Stainless Steel Coil Tube with Full Radiographic Testing (RT) Quality Assurance
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. presents a premium-grade stainless steel coil tube (盘管) engineered for demanding industrial applications requiring superior structural integrity and weld quality. This coil tube product is distinguished by its comprehensive non-destructive testing (NDT) protocol, specifically incorporating X-ray and gamma-ray radiographic imaging—both film-based and digital—to ensure the highest level of defect detection throughout the entire manufacturing and inspection cycle.
Designed for applications where volumetric defect sensitivity is critical, this coil tube undergoes rigorous radiographic examination that achieves exceptionally high detection rates for internal defects such as porosity, slag inclusions, and other volume-type discontinuities. The result is a product that meets the most stringent weld quality arbitration standards in the industry.
Material & Properties
- Material Grades: 304, 304L, 316, 316L, 321, 310S, and other standard austenitic stainless steel grades
- Corrosion Resistance: Excellent resistance to general corrosion, pitting, and stress corrosion cracking
- Mechanical Properties: High tensile strength with maintained ductility across a wide temperature range
- Hygienic Surface Finish: Available in polished, electropolished, and sanitary-grade surface finishes (Ra ≤ 0.4 μm available)
- Temperature Range: Suitable for cryogenic to high-temperature service conditions
Specifications
| Parameter | Specification |
|---|---|
| Product Form | Coil Tube (Continuous Length) |
| Material Grades | SUS304, 304L, 316, 316L, 321, 310S, Custom |
| Outer Diameter | Φ3.0 mm – Φ114.3 mm |
| Wall Thickness | 0.3 mm – 6.0 mm |
| Coil Length | Custom (Standard: 50m – 200m per coil) |
| Surface Finish | Pickled & Passivated, Polished, Electropolished |
| Manufacturing Method | Seamless / Welded (per customer requirement) |
| Applicable Standards | ASTM A213/A269, ASME SA-213/SA-269, EN 10217, GB/T 12771 |
| NDT Method | X-Ray / Gamma-Ray Radiographic Testing (Film & Digital Imaging) |
| NDT Coverage | 100% Volumetric Inspection on Welded Products |
Manufacturing Process
Production Workflow
- Raw Material Selection: Sourcing certified stainless steel strip or billet from accredited mills with full chemical and mechanical traceability.
- Forming & Welding: Precision coil forming using automated roll-forming equipment; TIG welding for welded products with controlled heat input to minimize distortion.
- Heat Treatment: Solution annealing (1050°C – 1150°C) followed by controlled cooling to restore full austenitic microstructure and maximize corrosion resistance.
- Surface Processing: Pickling and passivation to remove scale and restore chromium oxide protective layer.
- Dimensional Inspection: Online measurement of OD, wall thickness, and coil geometry to ensure conformance to specifications.
- Radiographic Testing (RT): Full volumetric inspection using X-ray or gamma-ray sources with either film-based or digital imaging detection systems.
- Final Packaging: Protective end caps, moisture-absorbent packaging, and secure coil bundling for transport.
Radiographic Testing (RT) — Key Quality Assurance Differentiator
Wenzhou Jixing Metal Materials Co., Ltd. employs X-ray and gamma-ray radiographic imaging as a core quality assurance measure for all coil tube products. This advanced NDT methodology provides:
- Exceptionally High Detection Rate for Volumetric Defects: Porosity, slag inclusions, and other volume-type discontinuities are identified with superior sensitivity compared to surface-only inspection methods.
- Authoritative Weld Quality Arbitration: RT serves as the definitive arbitration method for weld quality disputes, providing permanent, reviewable documentation of internal joint integrity.
- Dual Modality Capability: Both conventional film-based radiography and modern digital radiography (DR) / computed radiography (CR) systems are deployed, offering flexibility in image resolution and turnaround time.
- Comprehensive Coverage: Inspection can be performed on 100% of weld seams or at statistically validated sampling rates per project requirements.
While radiographic testing represents a higher cost and longer inspection cycle compared to faster methods such as eddy current or ultrasonic testing, Wenzhou Jixing Metal Materials Co., Ltd. considers this investment essential to guaranteeing zero-defect delivery for critical applications where weld integrity is non-negotiable.
Applications
- Heat Exchanger Coils: Condensers, evaporators, and refrigeration coils requiring proven weld integrity under thermal cycling.
- Pharmaceutical & Food Processing: Sanitary-grade coil tubing for CIP/SIP processes where internal surface quality and defect-free welds are mandatory.
- Chemical Processing: Corrosive media transfer lines, reactor internals, and mixing systems.
- Automotive Industry: Turbocharger exhaust manifolds, fuel system lines, and high-temperature applications.
- Medical Equipment: Endoscope tubing, implant-grade coil assemblies, and diagnostic equipment components.
- Energy & Power Generation: Boiler tubes, solar thermal collectors, and nuclear-grade applications.
- Oil & Gas: Subsea connections, wellhead components, and corrosion-resistant flow lines.
Quality Certifications
- ISO 9001:2015 — Quality Management System Certification
- ISO 3834 — Welding Quality Requirements Compliance
- EN 10204 — Type 3.1 Inspection Certificates (Third-Party Verified)
- ASME Section IX — Welding Procedure Qualification
- ASNT Level III — Certified NDT Personnel for Radiographic Testing
- ISO 17635 / EN ISO 17635 — NDT Procedure and Personnel Qualification Standards
- Mill Test Reports (MTR) — Full chemical composition and mechanical property documentation for every heat
Unique Selling Points
- 100% Radiographic Inspection Option: Industry-leading commitment to volumetric defect detection ensures no hidden internal flaws reach the customer.
- Digital & Film RT Flexibility: Customers benefit from both high-resolution film radiography and rapid digital imaging, depending on project timelines and resolution requirements.
- Weld Quality Arbitration Authority: RT documentation provides irrefutable evidence of joint integrity, resolving quality disputes definitively.
- Full Traceability: From raw material mill certificates through final RT reports, every coil is fully traceable.
- Custom Coil Geometry: Flexible coil lengths, diameters, and configurations tailored to customer equipment specifications.
- Multi-Grade Capability: One-source supply across multiple stainless steel grades simplifies procurement and ensures consistent quality standards.