Stainless Steel Coil Tube (Coiltube) — Product No. 798
Product Overview
The Stainless Steel Coil Tube (Coiltube), designated as Product No. 798, is a precision-engineered continuous coil stainless steel tube manufactured by Wenzhou Jixing Metal Materials Co., Ltd. This product is designed for applications requiring flexible, corrosion-resistant tubular conduits capable of withstanding harsh environments, including marine, chemical processing, and biological treatment systems. The coil tube form factor provides superior storage efficiency, ease of deployment, and enhanced mechanical flexibility compared to straight-length tube configurations.
This product line has been validated in research contexts involving pyridinthione-based anti-fouling agents and their toxicity effects on early developmental stages of marine organisms (e.g., the Pacific coast worm, Hydroides elegans), demonstrating the tube's suitability for aquaculture and marine engineering applications where controlled chemical delivery and biofouling resistance are critical.
Material & Properties
The coil tube is fabricated from high-grade austenitic stainless steel, selected for its exceptional resistance to general corrosion, pitting, crevice corrosion, and stress corrosion cracking (SCC). The material properties are engineered to meet or exceed international standards for demanding service conditions.
- Base Alloy: Austenitic stainless steel (e.g., AISI 304, AISI 316L, or equivalent grades)
- Chromium (Cr) Content: ≥18% — provides passive oxide layer formation for corrosion resistance
- Nickel (Ni) Content: ≥8% — stabilizes the austenitic microstructure
- Molybdenum (Mo) Content: 2–3% (in 316L grade) — enhances pitting and crevice corrosion resistance
- Carbon (C) Content: ≤0.03% (L-grade) — minimizes intergranular corrosion susceptibility
- Tensile Strength: 515–750 MPa (depending on grade and cold-work condition)
- Yield Strength: 205–310 MPa
- Elongation: ≥40% (as-rolled condition)
- Operating Temperature Range: −196°C to +870°C (304 grade); −196°C to +425°C (316L grade, for sustained load)
- Surface Finish: Mill finish, electropolished, or passivated (per customer specification)
Specifications
| Parameter | Specification | Standard / Reference |
|---|---|---|
| Product Name | Stainless Steel Coil Tube (Coiltube) | — |
| Product Number | 798 | — |
| Material Grade | AISI 304 / 316L / 321 / 904L (customizable) | ASTM A269 / ASTM A213 |
| Outer Diameter (OD) | 1.5 mm – 50.8 mm (0.06" – 2.0") | ASTM A269 Table 2 |
| Wall Thickness | 0.1 mm – 3.0 mm (0.004" – 0.118") | ASTM A269 |
| Coil Length | 50 m – 3,000 m per coil (continuous) | Manufacturer specification |
| Coil Inner Diameter | 150 mm – 600 mm (adjustable) | — |
| Tolerance on OD | ±0.05 mm (thin wall); ±0.10 mm (standard wall) | ASTM A269 |
| Tolerance on Wall Thickness | ±10% (thin wall); ±12.5% (standard) | ASTM A269 |
| Form | Round, oval, rectangular, or custom cross-section | ASTM A269 / ASTM A213 |
| End Condition | Plain end, beveled, threaded, or cut-to-length | Customer specification |
| Surface Treatment | Passivated, electropolished, or acid-pickled | ASTM A967 |
| Delivery Form | Continuous coil (coiltube) on steel reel | — |
| Winding Direction | Left-hand (LH) or right-hand (RH) coil | Customer specification |
| Minimum Bend Radius | 3D (cold bending without wall reduction) | — |
Manufacturing Process
The production of the Stainless Steel Coil Tube follows a rigorous multi-stage manufacturing process to ensure dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Selection: Hot-rolled stainless steel strip or seamless pipe stock is procured from certified mills, with full chemical composition and mechanical property verification via mill test certificates (MTC).
- Strip Annealing & Pickling: Cold-rolled strip undergoes solution annealing at 1050–1150°C followed by acid pickling and passivation to restore corrosion resistance and remove oxide scale.
- Forming (Cold Rolling / Extrusion): The strip is cold-formed into the desired cross-sectional geometry (round, oval, rectangular) via precision rolling mills or extrusion dies, with tight control of dimensional tolerances.
- Welding (if applicable): For welded coil tube, a continuous TIG (Tungsten Inert Gas) welding process is employed using high-purity argon shielding gas to ensure a clean, oxide-free weld seam with minimal heat-affected zone (HAZ).
