Stainless Steel Coil Tube (盘管) — Wenzhou Jixing Metal Materials Co., Ltd.
Product Overview
The Stainless Steel Coil Tube (盘管) produced by Wenzhou Jixing Metal Materials Co., Ltd. (Product No. 897) is a precision-engineered continuous coil of austenitic stainless steel tubing, manufactured through cold-rolling and cold-drawing processes. This product is designed to provide seamless, corrosion-resistant tubing in a coiled configuration for downstream forming, cutting, and fabrication applications. The coil form factor enables high-volume, high-speed processing in automated production lines, making it an indispensable material for industrial heat exchangers, refrigeration systems, fluid conveyance, and structural applications.
Wenzhou Jixing Metal Materials Co., Ltd. leverages advanced metallurgical expertise and state-of-the-art rolling mills to deliver coil tubes that meet or exceed international standards including ASTM, EN, JIS, and GB specifications. The product line encompasses a wide range of wall thicknesses, outer diameters, and alloy grades tailored to specific service environments.
Material & Properties
The coil tube is manufactured from high-purity austenitic stainless steel, with the following primary alloy grades available:
- AISI 304 / EN 1.4301 — General-purpose grade with excellent corrosion resistance and weldability.
- AISI 316 / EN 1.4401 — Enhanced resistance to chlorides and pitting corrosion; suitable for marine and chemical environments.
- AISI 316L / EN 1.4404 — Low-carbon variant offering superior weldability and resistance to intergranular corrosion.
- AISI 321 / EN 1.4541 — Titanium-stabilized grade for high-temperature service up to 870 °C.
- AISI 304L / EN 1.4307 — Low-carbon grade for cryogenic and high-welding applications.
Mechanical Properties (Typical — Annealed Condition):
- Tensile Strength (抗拉强度): ≥ 520 MPa (AISI 304); ≥ 515 MPa (AISI 316)
- Yield Strength (屈服强度): ≥ 205 MPa (0.2% offset)
- Elongation (伸长率): ≥ 40% (in 50 mm gauge length)
- Hardness (硬度): ≤ 95 HRB (annealed)
Physical Properties:
- Density (密度): 8.0 g/cm³
- Thermal Conductivity (热导率): 16.3 W/(m·K) at 100 °C (AISI 304)
- Thermal Expansion Coefficient (热膨胀系数): 17.3 × 10⁻⁶ /°C (20–100 °C)
- Maximum Service Temperature (最高使用温度): 870 °C (continuous); 1100 °C (intermittent)
Specifications
| Parameter | Specification | Standard Reference |
|---|---|---|
| Product Type | Stainless Steel Coil Tube (盘管) | — |
| Product No. | 897 | — |
| Outer Diameter (OD) | Φ 3.0 mm – Φ 101.6 mm | ASTM A213 / EN 10216-5 |
| Wall Thickness (WT) | 0.3 mm – 6.0 mm | — |
| Coil Inner Diameter (ID) | Φ 150 mm – Φ 600 mm | — |
| Coil Length | 50 m – 1,200 m (continuous) | — |
| Surface Finish | No. 4 Brushed / 2B / Polished / Pickled | ASTM A480 |
| Heat Treatment | Solution Annealed (固溶退火) at 1010–1150 °C, water quench | — |
| OD Tolerance | ± 0.05 mm (OD < 10 mm); ± 0.10 mm (OD ≥ 10 mm) | ASTM A213 |
| Wall Thickness Tolerance | ± 10% of nominal | EN 10216-5 |
| Roundness | ≤ 0.5% of OD | — |
| Coil Straightness | ≤ 1.0 mm/m | — |
| Packaging | Wooden reel or steel frame, moisture-proof inner wrap | ISO 4180 |
Manufacturing Process
The production of the Stainless Steel Coil Tube follows a rigorous multi-stage manufacturing workflow ensuring dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Preparation: High-purity stainless steel strip (卷带) is procured from certified mills, subjected to incoming inspection including chemical composition analysis (直读光谱仪) and mechanical property verification.
- Slitting & Annealing: The strip is slit to precise width and annealed at 1050–1100 °C in a controlled atmosphere to relieve residual stresses and restore ductility.
