Stainless Steel Coil Tube (Coiltube) — Product Technical Specification
1. Product Overview
The Stainless Steel Coil Tube (Coiltube) is a continuous-length tubular product wound onto a coil form, manufactured by Wenzhou Jixing Metal Materials Co., Ltd. Designed for high-volume industrial distribution and downstream processing, the coil tube format eliminates the need for individual pipe cuts, reducing waste and improving material utilization rates. This product line adheres to international standards including ASTM A213, ASTM A269, EN 10216-5, and GB/T 14976, ensuring compatibility across global supply chains.
Unlike discrete-length seamless or welded tubes, coil tubes are produced in continuous runs and wound into compact coils, making them ideal for high-throughput applications in heat exchangers, chemical processing, food and pharmaceutical equipment, and automotive systems.
2. Material & Properties
Stainless steel coil tubes are fabricated from austenitic and duplex stainless steel grades selected for their superior corrosion resistance, mechanical strength, and weldability. Common grades include:
- 304 / 304L (UNS S30400 / S30403) — General-purpose grade with excellent corrosion resistance and formability
- 316 / 316L (UNS S31600 / S31603) — Enhanced chloride resistance due to molybdenum addition (2–3% Mo)
- 321 (UNS S32100) — Stabilized with titanium for high-temperature service
- 310S (UNS S31008) — High-temperature oxidation resistance up to 1150 °C
- Duplex 2205 (UNS S31803) — High yield strength (450 MPa min.) with superior chloride stress corrosion cracking resistance
Key metallurgical properties include a minimum tensile strength of 515 MPa (for 304 grade), elongation of ≥40%, and a continuous service temperature range of −196 °C to +870 °C depending on grade selection.
3. Specifications
| Parameter | Specification |
|---|---|
| Outer Diameter (OD) | 3.0 mm – 323.8 mm (⅛" – 12") |
| Wall Thickness | 0.3 mm – 12.7 mm (0.012" – 0.5") |
| Coil Inner Diameter (Coil ID) | 300 mm – 500 mm (standard); custom available |
| Coil Length per Roll | Up to 3,000 m per coil (continuous) |
| Manufacturing Method | Seamless (hot/cold drawn) or Welded (ERW / TIG) |
| Surface Finish | No. 1 (Annealed + Pickled), 2B, BA (Bright Annealed), No. 4 (Brushed), Mirror (8K) |
| Tolerance on OD | ±0.05 mm (precision); ±0.1 mm (standard) |
| Tolerance on Wall Thickness | ±10% of nominal (standard); ±5% (precision) |
| Applicable Standards | ASTM A213, ASTM A269, EN 10216-5, GB/T 14976, JIS G3459 |
| Delivery Condition | Annealed, Solution Treated, or Cold Worked |
| Coil Weight per Roll | Up to 2,500 kg (standard); up to 5,000 kg (heavy coil) |
4. Manufacturing Process
The production of stainless steel coil tubes involves a multi-stage process ensuring dimensional accuracy, metallurgical integrity, and surface quality:
- Raw Material Preparation — Hot-rolled stainless steel strip or seamless pipe blanks are inspected for chemical composition and mechanical properties.
- Forming & Welding — For welded coil tubes, the strip is rolled into a tubular shape and welded using ERW (Electric Resistance Welding) or TIG (Tungsten Inert Gas) processes. For seamless tubes, hot or cold drawing is employed.
- Heat Treatment — Annealing and solution treatment are performed to relieve internal stresses, restore ductility, and achieve the required microstructure (austenitic or duplex).
- Pickling & Descaling — Chemical pickling removes oxide scale and surface contaminants, followed by passivation to form a protective chromium oxide layer.
- Cold Sizing & Straightening — Precision cold sizing ensures dimensional tolerances; straightening eliminates coil-set and maintains tube roundness.
- Coiling & Packaging — The continuous tube is wound onto a coil reel using automated coiling equipment. A specialized coil tube packaging machine (as referenced in internal documentation regarding copper coil tube packaging systems) ensures proper bundling, moisture protection, and secure transport packaging with protective wraps and edge guards.
- Quality Inspection — Each coil undergoes ultrasonic testing (UT), hydrostatic testing, eddy current examination, and visual inspection prior to release.
5. Applications
- Heat Exchangers & Boilers — Tubular bundles for shell-and-tube heat exchangers in power generation, HVAC, and petrochemical industries
- Chemical Processing — Piping and heat transfer surfaces in aggressive chemical environments requiring corrosion resistance
- Food & Pharmaceutical Industry — Sanitary-grade tubing for CIP/SIP systems, food processing lines, and pharmaceutical equipment (316L, BA finish)
- Automotive & Aerospace — Fuel lines, exhaust systems, and structural tubing requiring high-temperature and fatigue resistance
- Oil & Gas — Downhole tubing, wellhead assemblies, and offshore platform piping
- Medical Devices — Endoscopic tubing, implantable devices, and surgical instrument shafts
6. Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system ensuring product conformity and traceability:
- ISO 9001:2015 — Quality Management System certification for manufacturing and supply chain processes
- ISO 14001:2015 — Environmental Management System
- ISO 45001:2018 — Occupational Health and Safety Management
- EN 10204 3.1 — Full inspection certificates with material traceability (mill certificates, test reports)
- CE Marking — Compliance with European pressure equipment directives (PED 2014/68/EU)
- NACE MR0175 / ISO 15156 — Compliance for sour service applications (where applicable)
- Mill Test Reports (MTR) — Provided with every shipment, including chemical analysis, mechanical test results, and dimensional verification data
7. Unique Selling Points
- Continuous Length Advantage — Eliminates weld joints in downstream processing, reducing failure points and material waste by up to 15% compared to discrete-length pipe
- Custom Coil Configuration — Tailored coil ID, coil weight, and bundling arrangements optimized for customer-specific uncoiling equipment and logistics requirements
- Integrated Packaging Solution — Proprietary coil tube packaging methodology (derived from advanced packaging machine engineering experience) ensures damage-free delivery with moisture barriers, edge protection, and secure strapping
- Full Traceability — Heat-number traceability from raw material through final product, with digital documentation available upon request
- Multi-Grade Capability — Single-source procurement for austenitic, duplex, and super-austenitic stainless steel grades, simplifying supply chain management
Note: This product is manufactured under controlled conditions with full compliance to applicable international standards. Customers are advised to specify grade, dimensions, surface finish, and applicable codes at the time of inquiry to ensure optimal product selection for their application requirements.