Stainless Steel Coil Tube — EN 10204 3.2 Quality Certificate Compliance
1. Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. (温州吉兴金属材料有限公司) manufactures high-performance stainless steel coil tubes (盘管, Coil Tube) engineered to meet the most stringent international quality assurance standards. The product is designated under product sequence number 205 in the company's catalog and is specifically qualified for deployment in nuclear power (Nuclear Power Generation), offshore engineering (Offshore Engineering), and other high-safety-grade industrial projects where material traceability and third-party verification are non-negotiable contractual requirements.
The defining characteristic of this product line is its compliance with EN 10204 Type 3.2 quality certification — the highest tier of third-party witnessed material certification recognized under European and international standards. This certification builds upon the EN 10204 Type 3.1 framework by incorporating an independent third-party inspection body (Independent Third-Party Inspection) to witness and co-sign the quality documentation, thereby eliminating any potential conflict of interest between the manufacturer and the end-user.
2. Material & Properties
The stainless steel coil tube is fabricated from austenitic (Austenitic Stainless Steel) or duplex (Duplex Stainless Steel) grades conforming to applicable standards including ASTM A213, ASTM A269, GB/T 12771, and EN 10217-7. Key metallurgical properties include:
- Corrosion Resistance: Superior resistance to pitting (Pitting Corrosion), crevice corrosion (Crevice Corrosion), and stress corrosion cracking (Stress Corrosion Cracking, SCC) in chloride-containing environments.
- Mechanical Strength: Tensile strength (Tensile Strength) ranging from 520 MPa to 800 MPa depending on grade and wall thickness; elongation (Elongation) of minimum 30–40%.
- Weldability: Excellent cold and hot formability (Cold/Hot Formability) with low carbon equivalents (Carbon Equivalent, CE) ensuring reliable weld integrity (Weld Integrity) in fabrication.
- Temperature Range: Operational temperature range from cryogenic (Cryogenic, −196°C) to elevated temperatures exceeding 800°C, depending on the specific alloy grade selected.
- Non-Magnetic Properties: Fully austenitic grades exhibit non-magnetic (Non-Magnetic) behavior, critical for nuclear instrumentation and medical applications.
3. Technical Specifications
| Parameter | Specification / Standard | Notes |
|---|---|---|
| Product Type | Coil Tube (盘管) | Continuous coil form for automated processing |
| Product Sequence No. | 205 | Manufacturer catalog designation |
| Material Grades | 304, 316L, 321, 316Ti, 904L, 2205, 2507 | ASTM / EN / GB equivalents available |
| Outer Diameter (OD) | 6.35 mm – 168.3 mm (¼" – 6") | Custom sizes available upon request |
| Wall Thickness | 0.5 mm – 6.35 mm | Tolerance per ASTM A269 / EN 10217-7 |
| Surface Finish | Pickled & Passivated (P&P), Brushed, Polished | Ra ≤ 0.8 μm for polished finish |
| Coil Inner Diameter (ID) | 300 mm – 600 mm | Optimized for downstream forming equipment |
| Coil Weight | Up to 2,000 kg per coil | Customized per customer requirement |
| Heat Treatment | Solution Annealed (Solution Annealing) | 1050°C – 1150°C, water or air quenched |
| Quality Certificate | EN 10204 Type 3.2 | Third-party witnessed and co-signed |
| Traceability | Full Heat Number (Heat Number) Traceability | Each coil linked to mill certificate |
4. Manufacturing Process
The production of EN 10204 3.2 certified stainless steel coil tube follows a rigorously controlled manufacturing sequence:
- Raw Material Procurement: Cold-rolled stainless steel strip (Cold-Rolled Strip) sourced from certified mills with full heat analysis (Heat Analysis) documentation and mill test reports (Mill Test Reports, MTR) conforming to ASTM A240 or EN 10088-2.
- Incoming Inspection: Dimensional verification (Dimensional Verification), chemical composition analysis (Chemical Composition Analysis, CCA), and mechanical property testing (Mechanical Property Testing) performed prior to processing. Third-party inspectors are present for critical inspection points.
- Coil Forming / Roll Forming: Precision roll-forming (Roll Forming) or tube-rolling (Tube Rolling) processes convert flat strip into continuous tube with tight dimensional tolerances (Dimensional Tolerances). The process ensures uniform wall thickness (Wall Thickness Uniformity) and consistent cross-sectional geometry.
- Welding (if applicable): For welded coil tube configurations, TIG welding (Tungsten Inert Gas Welding, GTAW) or laser welding (Laser Welding) is employed with argon shielding (Argon Shielding) to prevent oxidation (Oxidation) and maintain metallurgical integrity.
- Heat Treatment: Solution annealing (Solution Annealing) at controlled temperatures followed by rapid quenching (Rapid Quenching) to achieve the desired microstructure (Microstructure) and maximize corrosion resistance.
- Pickling & Passivation: Acid pickling (Acid Pickling) removes oxide scale (Oxide Scale); passivation (Passivation) treatment establishes a protective chromium oxide film (Chromium Oxide Film) for enhanced corrosion resistance.
- Final Inspection & Certification: Comprehensive final testing including hydrostatic pressure testing (Hydrostatic Pressure Testing), dimensional inspection, surface quality assessment, and non-destructive testing (Non-Destructive Testing, NDT) such as ultrasonic testing (Ultrasonic Testing, UT) and eddy current testing (Eddy Current Testing, ECT). An independent third-party certification body (Independent Third-Party Certification Body) witnesses and co-signs the final quality documentation.
