Stainless Steel Coil Tube — Model 303 (Coiltube Series)
Product Overview
The Stainless Steel Coil Tube Model 303, manufactured by Wenzhou Jixing Metal Materials Co., Ltd., is a precision-engineered continuous coil tube designed for advanced process engineering applications, including flow chemistry, microreactor systems, and photochemical synthesis platforms. This product line embodies the company's commitment to delivering high-performance tubing solutions for demanding industrial and research environments. The coil configuration provides a compact footprint while maximizing surface-to-volume ratio, making it particularly suitable for heat exchange, chemical reaction, and fluid processing applications where space efficiency and thermal management are critical.
Material & Properties
The Model 303 Coil Tube is fabricated from high-grade austenitic stainless steel, selected for its outstanding combination of corrosion resistance, mechanical strength, and formability. The material composition and key properties are as follows:
- Base Material: Austenitic Stainless Steel (UNS 316L / 304 / 316 per specification)
- Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, and general atmospheric corrosion; suitable for exposure to chlorinated media, organic solvents, and oxidizing environments
- Mechanical Properties: Yield strength ≥ 205 MPa (316L); Ultimate tensile strength ≥ 515 MPa; Elongation ≥ 40%
- Temperature Range: Operational range from −196 °C (cryogenic) to +870 °C (continuous); short-term exposure up to +1050 °C
- Surface Finish: Electro-polished or passivated finish with surface roughness Ra ≤ 0.4 μm available upon request
- Magnetic Properties: Non-magnetic or weakly magnetic (μr ≈ 1.02–1.05)
Specifications
| Parameter | Specification |
|---|---|
| Product Model | 303 Coiltube Series |
| Outer Diameter (OD) | 1.0 mm – 25.0 mm (customizable) |
| Wall Thickness | 0.1 mm – 2.0 mm |
| Coil Pitch | 3.0 mm – 50.0 mm (configurable) |
| Coil Length (Uncoiled) | 1 m – 500 m (continuous) |
| Coil Pack Diameter | 50 mm – 500 mm |
| Material Grade | SS 304 / SS 316 / SS 316L / SS 321 / SS 904L |
| Pressure Rating | Up to 40 MPa (PN40) |
| Surface Treatment | Mechanical polished / Electro-polished / Passivated |
| End Preparation | Plain end / Beveled / Flanged / Threaded |
| Manufacturing Standard | ASTM A269 / ASTM A213 / GB/T 12771 / EN 10217 |
| Heat Treatment | Solution annealed and water quenched |
Manufacturing Process
The production of the Model 303 Coil Tube follows a rigorously controlled multi-stage manufacturing process to ensure dimensional accuracy, metallurgical integrity, and consistent performance:
- Raw Material Selection: High-purity stainless steel wire rod is sourced from certified mills with full traceability of chemical composition and heat treatment history.
- Hot Extrusion / Seamless Forming: The wire rod is heated to the austenitizing temperature range (1050–1150 °C) and extruded or formed into tube blanks with precise wall thickness control.
- Cold Drawing: The tube blanks undergo multiple passes of cold drawing through precision-die tooling to achieve final dimensions with tolerances within ±0.05 mm.
- Solution Annealing: Tubes are solution-annealed at 1050–1100 °C followed by rapid water quenching to dissolve carbides, restore full austenitic structure, and maximize corrosion resistance.
- Precision Coiling: The annealed tube is coiled using CNC-controlled coiling machines with variable pitch control, ensuring uniform geometry and minimal residual stress.
- Surface Finishing: Optional electro-polishing (EP) reduces surface roughness to Ra ≤ 0.2 μm, enhancing fluid dynamics characteristics and minimizing microbial adhesion.
- Passivation: Final acid pickling and passivation treatment removes surface contaminants and establishes a protective chromium oxide layer.
- Quality Inspection: Each coil undergoes ultrasonic testing (UT), hydrostatic pressure testing, visual inspection, and dimensional verification per ASTM A269 requirements.
Applications
The Model 303 Coil Tube finds extensive application across multiple high-value industries:
- Flow Chemistry & Microreactors: Coil tubes serve as compact reaction channels in continuous-flow microreactor systems, enabling precise residence time control for exothermic reactions, photochemical synthesis (e.g., in-situ hydrogen peroxide H₂O₂ production), and flow inversion reactor designs. The high surface-to-volume ratio facilitates efficient heat dissipation and mass transfer.
- Pharmaceutical Manufacturing: Used in process piping for sterile fluid transfer, heat exchangers in GMP-compliant facilities, and continuous manufacturing (CM) reactor coils.
- Food & Beverage Industry: Sanitary-grade coil tubing for pasteurization, CIP (Clean-In-Place) systems, and heat exchange in dairy and beverage processing.
- Chemical Processing: Reactor internals, evaporator coils, and heat exchanger elements in petrochemical and fine chemical plants.
- Biotechnology & Bioprocessing: Bioreactor cooling coils, sterile filtration manifolds, and continuous perfusion bioreactor systems.
- Research & Development: Laboratory-scale flow reactors, pilot-scale process intensification platforms, and academic research on heterogeneous catalysis and photochemistry.
- Energy & Semiconductor: Gas delivery coils in semiconductor manufacturing, thermal management in energy systems, and cryogenic applications.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management framework ensuring full regulatory compliance and product reliability:
- ISO 9001:2015 — Quality Management System certification
- ISO 14001:2015 — Environmental Management System certification
- ISO 22000 — Food Safety Management System (for food-grade products)
- ISO 13485 — Medical Device Quality Management System (for pharmaceutical-grade products)
- CE Marking — European Conformity for pressure equipment (PED 2014/68/EU)
- ASTM A269 / A213 — Standard specifications for seamless and welded austenitic stainless steel tubing
- ASME BPE — Biopharmaceutical Equipment and Systems compliance (available for qualified grades)
- Mill Test Reports (MTR): Full chemical analysis, mechanical property data, and heat traceability documentation provided with every shipment
- NACE MR0175 / ISO 15156 — Suitability for sour service environments (select grades)
Unique Selling Points
- Customizable Geometry: Flexible coil pitch, length, and diameter configurations to meet specific process design requirements, from laboratory microreactor coils to industrial-scale heat exchanger elements.
- Ultra-Low Surface Roughness: Electro-polished finish with Ra ≤ 0.2 μm enables superior fluid dynamics performance, minimal fouling, and compatibility with CIP/SIP protocols in pharma and biotech.
- Process Intensification Ready: Optimized for continuous-flow manufacturing and microreactor integration, supporting reaction times from milliseconds to minutes with precise thermal and residence time control.
- Full Traceability: Every coil is accompanied by a complete Mill Test Report with chemical composition, mechanical properties, and dimensional verification data.
- Multi-Grade Availability: Product range spans from standard 304/316 to super-austenitic grades (904L, 6Mo) for the most aggressive chemical environments.
- One-Stop Supply: Integrated manufacturing capability covering raw material sourcing, tube forming, coiling, surface finishing, and end preparation — reducing supply chain complexity and lead time.
Note: Wenzhou Jixing Metal Materials Co., Ltd. provides custom engineering support for specialized applications including photochemical synthesis reactors, flow inversion systems, and other advanced process intensification platforms. Technical consultation and sample evaluation are available upon request.