Stainless Steel Coil Tube (Coiltube) — Product Technical Specification
1. Product Overview
The Stainless Steel Coil Tube (Coiltube), manufactured by Wenzhou Jixing Metal Materials Co., Ltd., is a precision-engineered seamless stainless steel tubing product supplied in continuous coil form. Designed to meet and exceed national and international standards, this product combines superior corrosion resistance, mechanical integrity, and dimensional accuracy, making it suitable for demanding industrial and commercial applications including HVAC systems, heat exchangers, fluid transportation, and structural components.
Wenzhou Jixing Metal Materials Co., Ltd. has established itself as a leading producer of stainless steel coil tubes in China, adhering to rigorous quality control protocols throughout the manufacturing lifecycle. The company's commitment to excellence is reflected in the consistent performance and reliability of its product line.
2. Material & Properties
2.1 Material Grades
- 304 (AISI 304 / UNS S30400): The most widely used austenitic stainless steel grade, offering excellent general corrosion resistance, formability, and weldability. Contains approximately 18% Chromium (Cr) and 8% Nickel (Ni).
- 304L (AISI 304L / UNS S30403): A low-carbon variant of 304 with carbon content ≤ 0.03%, providing enhanced resistance to intergranular corrosion after welding.
- 316 (AISI 316 / UNS S31600): Contains 2–3% Molybdenum (Mo), offering superior resistance to pitting and crevice corrosion, particularly in chloride-containing environments.
- 316L (AISI 316L / UNS S31603): Low-carbon version of 316, ideal for welded assemblies requiring excellent corrosion performance.
2.2 Mechanical Properties
| Property | 304 / 304L | 316 / 316L |
|---|---|---|
| Tensile Strength (抗拉强度) | ≥ 515 MPa (74,700 psi) | ≥ 515 MPa (74,700 psi) |
| Yield Strength (屈服强度) | ≥ 205 MPa (29,700 psi) | ≥ 205 MPa (29,700 psi) |
| Elongation (延伸率) | ≥ 40% | ≥ 40% |
| Density (密度) | 8.0 g/cm³ | 8.0 g/cm³ |
| Thermal Conductivity (热导率) | 16.3 W/(m·K) at 300°C | 16.3 W/(m·K) at 300°C |
| Operating Temperature Range (使用温度范围) | −196°C to +870°C | −196°C to +870°C |
2.3 Chemical Composition (Typical)
| Element | 304 | 316 |
|---|---|---|
| Chromium (Cr, 铬) | 18.0–20.0% | 16.0–18.0% |
| Nickel (Ni, 镍) | 8.0–10.5% | 10.0–14.0% |
| Molybdenum (Mo, 钼) | — | 2.0–3.0% |
| Carbon (C, 碳) | ≤ 0.08% | ≤ 0.08% |
| Manganese (Mn, 锰) | ≤ 2.0% | ≤ 2.0% |
| Silicon (Si, 硅) | ≤ 1.0% | ≤ 1.0% |
| Phosphorus (P, 磷) | ≤ 0.045% | ≤ 0.045% |
| Sulfur (S, 硫) | ≤ 0.030% | ≤ 0.030% |
3. Specifications
| Parameter (参数) | Specification (规格) |
|---|---|
| Product Name (产品名称) | Stainless Steel Coil Tube (盘管 Coiltube) |
| Product Category (产品分类) | Seamless Stainless Steel Tubing — Coil Form |
| Outer Diameter (外径, OD) | 6.0 mm – 108.0 mm (custom sizes available) |
| Wall Thickness (壁厚) | 0.5 mm – 6.0 mm |
| Coil Length (盘管长度) | Customizable; typically 10 m – 200 m per coil |
| Surface Finish (表面状态) | Bright Annealed (BA), No.4 Brushed, 2B, Polished, or Sandblasted |
| Tolerance — OD (外径公差) | ±0.05 mm (precision grade); ±0.1 mm (standard grade) |
| Tolerance — Wall Thickness (壁厚公差) | ±10% of nominal |
| End Condition (端部状态) | Plain, Beveled (坡口), or Threaded (per customer requirement) |
| Packaging (包装) | Export-standard wooden crates or bundled coil with protective wrapping |
| Applicable Standards (适用标准) | GB/T 14976, GB/T 13296, ASTM A213, ASTM A269, EN 10216-5, JIS G3459 |
4. Manufacturing Process
The production of high-quality stainless steel coil tubes follows a meticulously controlled multi-stage process:
- Raw Material Selection (原材料选用): Premium-grade stainless steel billets or wire rods sourced from certified mills, subjected to incoming spectral analysis (光谱分析) for chemical composition verification.
