Stainless Steel Coil Tube for Disc Chain Conveyor Systems
Manufacturer: Wenzhou Jixing Metal Materials Co., Ltd
Product Designation: Coil Tube (Coiltube) — Product No. 668
Classification: Technical Documentation & Engineering Reference
Product Overview
The Stainless Steel Coil Tube is a precision-engineered tubular component designed for integration into Disc Chain Conveyor Systems (圆盘管链输送机), a class of energy-efficient and environmentally friendly material conveying equipment. These coil tubes serve as the primary structural conduit through which bulk materials are transported via rotating disc chains, offering a closed-loop conveying solution that minimizes material spillage, reduces dust generation, and lowers overall energy consumption compared to traditional open-belt conveyors.
Manufactured by Wenzhou Jixing Metal Materials Co., Ltd, this coil tube product is engineered to meet the demanding requirements of industrial conveying applications across pharmaceutical, food processing, chemical, and environmental engineering sectors. The continuous coil form factor enables efficient material handling with reduced mechanical wear and extended service life.
Material & Properties
The coil tubes are fabricated from high-grade austenitic stainless steel, selected for superior corrosion resistance, mechanical integrity, and hygienic performance. The following material characteristics define the product's operational envelope:
- Base Alloy: SUS304 (ASTM A270 Type 304) or SUS316L (ASTM A270 Type 316L), depending on application-specific corrosion requirements
- Chromium Content: 18–20% minimum, providing robust passive film formation and oxidation resistance
- Nickel Content: 8–10.5%, ensuring austenitic microstructure stability across operating temperatures
- Molybdenum Content (316L grade): 2–3%, enhancing pitting and crevice corrosion resistance in chloride-rich environments
- Surface Finish: Electro-polished or brushed finish with surface roughness Ra ≤ 0.8 μm for hygienic-grade applications
- Operating Temperature Range: −196°C to +870°C (304 grade); −196°C to +925°C (316L grade)
- Yield Strength: ≥ 205 MPa (304); ≥ 170 MPa (316L)
- Tensile Strength: ≥ 515 MPa (304); ≥ 485 MPa (316L)
- Elongation at Break: ≥ 40% (304); ≥ 35% (316L)
Specifications
| Parameter | Specification | Standard Reference |
|---|---|---|
| Outer Diameter (OD) | 19 mm / 25 mm / 32 mm / 38 mm / 51 mm (customizable) | ASTM A270 / GB/T 12771 |
| Wall Thickness | 1.0 mm – 3.0 mm (tolerance ±10%) | ASTM A270 |
| Coil Length | Standard: 3 m – 12 m per coil; Custom lengths available upon request | Manufacturer Specification |
| Bend Radius | ≥ 3× OD (minimum); ≥ 5× OD recommended for high-cycle fatigue applications | ASME B31.3 |
| Straightness Tolerance | ≤ 1.5 mm per meter | GB/T 12771 |
| End Condition | Plain end, beveled end, or threaded end (BSPP/BSPT/NPT) | ISO 14286 |
| Coil Form | Continuous helical coil; center-wound or end-wound configuration | Manufacturer Specification |
| Surface Treatment | Pickled & passivated; optional electro-polishing (Ra ≤ 0.4 μm) | ASTM A967 |
| Welding Method | Orbital TIG (GTAW) — seamless; ER308L/ER316L filler wire | ASME Section IX |
| Packing | Wooden crate with moisture-proof wrapping; coil secured with steel bands | ISO 4180 |
Manufacturing Process
The production of stainless steel coil tubes follows a rigorous multi-stage manufacturing protocol to ensure dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Procurement & Inspection: Cold-rolled stainless steel strip is sourced from certified mills and subjected to incoming quality control (IQC), including chemical composition verification via optical emission spectrometry (OES) and mechanical property testing.
- Pipe Forming: The strip is fed through a series of roll-forming stations to produce the initial tubular geometry. Precision rollers maintain tight dimensional tolerances throughout the forming process.
- Welding: The formed strip is welded along the longitudinal seam using automated orbital TIG (Tungsten Inert Gas) welding under a shielding atmosphere of high-purity argon (99.99%). This produces a continuous, leak-tight weld bead with minimal heat-affected zone (HAZ) distortion.
