Stainless Steel Coil Tube – Precision-Formed for Industrial Applications with Actual Weighing Settlement
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. offers premium-grade Stainless Steel Coil Tubes (Coiltube), engineered to deliver superior mechanical performance, corrosion resistance, and dimensional precision across a wide range of industrial applications. Manufactured through advanced cold-drawing and coiling processes, these coil tubes are supplied in continuous lengths wound onto industrial spools, providing exceptional material utilization and minimal waste during downstream processing.
A defining feature of this product line is its commitment to fair and transparent pricing through actual weighing settlement. All coil tube orders are settled based on verified net weight measured using calibrated floor scales (weighbridges) or certified hanging scales, eliminating disputes arising from theoretical weight calculations and dimensional tolerances. This industry-leading practice ensures complete buyer confidence and cost predictability.
Material & Properties
Stainless Steel Coil Tubes are fabricated from high-quality austenitic and duplex stainless steel grades, selected to meet the demanding requirements of chemical processing, food and beverage, pharmaceutical, and energy sectors. Key material properties include:
- Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, and general oxidation in aggressive chemical environments and high-temperature atmospheres.
- Mechanical Strength: High tensile strength and yield strength with good ductility, enabling reliable performance under cyclic loading and pressure conditions.
- Hygienic Surface Finish: Available in polished, electropolished, and passivated surface finishes suitable for food-grade and pharmaceutical applications.
- Weldability: Excellent weldability with minimal distortion, supporting seamless joining in fabrication and assembly.
- Temperature Tolerance: Maintains structural integrity from cryogenic temperatures up to 870°C (1,598°F) depending on grade.
Specifications
| Parameter | Specification |
|---|---|
| Product Name | Stainless Steel Coil Tube (Coiltube) |
| Material Grades | 304, 304L, 316, 316L, 321, 310S, 904L, Duplex 2205 |
| Outer Diameter (OD) | 3.0 mm – 108.0 mm (0.12 in – 4.25 in) |
| Wall Thickness | 0.3 mm – 6.0 mm (0.012 in – 0.236 in) |
| Coil Inner Diameter | 150 mm – 600 mm (5.9 in – 23.6 in) |
| Coil Length | 2,000 mm – 12,000 mm (78.7 in – 472.4 in) per coil |
| Surface Finish | BA (Bright Annealed), Pickled & Passivated, Polished (Ra ≤ 0.4 µm), Electropolished |
| Tolerance (OD) | ±0.05 mm to ±0.15 mm (per GB/T 14976, ASTM A213) |
| Tolerance (Wall) | ±10% of nominal |
| Applicable Standards | GB/T 14976, GB/T 21832, ASTM A213, ASTM A269, EN 10217-7, JIS G3459 |
| Pricing Method | Weight-Based – Actual Weighing Settlement (Floor Scale / Hanging Scale Net Weight) |
| Packaging | Industrial coil spool with protective wrap, moisture-proof inner lining, and wooden or steel outer crate |
Manufacturing Process
The production of stainless steel coil tubes follows a rigorous, multi-stage manufacturing process designed to ensure consistent quality and dimensional accuracy:
- Raw Material Selection: Virgin stainless steel wire rod or strip from certified mills, verified through chemical composition analysis (spectrometry) and mechanical property testing.
- Hot Rolling / Cold Drawing: Seamless tubes are drawn through precision dies to achieve target outer diameter and wall thickness with tight tolerances.
- Precision Coiling: Formed tubes are wound onto controlled-radius spools using automated coiling equipment to prevent deformation, kinking, or surface damage.
- Heat Treatment: Solution annealing at 1,010°C – 1,150°C (1,850°F – 2,102°F) followed by controlled cooling to restore full austenitic microstructure and maximize corrosion resistance.
- Surface Treatment: Acid pickling and passivation to remove mill scale and form a protective chromium oxide layer; optional polishing or electropolishing for hygienic applications.
- Quality Inspection: 100% ultrasonic testing (UT) for internal defects, eddy current testing (ECT) for surface flaws, hydrostatic pressure testing, and dimensional verification.
- Net Weight Verification: Each coil is weighed on calibrated floor scales or certified hanging scales; the measured net weight is recorded and documented for settlement purposes.
- Packaging & Labeling: Coils are wrapped, labeled with full traceability data (heat number, grade, dimensions, net weight, test certificate reference), and prepared for shipment.
Applications
Stainless Steel Coil Tubes from Wenzhou Jixing are widely deployed across multiple industries:
- Food & Beverage Processing: Sanitary piping, CIP systems, brewing equipment, and dairy processing lines (grades 304L, 316L).
- Pharmaceutical Manufacturing: Clean-in-place (CIP) loops, process tubing, and hygienic transfer systems (electropolished 316L).
- Chemical Processing: Reactor tubing, heat exchangers, and corrosion-resistant piping in aggressive environments (grades 316L, 904L, Duplex 2205).
- Petroleum & Energy: Downhole tubing, oilfield equipment, and high-temperature process lines (grades 321, 310S).
- Medical Devices: Endoscopic instrument tubing and implant-grade precision coils (316LVM).
- Automotive & Aerospace: Exhaust systems, fuel lines, and high-performance structural components.
- Construction & Architecture: Decorative railings, structural supports, and architectural features.
Quality Certifications
Wenzhou Jixing Metal Materials Co., Ltd. maintains comprehensive quality management systems and certifications to ensure product conformity and buyer confidence:
- ISO 9001:2015 – Quality Management System Certification
- ISO 14001:2015 – Environmental Management System Certification
- ISO 45001:2018 – Occupational Health and Safety Management System
- EN 10204 – Third-party Inspection Certificate (3.1) available upon request
- CE Marking – Compliance with European directives for applicable products
- Mill Test Certificates (MTC): Provided with every shipment, including chemical composition, mechanical properties, and dimensional verification data
- Third-Party Testing: Available through SGS, BV, or TÜV for independent verification
Unique Selling Points
Actual Weighing Settlement – The Industry's Most Transparent Pricing Model
Unlike conventional coil tube suppliers that calculate pricing based on theoretical weight (which introduces unavoidable discrepancies due to manufacturing tolerances), Wenzhou Jixing commits to actual measured net weight settlement using calibrated floor scales or certified hanging scales. This ensures:
- Complete Fairness: Buyers pay only for the exact material delivered—no overcharging due to positive dimensional tolerances.
- Zero Disputes: Eliminates pricing conflicts that arise from theoretical vs. actual weight differences (typically 1–3% variance).
- Full Transparency: Weighing certificates are issued for every coil, providing verifiable documentation for settlement and inventory management.
- Cost Predictability: Enables precise budgeting and procurement planning for large-volume industrial buyers.
Additional Competitive Advantages:
- Wide range of grades and dimensions available from stock or custom-manufactured to specification
- Full traceability from raw material heat number through final product delivery
- Custom surface finishing options tailored to end-use requirements
- Flexible order quantities with competitive lead times
- Technical support for material selection, specification matching, and application engineering
Wenzhou Jixing Metal Materials Co., Ltd. is committed to delivering world-class stainless steel coil tube solutions backed by rigorous quality standards and a pricing philosophy built on integrity, accuracy, and mutual trust.