Stainless Steel Coil Tube (盘管 Coiltube) — Technical Specification

1. Product Overview

The Stainless Steel Coil Tube (盘管 Coiltube), manufactured by Wenzhou Jixing Metal Materials Co., Ltd., is a continuous-length stainless steel tube wound onto a coil or spool for efficient transport, storage, and downstream processing. Unlike cut-to-length straight pipe, coil tube is supplied in long, unbroken lengths—typically ranging from 500 m to 1,200 m per coil—making it ideal for high-throughput fabrication operations such as bending, forming, welding, and slitting. The coil format eliminates joints and butt-welds over long runs, reducing material waste and improving production efficiency for end-users in plumbing, HVAC, automotive, appliance, and industrial piping sectors.

This product line is engineered to meet the rigorous demands of modern building plumbing network retrofits and new installations, where continuous, leak-resistant piping is essential. The coil tube's seamless or welded construction provides uniform wall thickness, superior corrosion resistance, and consistent mechanical properties throughout its entire length—critical attributes for potable water systems, gas distribution, and chemical processing applications.

2. Material & Properties

2.1 Available Grades

2.2 Mechanical Properties (Typical — Grade 304)

Property Value Unit Standard Reference
Tensile Strength (抗拉强度) ≥ 515 MPa ASTM A213 / A554
Yield Strength (屈服强度) ≥ 205 MPa ASTM A213 / A554
Elongation (延伸率) ≥ 40 % ASTM A213 / A554
Hardness (硬度) ≤ 92 HRB ASTM A262
Density (密度) 8.0 g/cm³ —
Thermal Conductivity (热导率, 100°C) 16.3 W/(m·K) —
Thermal Expansion Coefficient (热膨胀系数, 20–100°C) 16.0 × 10⁻⁶ /K —

2.3 Surface Finish Options

3. Specifications

Parameter Range / Options Notes
Outer Diameter (外径 OD) 3.0 mm – 108.0 mm Custom diameters available upon request
Wall Thickness (壁厚 WT) 0.3 mm – 5.0 mm Tolerance per ASTM A554 ±10%
Coil Length (盘管长度) 500 m – 1,200 m Continuous, joint-free length
Coil Inner Diameter (盘圈内径) 200 mm – 500 mm Adaptable to customer uncoiling equipment
Coil Weight (盘管重量) 500 kg – 5,000 kg Depends on OD, WT, and length
End Form Plain cut, beveled, or flanged Custom end preparations available
Manufacturing Method ERW (电阻焊) / Seamless (无缝) / LSW (激光焊) Selection based on application requirements
Applicable Standards ASTM A213, A554, A778; EN 10216-5, EN 10217-7; GB/T 12771, GB/T 21835 Multi-standard compliance
Passivation Treatment Available (酸洗钝化) Enhances passive chromium oxide film
Packaging Wooden pallet, steel banding, moisture-proof wrapping Export-grade packaging for international shipment

4. Manufacturing Process

The production of stainless steel coil tube at Wenzhou Jixing Metal Materials Co., Ltd. follows a rigorous, multi-stage process designed to ensure dimensional accuracy, metallurgical integrity, and surface quality:

  1. Strip Preparation (钢带准备) — Cold-rolled stainless steel strip is inspected for thickness uniformity, surface defects, and chemical composition compliance. Incoming material is verified via spectrometric analysis (光谱分析) to confirm grade-specific elemental percentages.
  2. Forming & Welding (成型与焊接) — The strip is fed through a series of progressive rollers (多辊成型) that incrementally form the flat strip into a circular cross-section. For welded tube, the edges are joined via Electric Resistance Welding (ERW, 电阻焊) or Laser Welding (LSW, 激光焊) with continuous in-line monitoring of weld seam quality.
  3. Heat Treatment (热处理) — The formed tube undergoes solution annealing (固溶退火) in a continuous bright-burnish furnace (CBBF) or controlled-atmosphere annealing furnace. This step dissolves carbides, relieves residual stresses, and restores full austenitic properties.
  4. Pickling & Passivation (酸洗钝化) — The annealed tube is cleaned of oxide scale via acid pickling, followed by passivation treatment to form a stable chromium oxide (Cr₂O₃) passive film, enhancing long-term corrosion resistance.
  5. Coiling (盘绕) — The finished tube is wound onto a coil at controlled tension to prevent ovality or kinking. Coiling tension and speed are precisely regulated to maintain dimensional tolerances along the entire length.
  6. Quality Inspection (质量检验) — Every coil undergoes non-destructive testing (NDT, 无损检测), including Eddy Current Testing (ECT, 涡流检测) for weld seam integrity, Hydrostatic Testing (水压试验) for pressure resistance, and dimensional measurement of OD, WT, and roundness.
  7. Packaging & Dispatch (包装与发货) — Coils are secured on export-grade wooden pallets, wrapped with moisture-barrier material, and banded with high-strength steel strapping for safe domestic and international transport.

