Stainless Steel Coil Tube (Coiltube) – Product Technical Specification
Product Overview
The Stainless Steel Coil Tube (Coiltube) manufactured by Wenzhou Jixing Metal Materials Co., Ltd. is a continuously formed tubular product produced through advanced cold-drawing or hot-rolling processes, wound into a coil configuration for efficient storage, transportation, and downstream processing. Coil tubes offer significant advantages over cut-length pipe sections, including reduced material waste, higher production efficiency, and seamless continuity in fabrication operations. The product line encompasses a wide range of diameters, wall thicknesses, and stainless steel grades tailored to meet demanding industrial requirements.
This product has been extensively studied and validated through advanced computational simulations, including discrete element method (DEM) analysis using EDEM software, particularly in the context of vertical disc pipe scraper conveyor systems. Such research confirms the structural integrity, wear resistance, and mechanical performance of coil tubes under complex loading conditions, providing a robust engineering foundation for specification development.
Material & Properties
Stainless steel coil tubes are fabricated from austenitic, ferritic, martensitic, or duplex stainless steel grades, each selected based on the intended service environment and performance requirements.
- Austenitic Grades (304, 316, 321): Provide excellent corrosion resistance, formability, and weldability. Suitable for chemical processing, food-grade applications, and general industrial use.
- Ferritic Grades (430, 444): Offer good resistance to chloride stress corrosion cracking and thermal fatigue, with enhanced magnetic properties.
- Martensitic Grades (410, 420): Provide high strength and hardness for wear-resistant applications such as scraper conveyor components.
- Duplex Grades (2205, 2507): Combine high yield strength with superior corrosion resistance, ideal for aggressive marine and offshore environments.
Key mechanical properties include tensile strength (Tensile Strength), yield strength (Yield Strength), elongation (Elongation), hardness (Brinell/Vickers), and impact toughness (Charpy V-Notch). Surface finish options include mill finish, pickled, polished (2B, BA), and custom finishes to meet specific functional or aesthetic requirements.
Specifications
| Parameter | Specification | Standard Reference |
|---|---|---|
| Outer Diameter (OD) | 3.0 mm – 320.0 mm | ASTM A554 / ASTM A213 |
| Wall Thickness (WT) | 0.25 mm – 12.0 mm | ASME B36.19M |
| Coil Length | Up to 1,000 m per coil (continuous) | Manufacturer Specification |
| Coil Weight | Up to 5,000 kg per coil | — |
| Available Grades | 304, 304L, 316, 316L, 321, 310S, 430, 2205, 2507, 904L | ASTM / EN / JIS |
| Surface Finish | Mill Finish, 2B, BA (Bright Annealed), Polished (#4, #8, Mirror) | ASTM A478 |
| Tolerance (OD) | ±0.05 mm – ±0.50 mm (per customer requirement) | ISO 1128 |
| Tolerance (WT) | ±10% or ±0.05 mm (whichever is greater) | ASTM A554 |
| Hardness | ≤ 220 HV (annealed); up to 400 HV (solution treated) | ASTM A370 |
| Temperature Range | −196°C to +870°C (grade dependent) | ASME BPVC |
| Custom Fabrication | Available upon request (special dimensions, alloys, finishes) | — |
Manufacturing Process
The production of high-quality stainless steel coil tubes involves a series of precisely controlled manufacturing steps:
- Raw Material Selection: High-purity stainless steel strip or round bar stock is procured with certified chemical composition and mechanical properties.
- Coiling & Forming: Strip material is fed through precision rollers and formed into tubular cross-sections via continuous cold-rolling or seamless cold-drawing processes.
- Welding (where applicable): Longitudinal seams are welded using Tungsten Inert Gas (TIG) or Laser welding techniques with 100% helium leak testing or dye penetrant inspection (DPI) for seam integrity.
- Heat Treatment: Solution annealing (1050–1150°C) followed by rapid quenching ensures uniform microstructure and optimal corrosion resistance.