- Hot Rolling / Drawing (热轧/拉拔): Tubes are formed through piercing, hot rolling, and subsequent cold drawing to achieve precise dimensional tolerances and superior mechanical properties.
- Heat Treatment (热处理): Solution annealing (固溶处理) at temperatures between 1010°C and 1150°C followed by controlled cooling to achieve uniform austenitic microstructure and optimal corrosion resistance.
- Pickling & Passivation (酸洗钝化): Chemical cleaning to remove oxide scale, followed by passivation treatment to form a protective chromium oxide layer on the surface.
- Surface Finishing (表面处理): Mechanical polishing, electropolishing, or brushing to achieve the desired surface roughness and aesthetic appearance.
- Quality Inspection (质量检验): Comprehensive testing including ultrasonic testing (UT), eddy current testing (涡流检测), dimensional measurement, and hydrostatic pressure testing.
- Coiling & Packaging (卷取包装): Tubes are wound into coils using precision coiling equipment to prevent deformation, then packaged for safe transport.
5. Applications
- HVAC & Fan Coil Units (暖通空调及风机盘管): Used as heat exchange tubes in air handling units, chiller systems, and fan coil units (风机盘管), leveraging excellent thermal conductivity and corrosion resistance.
- Chemical Processing (化工处理): Transport and processing of aggressive chemicals, acids, and solvents in pipelines and reactor systems.
- Food & Pharmaceutical Industry (食品及制药行业): Hygienic-grade tubing for dairy, beverage, and pharmaceutical processing equipment requiring cleanability and non-reactivity.
- Oil & Gas Industry (石油天然气行业): Downhole tubing, wellhead equipment, and offshore platforms where chloride resistance is critical.
- Automotive & Aerospace (汽车及航空航天): Exhaust systems, fuel lines, and structural components requiring high-temperature stability and fatigue resistance.
- Construction & Architecture (建筑与结构): Decorative and structural applications in modern architectural designs.
6. Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains comprehensive quality management systems ensuring that all products meet or exceed applicable standards:
- ISO 9001:2015: Quality Management System certification demonstrating commitment to consistent quality and continuous improvement.
- ISO 14001:2015: Environmental Management System certification reflecting responsible environmental practices in production.
- CE Marking: Conformity with European health, safety, and environmental protection standards.
- NB Certification (National Supervision Inspection): Compliance with Chinese national standards (GB) for pressure-bearing applications.
- Mill Test Certificates (MTC, 材质证明书): Each batch accompanied by EN 10204 Type 3.1 certificates documenting chemical composition and mechanical test results.
7. Unique Selling Points
Comprehensive National Standard Compliance: Wenzhou Jixing's coil tube products have been verified to fully meet Chinese national standards (GB/T), with quality and performance characteristics validated through rigorous third-party testing and internal quality audits.
- Precision Dimensional Control: Advanced cold-drawing technology ensures tight tolerances and uniform wall thickness throughout the entire coil length.
- Superior Surface Quality: Multi-stage pickling and passivation processes deliver a clean, corrosion-resistant surface ready for immediate application.
- Customization Capability: Flexible manufacturing capacity supports custom OD, wall thickness, coil length, surface finish, and end conditions to meet specific project requirements.
- Material Traceability: Full traceability from raw material to finished product, ensuring accountability and quality assurance at every stage.
- Cost-Effective Coil Form: Supplied in coil configuration to minimize material waste during downstream processing and reduce fabrication costs for high-volume applications.
8. Technical Notes
When selecting stainless steel coil tubes for specific applications, engineers should consider the following factors:
- Operating environment (temperature, pressure, corrosive media)
- Mechanical loading conditions (tensile, compressive, cyclic)
- Welding requirements and post-weld treatment needs
- Regulatory and code compliance requirements for the target industry
- Long-term durability and maintenance expectations
Wenzhou Jixing Metal Materials Co., Ltd. provides technical consultation and material selection guidance to ensure optimal product performance and service life for each application scenario.