- Coil Forming & Bending: The welded pipe is cold-bent into the desired coil geometry using CNC-controlled bending equipment. The bend radius is maintained at or above the minimum specified value to prevent ovality and wall thinning.
- Heat Treatment: Where required, solution annealing is performed at 1050°C – 1150°C followed by rapid water quenching to restore full austenitic microstructure and maximum corrosion resistance.
- Pickling & Passivation: The finished coil tube is cleaned via acid pickling (nitric-hydrofluoric acid blend) to remove oxide scale, followed by passivation treatment to restore the chromium-rich passive film on the surface.
- Final Quality Inspection: Each coil undergoes dimensional verification (OD, wall thickness, straightness), visual inspection of weld seams, and optional non-destructive testing (NDT) including dye penetrant testing (PT) or eddy current testing (ET).
Applications
Stainless steel coil tubes from Wenzhou Jixing Metal Materials Co., Ltd are integral components in the following industrial domains:
- Pharmaceutical Manufacturing: Closed-loop conveying of powders, granules, and tablets within GMP-compliant facilities. The hygienic surface finish prevents product contamination and facilitates CIP (Clean-In-Place) and SIP (Sterilize-In-Place) protocols.
- Food & Beverage Processing: Transport of food-grade materials including dairy powders, spices, confectionery, and grain products. SUS304/316L compliance ensures adherence to FDA and EU food safety regulations.
- Chemical & Petrochemical Industry: Conveying of corrosive chemical powders, pigments, and catalysts. The 316L grade provides enhanced resistance to acids, alkalis, and chloride-containing media.
- Environmental Engineering: Sludge handling, waste material transport, and flue gas desulfurization (FGD) system integration where durable, corrosion-resistant conveying solutions are required.
- Cement & Mineral Processing: High-volume bulk material transport in enclosed environments where dust control and energy efficiency are paramount.
- Power Generation: Coal ash handling and boiler auxiliary systems requiring high-temperature resistant conveying infrastructure.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd maintains a comprehensive quality management system and holds the following certifications and complies with the following international standards:
- ISO 9001:2015 — Quality Management Systems certification, demonstrating systematic quality control across all production processes
- ISO 14001:2015 — Environmental Management Systems certification, reflecting commitment to sustainable manufacturing practices and energy-efficient production
- ASME BPV Code — Compliance with American Society of Mechanical Engineers Boiler and Pressure Vessel Code for pressure-containing applications
- ASTM A270 — Adherence to standard specification for welded austenitic stainless steel seamless and welded stainless steel tubing
- GB/T 12771 — Chinese National Standard for welded stainless steel tubes for general application
- CE Marking — European Conformity marking for products intended for the European Economic Area market
- EN 10217 — European Standard for welded stainless steel tubes for pressure purposes
- 3-A Sanitary Standards — Compliance with International Dairy Food & Beverage Equipment Sanitary Standards for food-grade applications
Unique Selling Points
1. Energy Efficiency: The coil tube design integral to disc chain conveyor systems reduces energy consumption by up to 40% compared to conventional belt conveyors, owing to minimized friction losses and optimized material flow dynamics.
2. Environmental Sustainability: The enclosed conveying pathway eliminates material spillage and airborne particulate release, contributing to a cleaner production environment and reduced waste disposal requirements.
3. Extended Service Life: The corrosion-resistant stainless steel construction, combined with the reduced mechanical stress inherent to the coil tube geometry, extends operational lifespan significantly beyond carbon steel alternatives.
4. Versatile Configuration: Customizable OD, wall thickness, coil length, and surface finish options enable seamless integration into diverse conveyor system architectures.
5. Hygienic Design: Electro-polished surfaces with Ra ≤ 0.4 μm meet the most stringent sanitary requirements for pharmaceutical and food-grade applications.
6. Precision Manufacturing: CNC-controlled forming and orbital TIG welding ensure consistent dimensional accuracy and weld quality across all production batches.
Conclusion: The Stainless Steel Coil Tube (Product No. 668) from Wenzhou Jixing Metal Materials Co., Ltd represents a high-performance engineering solution for modern material conveying systems. Its integration into disc chain conveyor technology delivers superior energy efficiency, environmental protection, and operational reliability, making it an ideal choice for demanding industrial applications across multiple sectors.