Ultra-Pure Stainless Steel Coil Tube for Semiconductor & High-Purity Chemical Applications
Product Overview
Wenzhou Jixing Metal Materials Co., Ltd. offers premium-grade Ultra-Pure Stainless Steel Coil Tubes engineered specifically for semiconductor fabrication, photovoltaic manufacturing, pharmaceutical processing, and other applications demanding the highest levels of chemical purity. These precision-formed coil tubes are manufactured and inspected to meet stringent cleanliness specifications, with ionic contamination controlled at the parts-per-billion (ppb) level through advanced Ion Chromatography (IC) analysis.
Unlike conventional stainless steel tubing, these coil tubes are designed to prevent metallic ion leaching and surface contamination, ensuring that critical process fluids—such as ultrapure water (UPW), electronic-grade chemicals, and specialty gases—remain uncontaminated throughout their delivery pathways. This makes them indispensable components in wafer processing lines, chemical mechanical planarization (CMP) systems, and high-purity fluid transfer systems.
Material & Properties
Base Material Grades
- 316L (UNS S31603) — Primary grade for chemical and semiconductor applications; offers superior corrosion resistance due to molybdenum addition (2.0–3.0%)
- 304L (UNS S30403) — General-purpose ultra-pure grade with excellent formability and weldability
- 904L (UNS N08904) — For highly aggressive chemical environments requiring maximum resistance to reducing acids
- 304L/316L Low-Carbon Variants — Specifically refined for minimum carbon content (≤0.03%) to prevent sensitization and intergranular corrosion
Key Material Properties
- Ultra-low carbon content: Carbon ≤ 0.030% to minimize chromium carbide precipitation
- Surface finish: Electropolished to Ra ≤ 0.25 μm (10 μin) for reduced particle generation and easy cleaning
- Surface passivation: Nitric acid or citric acid passivation to establish a stable chromium oxide film
- Low impurity levels: Residual sulfur, phosphorus, and nitrogen controlled to minimum thresholds
- Non-magnetic properties: Inherent austenitic structure ensures non-magnetic behavior
Specifications
| Parameter | Specification | Test Method |
|---|---|---|
| Outer Diameter (OD) | 1.5 mm – 168.3 mm (0.059" – 6.625") | Dimensional inspection |
| Wall Thickness | 0.25 mm – 6.35 mm (0.010" – 0.250") | Ultrasonic / wall gage |
| Coil Length | Custom (typically 5 m – 50 m per coil) | Measuring wheel |
| Surface Roughness (Ra) | ≤ 0.25 μm (≤ 10 μin) | Optical profilometry |
| Na⁺ (Sodium) Limit | ≤ 1 ppb (1 μg/L) | Ion Chromatography (IC) |
| K⁺ (Potassium) Limit | ≤ 1 ppb (1 μg/L) | Ion Chromatography (IC) |
| Cl⁻ (Chloride) Limit | ≤ 1 ppb (1 μg/L) | Ion Chromatography (IC) |
| SO₄²⁻ (Sulfate) Limit | ≤ 1 ppb (1 μg/L) | Ion Chromatography (IC) |
| Fe²⁺ (Ferrous Iron) Limit | ≤ 1 ppb (1 μg/L) | ICP-MS / IC |
| Cr³⁺ (Chromium) Limit | ≤ 1 ppb (1 μg/L) | ICP-MS / IC |
| Mo⁶⁺ (Molybdenum) Limit | ≤ 1 ppb (1 μg/L) | ICP-MS / IC |
| Pressure Rating | Up to 30 MPa (4,351 psi) depending on OD/WT | Hydrostatic test |
| Temperature Range | −196 °C to +450 °C (−321 °F to +842 °F) | — |
| Standards Compliance | ASTM A269, ASTM A213, EN 10216-5, SEMI F57 | Full material certification |
| Welding | Orbital TIG welds (fully radiographed on request) | Radiographic / dye penetrant |
Manufacturing Process
Step-by-Step Production Sequence
- Material Selection & Ingot Refining: Starting from vacuum arc remelted (VAR) or electron beam melted (EBM) ingots to ensure uniform microstructure and minimal inclusion content.
- Hot Rolling & Annealing: Billet is hot-rolled into seamless tube blank, followed by solution annealing at 1,050–1,100 °C to homogenize the austenitic matrix.
- Cold Drawing & Sizing: Multi-pass cold drawing through precision dies to achieve tight dimensional tolerances (±0.05 mm on OD) and enhanced mechanical properties.
- Pickling & Passivation: Immersion in a controlled nitric/hydrofluoric acid blend to remove surface oxides and establish a uniform chromium-rich passive film. Followed by deionized water rinsing to 18.2 MΩ·cm conductivity.
- Electropolishing (EP): Internal and external surfaces are electropolished to achieve Ra ≤ 0.25 μm finish, removing micro-pitting, embedded particles, and surface irregularities that could serve as contamination sources.
- Coiling & Strapping: Precision coiling on calibrated mandrels to ensure uniform curvature without introducing cold-work or surface damage. Strapped and protected for transport.