- Coil Forming (Rolling): The strip is fed into a precision roll-forming mill where it is gradually shaped into a tubular profile through multiple forming stations. The process is controlled by CNC-driven roller adjustments to maintain tight dimensional tolerances throughout the coil length.
- Welding (if applicable): For welded coil tube, the formed strip undergoes continuous TIG (Tungsten Inert Gas) or laser welding under inert gas shielding (Ar or Ar/He mixture) to produce a clean, low-porosity weld seam. Weld penetration is verified by ultrasonic testing (UT).
- Solution Annealing (固溶处理): The coiled tube is annealed at 1010–1150 °C followed by rapid water quenching to dissolve carbides, restore full austenitic microstructure, and achieve maximum corrosion resistance.
- Pickling & Passivation (酸洗钝化): The tube surface is cleaned using a mixed acid solution (HNO₃ + HF) to remove scale and oxidation, followed by passivation to establish a protective chromium oxide film.
- Surface Finishing: Optional brushing, polishing, or electropolishing is applied to achieve the specified surface finish grade.
- Quality Inspection: Final product undergoes dimensional measurement, hydrostatic pressure testing (水压试验), spectroscopic composition verification, and visual inspection before coiling and packaging.
Applications
The Stainless Steel Coil Tube from Wenzhou Jixing Metal Materials Co., Ltd. serves a broad spectrum of industrial applications:
- Heat Exchangers & Refrigeration (换热器与制冷): Used in shell-and-tube heat exchangers, air conditioning coils, chiller evaporators, and condenser tubes due to excellent thermal conductivity and corrosion resistance.
- Fluid Conveyance Systems: Ideal for sanitary-grade fluid transfer in food and beverage processing, pharmaceutical manufacturing, and chemical plants where hygiene and contamination resistance are critical.
- Automotive Industry: Employed in exhaust system components, turbocharger manifolds, and fuel injection lines requiring high-temperature resistance and durability.
- Building & Construction: Used for structural framing, decorative railings, architectural cladding, and gas piping systems.
- Medical & Laboratory Equipment: Utilized in sterilization chambers, surgical instrument holders, and analytical instrument tubing.
- Energy & Power Generation: Applied in boiler tubes, solar thermal collectors, and nuclear-grade fluid circuits requiring high reliability and radiation resistance.
- Electronics & HVAC: Used in precision cooling loops, electronics thermal management, and ventilation system components.
Quality Certifications & Standards Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains comprehensive quality management and compliance frameworks:
- ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and process control.
- ISO 14001 — Environmental Management System certification for sustainable manufacturing practices.
- ASTM A213 / A269 — Compliance with American Society for Testing and Materials standards for seamless and welded austenitic stainless steel tubing.
- EN 10216-5 / EN 10217-7 — European standard compliance for stainless steel tubes for pressure and non-pressure purposes.
- GB/T 14976 / GB/T 14975 — Chinese National Standard compliance for cold-rolled and cold-drawn stainless steel seamless tubes.
- ASME B36.19M — Compliance for stainless steel pipe dimensions and tolerances.
- CE Marking — European Conformity for pressure equipment directive compliance (PED 2014/68/EU).
- Mill Test Certificates (MTC) — Full EN 10204 3.1 certificates provided with each shipment, including chemical analysis, mechanical test data, and traceability documentation.
Unique Selling Points
Precision Engineering: Advanced CNC roll-forming technology ensures dimensional accuracy within ± 0.05 mm tolerance, reducing downstream machining costs and improving assembly fit.
Superior Surface Integrity: In-house pickling and passivation lines guarantee a uniform, defect-free surface with a protective chromium oxide layer exceeding 200 nm thickness, providing exceptional long-term corrosion protection.
Metallurgical Excellence: Strict control of carbon content (< 0.03% for L-grade alloys) and nitrogen levels ensures optimal mechanical properties and resistance to sensitization during welding.
Flexible Customization: The product line supports custom OD, wall thickness, alloy grade, surface finish, and coil configuration tailored to specific project requirements with rapid turnaround.
Full Traceability: Every coil is traceable to its raw material heat number through a digital quality management system, ensuring complete supply chain transparency and regulatory compliance.
Wenzhou Jixing Metal Materials Co., Ltd. is committed to delivering world-class stainless steel coil tube solutions that combine metallurgical reliability, dimensional precision, and competitive value — serving as a trusted partner in demanding industrial applications worldwide.