- Pickling & Passivation: Acid pickling removes oxide scale, followed by passivation treatment to establish a protective chromium oxide film.
- Surface Finishing: Mechanical polishing, electropolishing, or passivation is applied to achieve the specified surface finish.
- Dimensional Inspection: Automated optical measurement systems verify OD, WT, roundness, and straightness throughout the coil length.
- Coiling & Packaging: Finished tubes are wound onto precision steel cores and packaged with moisture barriers and protective wrapping.
Applications
Stainless steel coil tubes from Wenzhou Jixing Metal Materials Co., Ltd. find extensive application across multiple industrial sectors:
- Chemical & Petrochemical Industry: Process piping, heat exchangers, reactor internals, and corrosion-resistant transfer lines.
- Food & Beverage Processing: Sanitary-grade piping, CIP (Clean-In-Place) systems, and food-contact equipment components.
- Pharmaceutical Industry: GMP-compliant piping systems, bioreactor assemblies, and sterile processing equipment.
- Energy & Power Generation: Boiler tubes, condenser tubes, superheater elements, and nuclear-grade components.
- Automotive & Aerospace: Exhaust systems, fuel lines, hydraulic tubing, and structural components.
- Mechanical Conveying Systems: Vertical disc pipe scraper conveyor structures, where EDEM simulation research has validated the tube's performance under cyclic loading and abrasive wear conditions.
- Architectural & Decorative: Railings, structural framing, and high-end interior applications requiring both strength and aesthetics.
- Marine & Offshore: Seawater piping, desalination plant components, and subsea equipment housings.
Quality Certifications & Testing
Wenzhou Jixing Metal Materials Co., Ltd. maintains rigorous quality assurance protocols aligned with international standards:
- ISO 9001:2015 – Quality Management System certification ensuring consistent product quality and process control.
- ISO 14001 – Environmental Management System certification for sustainable manufacturing practices.
- EN 10204 – Type 3.1 material inspection certificates provided with each shipment.
- ASME / PED – Product compliance with European Pressure Equipment Directive (2014/68/EU) where applicable.
- NACE MR0175 / ISO 15156 – Compliance for sour service applications (hydrogen sulfide environments).
Every production batch undergoes comprehensive testing including:
- Spectroscopic chemical analysis (Optical Emission Spectroscopy – OES)
- Tensile testing per ASTM A370
- Impact testing (Charpy V-Notch) per ASTM A376
- Hydrostatic pressure testing at 1.5× working pressure
- Intergranular corrosion testing (ASTM A262 Practice E)
- Chloride stress corrosion cracking (SCC) testing
- Hardness verification (Vickers/Brinell)
- Dimensional measurement and roundness verification
- Surface roughness measurement (Ra/Rz parameters)
Unique Selling Points
- Simulation-Validated Performance: Product performance has been validated through advanced EDEM discrete element method simulations, providing quantifiable data on mechanical behavior, wear resistance, and fatigue life under real-world operating conditions.
- Continuous Length Advantage: Coil format eliminates butt-weld joints inherent in cut-length pipe, reducing potential failure points and improving overall system reliability.
- Minimal Material Waste: Continuous forming from strip reduces trim loss to less than 2%, optimizing material utilization and cost efficiency.
- Wide Grade & Dimension Range: Comprehensive product portfolio covering austenitic, ferritic, martensitic, and duplex grades in a broad spectrum of dimensions.
- Full Traceability: Each coil is serialized with complete traceability from raw material mill certificate through final inspection, ensuring supply chain accountability.
- Custom Engineering Support: Dedicated technical team provides application-specific recommendations, custom fabrication, and post-sales engineering support.
Note: All specifications are subject to revision based on customer requirements and applicable standards. Wenzhou Jixing Metal Materials Co., Ltd. reserves the right to update product specifications with prior notification. For specific project requirements, please contact our technical sales team for detailed quotation and engineering consultation.