Stainless Steel Coil Tube — EN 10204 3.2 Quality Certification Specification

Product Overview

Wenzhou Jixing Metal Materials Co., Ltd. (Wenzhou Jixing) manufactures premium-grade stainless steel coil tubes (盘管 / Coiltube) designed for the most demanding industrial applications. This product is supplied with an EN 10204 Type 3.2 Certificate of Compliance, representing the highest tier of third-party verified quality documentation recognized under European Standard EN 10204 and its international equivalent ISO 3760. The 3.2 certification mandates not only comprehensive material test reports and manufacturing traceability (as required by Type 3.1) but also the mandatory witnessing and independent signature of a recognized third-party inspection body throughout the entire production cycle.

Key Distinction: The EN 10204 Type 3.2 certificate builds upon the Type 3.1 requirements by adding independent third-party witness signature at critical production stages, providing an additional layer of assurance that material properties, dimensional accuracy, and compliance with specified standards are independently verified by an accredited inspection authority.

Material & Properties

Stainless steel coil tubes produced by Wenzhou Jixing are available in a range of austenitic, ferritic, and duplex stainless steel grades, including but not limited to:

Typical mechanical and physical properties for common grades are as follows:

Property 304 / 304L 316 / 316L 2205 Duplex 2507 Super Duplex
Tensile Strength (Rm) [MPa] ≥ 515 ≥ 515 ≥ 550 ≥ 620
Yield Strength (Rp0.2) [MPa] ≥ 205 ≥ 205 ≥ 450 ≥ 550
Elongation (A50) [%] ≥ 40 ≥ 40 ≥ 25 ≥ 15
Corrosion Resistance (pH) Good Excellent (Cl⁻ resistant) Outstanding Superior (high Cl⁻)
Maximum Service Temperature [°C] 870 870 350 300
Equivalent NACE MR0175 / ISO 15156 — — Yes Yes

Specifications

Parameter Specification / Range Standard Reference
Outer Diameter (OD) 6.0 mm – 300.0 mm ASTM A213 / EN 10216-5
Wall Thickness (WT) 0.5 mm – 12.0 mm ASTM A213 / EN 10216-5
Coil Length 10 m – 500 m (customizable) Manufacturer specification
OD Tolerance ±0.15 mm (≤50 mm OD); ±0.25 mm (>50 mm OD) EN 10216-5
Wall Thickness Tolerance ±10% (or ±0.1 mm, whichever is greater) EN 10216-5
Straightness ≤ 0.15% of coil length ASTM A213
Surface Finish 2B / BA / Pickled & Passivated / Custom ASTM A480
End Form Plain / Beveled / Threaded ASME B1.20.1 / ASME B1.20.2
Heat Treatment Solution Annealed (1050–1150°C) + Water Quenched ASTM A213
Applicable Standards ASTM A213, ASTM A269, EN 10216-5, EN 10217-7, GB/T 12771 —
Quality Certificate EN 10204 Type 3.2 (with ISO 3760 equivalence) EN 10204 / ISO 3760

Manufacturing Process

The production of EN 10204 3.2 certified stainless steel coil tubes at Wenzhou Jixing follows a rigorously controlled multi-stage manufacturing process with independent third-party inspection at each critical stage:

  1. Raw Material Selection & Verification: Only certified stainless steel seamless or welded pipe blanks from approved mills are sourced. Incoming materials undergo full chemical composition analysis (ICP-OES / Spark OES) and mechanical property verification. Third-party witness: Yes
  2. Heat Treatment (Solution Annealing): Tubes are solution annealed at 1050–1150°C followed by rapid water quenching to achieve a fully austenitic (or duplex) microstructure with optimal corrosion resistance and mechanical properties. Third-party witness: Yes (temperature curve verification)
  3. Pickling & Passivation: Surface oxide scale is removed via acid pickling, followed by passivation treatment to restore chromium oxide protective layer. Third-party witness: Yes
  4. Dimensional Forming & Coiling: Tubes are cold-formed to precise OD and WT specifications, then coiled to required lengths using computer-controlled coiling equipment. Third-party witness: Yes (dimensional measurements)
  5. Non-Destructive Testing (NDT): 100% inline ultrasonic testing (UT) and eddy current testing (ECT) are performed to detect internal and surface defects. Positive material identification (PMI) via XRF is conducted on each heat. Third-party witness: Yes
  6. Final Mechanical & Chemical Testing: Tensile testing, hardness testing, impact testing (where applicable), and full chemical analysis are performed per ASTM E8 / ASTM E10 / ASTM E415. Third-party witness: Yes (test witnessing)
  7. Final Inspection & Certification: A recognized third-party inspection body (e.g., Bureau Veritas, SGS, DNV, Lloyd's Register) conducts final product inspection and issues the EN 10204 Type 3.2 certificate with independent signature. Third-party witness: Yes (final sign-off)

Applications

The EN 10204 Type 3.2 certification is specifically required for high-safety-level projects where material integrity and traceability are critical to public safety and regulatory compliance. Primary application sectors include:

Quality Certifications

EN 10204 Type 3.2 Certificate — Detailed Requirements

The EN 10204 Type 3.2 certificate (equivalent to ISO 3760 Type 3.2) represents the most stringent quality documentation tier available under European product certification standards. The following table summarizes the certification hierarchy and the specific requirements of Type 3.2:

Certificate Type Description Third-Party Witness Applicable Projects
EN 10204 2.1 Mill test certificate (MTC) — general declaration of conformity No Standard commercial applications
EN 10204 2.2 Test report — individual test results per heat/lot No General industrial applications
EN 10204 3.1 Test report with specific test results per EN 10204 Annex A (mechanical, chemical, dimensional, NDT) No Enhanced industrial applications
EN 10204 3.2 3.1 requirements + independent third-party inspection body witness signature at critical production stages Yes (Mandatory) Nuclear, Marine, Offshore, High-safety projects

What the 3.2 Certificate Includes

Accredited Third-Party Inspection Bodies

Wenzhou Jixing engages internationally recognized inspection and certification bodies for EN 10204 3.2 witnessing and certification, including:

Unique Selling Points