5. Applications
The EN 10204 3.2 certified stainless steel coil tube is specifically engineered for applications where material integrity failure is unacceptable:
- Nuclear Power Industry (Nuclear Power Industry): Coolant piping (Coolant Piping), containment system tubing (Containment System Tubing), and instrumentation lines (Instrumentation Lines) in pressurized (Pressurized) and boiling water reactors (Boiling Water Reactors, BWR). Compliance with regulatory frameworks including NQA-1 (National Quality Assurance, NQA-1) and RCC-M.
- Offshore & Marine Engineering (Offshore & Marine Engineering): Subsea production tubing (Subsea Production Tubing), umbilical components (Umbilical Components), and offshore platform piping systems (Offshore Platform Piping Systems) exposed to seawater corrosion (Seawater Corrosion) and extreme pressure (Extreme Pressure).
- Petrochemical & Refining (Petrochemical & Refining): Heat exchanger tubing (Heat Exchanger Tubing), distillation column internals (Distillation Column Internals), and process piping (Process Piping) handling aggressive chemicals (Aggressive Chemicals).
- Pharmaceutical & Food Processing (Pharmaceutical & Food Processing): Sanitary-grade tubing (Sanitary-Grade Tubing) requiring CIP (Clean-In-Place) compatibility and biocompatibility (Biocompatibility).
- Aerospace & Defense (Aerospace & Defense): Hydraulic lines (Hydraulic Lines), fuel system tubing (Fuel System Tubing), and structural components (Structural Components) demanding full traceability (Full Traceability) and certified material properties.
- Medical Devices (Medical Devices): Endoscopic tubing (Endoscopic Tubing), implantable components (Implantable Components), and surgical instrument tubing (Surgical Instrument Tubing) requiring biocompatible (Biocompatible) certified materials.
6. Quality Certifications — EN 10204 Type 3.2
The EN 10204 Type 3.2 Certificate (European Standard 10204, Type 3.2) represents the highest level of third-party witnessed material certification within the EN 10204 framework. The following describes the certification hierarchy and the specific value added by Type 3.2:
| Certificate Type | Description | Third-Party Involvement |
|---|---|---|
| EN 10204 Type 2.1 | Supplier's Test Report (Supplier's Test Report) | None — self-declared by manufacturer |
| EN 10204 Type 2.2 | Supplier's Test Report with certified results (Supplier's Test Report with Certified Results) | Partial — specific results certified by third party |
| EN 10204 Type 3.1 | Supplier's Declaration of Compliance with independent test report (Supplier's Declaration of Compliance with Independent Test Report) | Limited — independent testing of specific items |
| EN 10204 Type 3.2 | Supplier's Declaration of Compliance with independent test report and independent witness signature (Supplier's Declaration of Compliance with Independent Test Report and Independent Witness Signature) | Full — independent third party witnesses all critical inspection points and co-signs the certificate |
Key Differentiators of EN 10204 Type 3.2
- Independent Third-Party Witness Signature (Independent Third-Party Witness Signature): An accredited independent inspection body (Accredited Independent Inspection Body) — such as Bureau Veritas, SGS, DNV, Lloyd's Register, or TÜV — physically witnesses critical manufacturing and testing stages and applies its official signature and seal to the quality documentation. This provides the end-user with an unambiguous guarantee that the material meets specified requirements without reliance solely on the manufacturer's self-declaration.
- Full Chain of Custody (Full Chain of Custody): From raw material mill certification through every processing step to final delivery, the material's identity and properties are continuously verified and documented.
- Regulatory Compliance (Regulatory Compliance): EN 10204 Type 3.2 satisfies mandatory documentation requirements imposed by nuclear regulatory bodies (Nuclear Regulatory Bodies), including the U.S. Nuclear Regulatory Commission (U.S. Nuclear Regulatory Commission, NRC), the UK's Office for Nuclear Regulation (Office for Nuclear Regulation, ONR), and equivalent international authorities.
- Contractual Assurance (Contractual Assurance): For high-value procurement contracts (High-Value Procurement Contracts) in the offshore, petrochemical, and defense sectors, EN 10204 Type 3.2 is frequently stipulated as a non-negotiable deliverable in contract terms (Contract Terms) and quality warranty documentation (Quality Warranty Documentation).
Unique Selling Point: Wenzhou Jixing Metal Materials Co., Ltd. is among the select number of Chinese manufacturers capable of delivering EN 10204 Type 3.2 certified stainless steel coil tube with full independent third-party witness signature. This capability positions the company as a qualified supplier for the most demanding global industrial projects, providing end-users with the material confidence, regulatory compliance, and contractual assurance required for critical infrastructure applications.
Associated Standards & References
- EN 10204 — Metallic products — Types of documentation on quality (金属产品 — 质量文件类型)
- ASTM A213 — Standard Specification for Seamless Austenitic Stainless Steel Tubes for High-Pressure Boilers and Similar Applications
- ASTM A269 — Standard Specification for Seamless and Welded Austenitic Stainless Steel Pipe, Tube, and Bar Stock for Chemical and Heat-Transfer Applications
- EN 10217-7 — Non-alloy and alloy steel tubes for mechanical and technical uses — Technical delivery conditions — Seamless and welded tubes of austenitic and austenitic-ferritic steels
- NQA-1 — Quality Assurance Requirements for Nuclear Power Plants (美国核电厂质量保证要求)
- RCC-M — French Rules for the Design and Fabrication of Mechanical Components of Nuclear Power Plant Reactor Systems