Stainless Steel Coil Tube — Standard-External Extra Testing & Quality Assurance Services
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. offers a comprehensive range of stainless steel coil tubes (coiltube) designed for demanding industrial applications requiring high corrosion resistance, mechanical integrity, and dimensional precision. As a specialized manufacturer and supplier, the company provides not only premium coil tube products but also a distinguished suite of standard-external extra testing services that go beyond routine quality control to deliver unmatched confidence in material performance and compliance.
These extra testing services are available as project-specific or batch-specific add-ons, allowing customers to tailor inspection protocols to their unique operational requirements, regulatory mandates, or critical-service applications. All extra testing is quoted separately per project or batch and is not included in the base product price, ensuring full transparency and cost control for the end user.
Material & Properties
Stainless steel coil tubes from Wenzhou Jixing are fabricated from a selection of austenitic, ferritic, and duplex stainless steel grades conforming to international standards including ASTM, AISI, EN, and JIS. Typical grades include:
- 304 / 304L — Excellent general corrosion resistance, formability, and weldability; ideal for food processing, chemical, and architectural applications.
- 316 / 316L — Superior chloride and pitting resistance due to molybdenum addition; preferred for marine, pharmaceutical, and aggressive chemical environments.
- 321 / 347 — Stabilized grades with titanium or niobium for resistance to intergranular corrosion at elevated temperatures.
- Duplex 2205 — High-strength, high-corrosion-resistance grade for oil & gas, offshore, and desalination applications.
- 430 / 409 — Cost-effective ferritic grades for structural and appliance applications.
Specifications
| Parameter | Specification |
|---|---|
| Product Type | Coil Tube (Coiltube) |
| Outer Diameter Range | 6.0 – 114.3 mm (0.24" – 4.5") |
| Wall Thickness Range | 0.3 – 6.0 mm (0.012" – 0.236") |
| Coil Length | Custom lengths available; typically 200 – 6000 m per coil |
| Surface Finish | 2B, BA, No. 4, No. 8, Mirror |
| Standards | ASTM A213, ASTM A269, EN 10216-5, GB/T 12771 |
| Heat Treatment | Solution annealed, pickled & passivated |
| Extra Testing (Add-On) | Third-party re-inspection, special corrosion testing, full-inspection cleanliness — quoted separately per project/batch |
Manufacturing Process
- Raw Material Selection: Only certified stainless steel strip from approved mills is used, with full chemical composition and mechanical property verification prior to processing.
- Coiling & Forming: Precision roll-forming equipment shapes the strip into seamless or welded coil tube to exact dimensional tolerances.
- Welding (where applicable): TIG welding with inert gas shielding ensures clean, defect-free weld seams.
- Heat Treatment: Solution annealing in controlled atmosphere furnaces achieves uniform microstructure and optimal corrosion resistance.
- Pickling & Passivation: Removes scale and forms a protective chromium oxide film for enhanced surface integrity.
- Dimensional Inspection: Automated gauging verifies OD, wall thickness, and roundness throughout the coil length.
- Standard Testing: Includes hydrostatic pressure testing, chemical analysis, mechanical tensile testing, and visual surface inspection.
- Coil Packaging: Tubes are wound onto protective cores, wrapped, and palletized for safe transport.
Standard-External Extra Testing Services (Unique Selling Point)
Wenzhou Jixing distinguishes itself by offering a robust suite of optional extra testing services that exceed standard industry practice. These services are tailored to project or batch requirements and are quoted separately, providing customers with complete flexibility and transparency.
- Third-Party Re-Inspection: Independent, accredited laboratories perform full verification of chemical composition, mechanical properties, dimensional accuracy, and welding quality. This provides an additional layer of assurance for critical applications where independent validation is mandated by clients, regulators, or project specifications.
- Special Corrosion Testing: Advanced corrosion evaluations including pitting resistance (PREN testing), intergranular corrosion (ASTM A262), crevice corrosion, stress corrosion cracking (SCC), and acid resistance testing. These are essential for applications in aggressive chemical environments, marine settings, or pharmaceutical processing where long-term material integrity is non-negotiable.
- Full-Inspection Cleanliness: Comprehensive cleanliness verification including surface particle analysis, residual contaminant testing, and microbiological assessment. This ensures the coil tube meets the stringent hygiene and purity requirements of food-grade, pharmaceutical, biotechnology, and semiconductor manufacturing applications.
By offering these standard-external extra testing services on a project-specific or batch-specific basis, Wenzhou Jixing empowers customers to achieve full traceability, regulatory compliance, and operational assurance without compromising cost efficiency on routine orders.
Applications
- Food & Beverage Processing: Hygienic fluid transfer, CIP systems, brewing, dairy, and juice processing equipment.
- Pharmaceutical & Biotechnology: Process piping, reactor vessels, and clean-in-place (CIP) systems requiring certified cleanliness.
- Chemical & Petrochemical: Corrosive chemical transport, heat exchangers, and process piping systems.
- Oil & Gas: Downstream processing, desalination plants, and offshore platforms (duplex grades).
- Heat Exchangers & Boilers: Tubular heat exchangers, condensers, and evaporators requiring high thermal efficiency.
- Architectural & Decoration: Handrails, structural elements, and decorative coil tube applications.
- Automotive: Exhaust systems, fuel lines, and high-temperature components.
- Power Generation: Boiler tubes, superheaters, and condenser tubes.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains rigorous quality management systems and holds the following certifications to assure customers of consistent product excellence:
- ISO 9001:2015 — Quality Management System
- ISO 14001 — Environmental Management System
- ISO 45001 — Occupational Health & Safety Management
- CE Marking — European Conformity for applicable product categories
- PED Compliance (2014/68/EU) — Pressure Equipment Directive certification for pressure-containing applications
- NACE MR0175 / ISO 15156 — Suitability for sour service environments
- Mill Test Certificates (MTC) — Full EN 10204 Type 3.1 certificates provided with every shipment
- Third-Party Inspection Support — Accepts and facilitates inspections by SGS, BV, TÜV, DNV, and other recognized organizations
Every coil tube product is accompanied by comprehensive documentation including material test certificates, heat treatment records, dimensional inspection reports, and surface finish verification. When standard-external extra testing services are engaged, additional independent test reports are provided alongside the standard documentation package.
Why Choose Wenzhou Jixing
- Flexible Extra Testing: Tailored third-party re-inspection, special corrosion testing, and full-inspection cleanliness services available on a per-project or per-batch basis — quoted transparently and separately from base pricing.
- End-to-End Traceability: Complete material traceability from mill certificate through final inspection, with digital records available upon request.
- Customization: Non-standard dimensions, surface finishes, and testing protocols can be accommodated to meet specific project requirements.
- Competitive Pricing: Base product pricing remains competitive while extra testing services are clearly itemized, enabling customers to budget precisely.
- Global Logistics: Export-oriented packaging and worldwide shipping capability serving customers across Asia, Europe, North America, and the Middle East.