacturing Process

4.1 Process Flow (Process Flow — 工艺流程)

  1. Raw Material Inspection (原材料检验): Inbound verification of stainless steel seamless or welded tube stock including chemical composition analysis (光谱分析), mechanical property testing, and visual inspection per ASTM A269 / EN 10216-5.
  2. Cutting & Preparation (切割与备料): Precision laser or plasma cutting of tube stock to required lengths. End preparation includes deburring, chamfering, and cleaning to ensure weld integrity.
  3. Coil Bending (盘管弯制): CNC-controlled coil bending machines (数控盘管弯制机) form tubes into precise helical or spiral geometries. The bending process is executed at controlled speeds to prevent ovalization and maintain dimensional accuracy. Bend radii are calculated to ensure minimum 3D bending without wall thinning exceeding 10%.
  4. Heat Treatment (热处理): Solid solution annealing (固溶处理) at 1,010–1,150 °C followed by rapid water quenching to achieve full austenitic microstructure. Stress relief annealing (去应力退火) may be applied post-forming to eliminate residual stresses introduced during bending.
  5. Pickling & Passivation (酸洗钝化): Immersion in nitric-hydrofluoric acid solution (硝酸-氢氟酸混合酸) to remove oxide scale, followed by passivation to establish a stable chromium oxide protective layer. This ensures maximum corrosion resistance.
  6. Surface Finishing (表面处理): Electro-polishing, mechanical polishing, or brushing as specified. Surface roughness is verified using contact profilometry (接触式轮廓仪).
  7. End Connection Fabrication (端部连接加工): Welding of fittings, flanges, or threaded connectors. All welds undergo non-destructive testing (无损检测, NDT).
  8. Hydrostatic Pressure Testing (水压试验): Each coil tube assembly is pressure-tested to 1.5× the maximum design pressure (最大设计压力) for a minimum of 10 minutes with zero leakage tolerance.
  9. Final Inspection & Packaging (终检与包装): Dimensional verification, visual inspection, material traceability documentation, and protective packaging for shipment.

4.2 Automated Layout System Integration (Automated Layout System Integration — 自动布置系统集成)

The coil tube design is developed in conjunction with an automated layout system (自动布置系统) that optimizes the spatial arrangement of heating coil assemblies within shipboard equipment. This system employs computational algorithms to determine optimal coil pitch (盘管间距), tube orientation, and flow distribution to maximize thermal transfer efficiency while minimizing pressure drop. The layout algorithm considers:

5. Applications

5.1 Marine & Shipboard Applications (Marine & Shipboard Applications — 船舶应用)

5.2 Industrial Applications (Industrial Applications — 工业应用)

6. Quality Certifications

6.1 International Standards & Certifications (International Standards & Certifications — 国际标准与认证)

Certification / Standard (认证/标准) Description (描述)
ISO 9001:2015 Quality Management System (质量管理体系)
ISO 14001:2015 Environmental Management System (环境管理体系)
ISO 45001:2018 Occupational Health & Safety Management System (职业健康安全管理体系)
ABS / DNV / LR / BV / CCS Classification Society Material Approval (船级社材料认证)
NACE MR0175 / ISO 15156 Sour Service Material Requirements (酸性服务材料要求)
PED 2014/68/EU Pressure Equipment Directive Compliance (压力设备指令合规)
ASME Section VIII Div. 1 Pressure Vessel & Piping Code (压力容器与管道规范)
EN 10204 3.1 / 3.2 Inspection Certificate (检验证书)

6.2 Testing & Inspection Protocols (Testing & Inspection Protocols — 检测与检验规程)