5. Applications

5.1 Building Plumbing & Pipe Network Systems (建筑管网系统)

Stainless steel coil tube is the preferred material for residential and commercial building plumbing networks (楼盘管网), particularly in retrofit and renovation projects. Its continuous-length format allows for push-fit or press-fit connection systems that eliminate soldering and threading, dramatically reducing installation time and leak risk. The coil tube's corrosion resistance ensures decades of service life in potable water (饮用水), domestic hot water (生活热水), and compressed air (压缩空气) distribution systems.

5.2 HVAC & Refrigeration (暖通空调与制冷)

Used as refrigerant piping (制冷剂管道) and condenser tubing (冷凝器管) in air conditioning units, heat exchangers (换热器), and industrial refrigeration systems. The high thermal conductivity and corrosion resistance of austenitic grades make coil tube ideal for environments exposed to moisture and chemical coolants.

5.3 Automotive & Industrial Piping (汽车与工业管道)

Employed in fuel lines (燃油管), exhaust systems (排气系统), brake lines (制动管路), and hydraulic circuits (液压回路). The coil format enables automated tube-rolling machines (自动弯管机) to produce complex-shaped components with minimal material waste.

5.4 Food & Pharmaceutical Processing (食品与制药加工)

316L-grade coil tube is widely used in sanitary piping (卫生管道) for food processing plants, breweries (酿酒厂), dairy facilities (乳制品厂), and pharmaceutical manufacturing (制药生产). The BA and EP surface finishes meet FDA and 3-A Sanitary Standards, preventing microbial adhesion and enabling clean-in-place (CIP, 原位清洗) protocols.

5.5 Chemical & Petrochemical Industry (化工与石化行业)

Duplex and super duplex grade coil tubes (双相钢盘管) are specified for aggressive chemical environments, offshore platforms (海上平台), desalination plants (海水淡化厂), and acid/alkali handling systems. Their high pitting resistance equivalent number (PREN ≥ 38) provides exceptional resistance to chloride-induced stress corrosion cracking (Cl-SCC, 氯化物应力腐蚀开裂).

6. Quality Certifications & Compliance

Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management framework ensuring that every coil tube product meets international and domestic standards:

7. Unique Selling Points

Continuous Joint-Free Length: Up to 1,200 m per coil eliminates butt-welds and mechanical joints, reducing leak points by up to 95% compared to cut-to-length pipe in long-run installations.

Multi-Grade Flexibility: Availability of austenitic, ferritic, duplex, and super duplex grades in a single coil tube product line allows customers to optimize material selection for cost, corrosion resistance, and mechanical performance without changing suppliers.

Retrofit-Ready Design: Specifically engineered for building plumbing network renovations (楼盘管网整改), the coil tube integrates seamlessly with push-fit and press-fit connection systems, enabling rapid installation in occupied buildings with minimal disruption.

Full Traceability: Each coil is heat-number marked (炉号标识) and accompanied by a complete mill test certificate (MTC, 材质证明书), enabling full material traceability from raw strip to finished product.

Customization Capability: Non-standard OD, WT, coil dimensions, surface finishes, and end preparations are available through a dedicated engineering support team, ensuring exact fit for specialized applications.

8. Ordering & Technical Support

Customers are advised to specify the following parameters when placing an order to ensure optimal product selection:

Wenzhou Jixing Metal Materials Co., Ltd. provides pre-sales engineering consultation, post-sales technical support, and on-site installation guidance to ensure successful project execution from specification through commissioning.