- Final Cleaning & Packaging: Tubes are cleaned with HPLC-grade solvents, dried with filtered nitrogen, and packaged in VCI-lined protective sleeves or vacuum-sealed containers to maintain cleanliness prior to shipment.
Applications
Semiconductor & Electronics
- Ultrapure water (UPW) distribution systems in wafer fabrication facilities
- Electronic-grade chemical delivery lines (HF, HCl, H₂SO₄, HNO₃, H₂O₂, BHF)
- CMP slurry transport and recirculation loops
- Specialty gas (SF₆, NF₃, Cl₂, HBr) manifold and delivery tubing
- Wet bench and cleaning tool fluid circuits
Pharmaceutical & Biotechnology
- WFI (Water for Injection) and purified water piping systems
- CIP/SIP (Clean-in-Place / Sterilize-in-Place) process loops
- Bio-reactor and fermentation equipment fluid transfer
- Biopharmaceutical manufacturing process lines
Other High-Purity Applications
- Photovoltaic (solar cell) manufacturing chemical lines
- Lithium-ion battery precursor processing
- Food-grade and beverage processing (sanitary tubing)
- Research and analytical instrumentation (HPLC, ICP-MS, GC)
- Aerospace and defense fluid systems requiring contamination control
Quality Certifications & Testing Protocols
Industry Certifications
- ISO 9001:2015 — Quality Management System certification
- ISO 14001:2015 — Environmental Management System
- SEMI F57 — Cleanliness specification for semiconductor-grade stainless steel tubing
- SEMI S2 / S8 — Safety standards for semiconductor equipment materials
- EN 10204 3.1 — Third-party material test certification
- ASME BPE — Bioprocessing equipment compliance (for pharma-grade variants)
Inspection & Testing Methods
| Test Category | Method | Frequency |
|---|---|---|
| Chemical Composition | OES (Optical Emission Spectroscopy) / Spark Spectrometer | Every heat lot |
| Dimensional Verification | CMM / Laser micrometer / Wall thickness gage | Every coil |
| Surface Roughness | Optical surface profilometer (laser confocal) | Every coil (sampled) |
| Ion Contamination (Anions & Cations) | Ion Chromatography (IC) — Na⁺, K⁺, Cl⁻, SO₄²⁻ at ppb level | Every coil (certified) |
| Heavy Metal Leaching | ICP-MS (Inductively Coupled Plasma Mass Spectrometry) | Per customer requirement |
| Hydrostatic Pressure Test | 1.5× working pressure, 30-second hold | Every coil |
| Visual & Surface Inspection | 10× magnification / borescope (internal) | Every coil |
| Weld Integrity (if applicable) | Radiographic testing (RT) / Dye penetrant (PT) | Every weld joint |
Ion Chromatography (IC) Cleanliness Verification
All coil tubes are subjected to rigorous Ion Chromatography (IC) analysis prior to shipment. Deionized water (18.2 MΩ·cm) is circulated through a representative sample of each coil at controlled temperature and flow rate. The effluent is analyzed for individual cation and anion species:
- Cations: Na⁺, K⁺, Ca²⁺, Mg²⁺, Fe²⁺, Cr³⁺, Ni²⁺, Mo⁶⁺
- Anions: Cl⁻, SO₄²⁻, NO₃⁻, NO₂⁻, F⁻, PO₄³⁻
Acceptance criteria require all measured ionic species to be at or below 1 ppb (1 μg/L), ensuring that the tubing will not introduce metallic or anionic contamination into the process fluid stream. This level of purity control is critical for preventing wafer defects, product rejection, and yield loss in semiconductor and pharmaceutical manufacturing.
Unique Selling Points
- PPB-Level Ionic Purity Guarantee: Every coil is certified with individual IC test reports demonstrating Na⁺, K⁺, Cl⁻, and SO₄²⁻ levels at or below 1 ppb—exceeding SEMI F57 requirements.
- Wafer-Safe Design: Formulated and processed to eliminate metallic ion leaching that causes particle contamination and electrical defects on semiconductor wafers.
- Coil Form Advantage: Delivered in continuous coil configuration for easy on-site forming, bending, and fabrication—reducing field welding requirements and minimizing contamination risk from additional joints.
- Full Traceability: Each coil is heat-number traced with complete mill test reports, IC analysis data, and dimensional certificates available upon request.
- Custom Specifications: Tailored OD, wall thickness, coil length, surface finish, and passivation chemistry to match specific customer system requirements.
- Competitive Sourcing: Direct manufacturing from Wenzhou, China's premier stainless steel processing hub, providing competitive pricing without compromising on ultra-purity standards.
Technical Support & Ordering
Wenzhou Jixing Metal Materials Co., Ltd. provides comprehensive technical support including:
- Material selection guidance based on process fluid chemistry
- System design consultation for fluid transfer applications
- Custom IC testing protocols tailored to specific customer specifications
- Sample coils for customer qualification and validation testing
- On-site application engineering support for complex installations
For detailed specifications, sample requests, or quotation inquiries, contact Wenzhou Jixing Metal Materials Co., Ltd. with your specific application requirements, fluid compatibility data, and cleanliness specifications.