Ultra-High Purity Stainless Steel Coil Tube — Helium Leak Detection Verified
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. presents its premium-grade stainless steel coil tube (product reference No. 227), engineered specifically for high-purity piping systems and vacuum applications where absolute leak integrity is non-negotiable. Each coil tube is manufactured to exacting tolerances and subjected to rigorous leak detection protocols—including helium mass spectrometry and bubble testing—to guarantee leak-tight performance at sensitivities as low as 10⁻⁹ mbar·L/s. This product is the industry benchmark for applications demanding sustained vacuum integrity, chemical purity, and long-term reliability.
Material & Properties
The coil tube is fabricated from high-grade austenitic stainless steel, selected for its superior corrosion resistance, mechanical strength, and compatibility with ultra-high purity environments. Key material properties include:
- Corrosion Resistance: Excellent resistance to pitting, crevice corrosion, and stress-corrosion cracking in aggressive chemical and high-temperature environments.
- Mechanical Integrity: High tensile strength and elongation ensure dimensional stability under vacuum and pressure cycling.
- Surface Finish: Electro-polished or mechanical polished interior surfaces with Ra ≤ 0.25 µm to minimize particulate generation and facilitate cleaning.
- Low Outgassing: Suitable for vacuum system service with minimal gas evolution, preserving system base pressure.
- Weldability: Compatible with orbital TIG welding and brazing for seamless, leak-free system integration.
Specifications
| Parameter | Specification |
|---|---|
| Product Category | Installation & Maintenance — Leak Detection Verified Coil Tube |
| Product Reference No. | 227 |
| Material Grade | 304L / 316L / 316L Mo (available on request) |
| Tube Configuration | Coiled (continuous spool) |
| Leak Detection Method | Helium Mass Spectrometry / Bubble Method |
| Leak Detection Sensitivity | 10⁻⁹ mbar·L/s |
| Interior Surface Finish | Electro-polished, Ra ≤ 0.25 µm |
| Applicable Vacuum Range | Ultra-High Vacuum (UHV) compatible |
| Verification Frequency | Periodic validation for high-purity piping & vacuum systems |
| Coil Diameter | Customizable per customer requirement |
| Wall Thickness | Customizable per customer requirement |
Manufacturing Process
Every coil tube produced by Wenzhou Jixing Metal Materials Co., Ltd. undergoes a multi-stage manufacturing and verification process designed to eliminate any possibility of hidden leakage:
- Material Selection & Incoming Inspection: Only certified, low-carbon austenitic stainless steel coils are accepted, with full mill test reports (MTRs) verified for chemical composition and mechanical properties.
- Precision Forming: Tubes are cold-formed or seamless-drawn to exact dimensional tolerances, ensuring uniform wall thickness and consistent internal geometry throughout the coil length.
- Surface Treatment: Interior surfaces undergo electro-polishing or mechanical polishing to achieve ultra-smooth finishes, reducing surface area and eliminating crevices where contaminants or micro-leaks could accumulate.
- Helium Mass Spectrometry Leak Testing: Each coil tube is sealed into a test fixture and subjected to helium sniffing or flow testing using a calibrated mass spectrometer. The detection threshold of 10⁻⁹ mbar·L/s ensures that even the most minute pinhole leaks—imperceptible to conventional methods—are identified and rectified before shipment.
- Bubble Method Verification: As a complementary verification step, critical sections are subjected to bubble testing under controlled pressure differentials, providing visual confirmation of leak-free integrity at weld joints, thread connections, and end seals.
- Final Cleaning & Packaging: Tubes are acid-pickled, passivated, and cleaned to remove all processing residues. They are then packaged in protective, moisture-controlled packaging to preserve surface integrity until installation.
Applications
The helium-leak-detected stainless steel coil tube is the preferred choice for demanding applications where system integrity and purity are paramount:
- Semiconductor Manufacturing: High-purity gas delivery lines, process gas manifolds, and vacuum chamber interconnects where particle and contamination control is critical.
- Pharmaceutical & Biotechnology: Sterile fluid transfer systems, CIP/SIP piping loops, and cleanroom process connections requiring validated leak-tight performance.
- Vacuum Engineering: UHV systems, particle accelerator beam lines, cryogenic applications, and scientific instrumentation requiring sustained base pressures below 10⁻⁹ mbar.
- Food & Beverage Processing: Sanitary-grade piping systems where product purity and hygiene compliance are regulated.
- Chemical & Petrochemical Industry: Corrosive fluid handling, high-pressure process loops, and safety-critical installations requiring periodic leak verification.
- Energy & Power Generation: Steam systems, condensate return lines, and nuclear-grade piping where leak integrity is a safety imperative.
Quality Certifications & Compliance
Wenzhou Jixing Metal Materials Co., Ltd. maintains a comprehensive quality management system aligned with international standards, ensuring every coil tube meets the most stringent performance requirements:
- ISO 9001:2015 — Quality Management System certification ensuring consistent product quality and process control.
- ISO 14001:2015 — Environmental Management System compliance for sustainable manufacturing practices.
- ASME B31.3 — Process piping design and construction standards for chemical, petroleum, and pharmaceutical service.
- ASTM A269 / A270 — Seamless and welded austenitic stainless steel tubing standards.
- EN 10217-7 — European standard for heat-resistant, high-temperature stainless steel tubes.
- ASME BPE — Bioprocessing Equipment standard for pharmaceutical-grade tubing surface quality and hygiene design.
Key Selling Point: The integration of helium mass spectrometry leak detection at a sensitivity of 10⁻⁹ mbar·L/s sets this product apart from conventional coil tubes. This level of verification—combined with bubble method confirmation—provides absolute assurance that the product is leak-free upon delivery, eliminating the risk of costly system failures, contamination events, or safety incidents in critical applications. Wenzhou Jixing Metal Materials Co., Ltd. is the trusted supplier for high-purity and vacuum system coil tubes where zero-leak performance is not optional—it is mandatory.