- Coil Winding: The formed tube is wound onto precision steel reels at controlled tension to maintain dimensional stability and prevent deformation or kinking.
- Heat Treatment (if required): Solution annealing at 1040–1120°C with rapid water quenching may be applied for stress relief and grain uniformity.
- Surface Finishing: Final surface treatment includes electropolishing (for Ra ≤ 0.4 μm) or acid passivation per ASTM A967 to enhance the passive chromium oxide layer.
- Quality Inspection: Each coil undergoes 100% visual inspection, dimensional verification, and sampling for hydrostatic testing, eddy current testing, and chemical analysis.
Applications
The Stainless Steel Coil Tube (Product No. 798) is engineered for a diverse range of industrial and scientific applications:
- Marine & Aquaculture Systems: Utilized in controlled-release systems for pyridinthione-based anti-fouling agents, where the tube's corrosion resistance ensures long-term integrity in saltwater environments. Research on toxicity effects to early developmental stages of marine organisms (Hydroides elegans) has validated the tube's compatibility with sensitive biological delivery systems.
- Chemical Processing: Conveyance of aggressive chemicals, acids, and alkaline solutions in pharmaceutical, petrochemical, and semiconductor manufacturing facilities.
- Food & Beverage Industry: Hygienic fluid transfer in dairy, brewing, and food processing plants (compliant with FDA and 3-A Sanitary Standards).
- Medical & Pharmaceutical: Bioreactor tubing, dialysis equipment, and medical gas delivery systems requiring biocompatibility and cleanability.
- Automotive & Aerospace: Fuel lines, exhaust systems, hydraulic circuits, and air conditioning coils requiring high-temperature and corrosion resistance.
- Heat Exchangers & Cooling Systems: Compact heat exchanger coils, refrigeration lines, and HVAC condenser/evaporator tubes.
- Environmental Engineering: Wastewater treatment systems, oil & gas separators, and environmental monitoring instrument housings.
- Scientific Research: Laboratory-scale fluid delivery systems, chromatography columns, and experimental apparatus for toxicology and ecotoxicology studies.
Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd. maintains comprehensive quality management and product certifications to ensure compliance with international standards:
- ISO 9001:2015 — Quality Management System Certification
- ISO 14001:2015 — Environmental Management System Certification
- ISO 45001:2018 — Occupational Health and Safety Management
- EN 10204 3.1 — Material Test Certificates (MTC) per product batch
- ASTM A269 / ASTM A213 — Compliance with American Society for Testing and Materials standards for stainless steel tubing
- GB/T 14976 / GB/T 12771 — Compliance with Chinese national standards for seamless and welded stainless steel tubes
- NACE MR0175 / ISO 15156 — Resistance to sulfide stress cracking (SSC) for oil & gas applications
- EU PED 2014/68/EU — Pressure Equipment Directive compliance (where applicable)
- ASME BPE — Bioprocessing Equipment standard (for pharmaceutical/medical grades)
- FDA 21 CFR 177.1550 — Food contact material compliance
- RoHS & REACH — Compliance with European hazardous substance restrictions
Unique Selling Points (USPs)
- Research-Validated Performance: The coil tube has been utilized in peer-reviewed toxicological research on pyridinthione-based anti-fouling agents, confirming its reliability in controlled chemical delivery under marine conditions.
- Continuous Coil Format: Eliminates weld seams and joint failures associated with straight-length tubing, providing superior leak integrity and mechanical continuity.
- Customizable Specifications: Full customization of dimensions, material grade, surface finish, and coil configuration to meet exact application requirements.
- Superior Corrosion Resistance: Multi-element alloy composition (Cr/Ni/Mo) ensures long service life in aggressive chemical and marine environments without degradation of mechanical properties.
- End-to-End Quality Traceability: Every coil is traceable to raw material mill certificates, with full documentation of chemical composition, mechanical testing, and dimensional verification.
- Cost-Efficient Deployment: The coil format reduces installation labor, minimizes material waste, and lowers overall system costs compared to cut-length tube assemblies.
Note: Wenzhou Jixing Metal Materials Co., Ltd. reserves the right to modify product specifications without prior notice. All dimensions and tolerances should be confirmed against the latest product data sheet and applicable engineering drawings prior to procurement. Custom specifications are available upon request through the technical sales department.