Stainless Steel Capillary Tube for Medical Application Components
Capillary Tubes in Semiconductor: Ultra-High Purity Requirements
Semiconductor manufacturing requires the highest standards for material purity, surface quality, and cleanliness. Stainless steel capillary tubes are used in gas delivery systems, vacuum systems, and process instrumentation. 316L stainless steel is the preferred grade for semiconductor applications due to its low carbon content, superior corrosion resistance, and electropolishability.
Applications in Semiconductor Manufacturing
Gas Delivery Systems
- Specialty gas delivery: Precision gas mixing and delivery for CVD, PVD processes
- Carrier gas lines: High-purity gas transport
- Gas mixing manifolds: Multi-gas delivery systems
Vacuum Systems
- Vacuum pumping lines: Connection to vacuum pumps
- Pressure sensing: Vacuum pressure measurement
- Leak detection: Helium leak testing lines
Process Instrumentation
- Temperature sensing: RTD and thermocouple protection tubes
- Pressure sensing: Process pressure monitoring
- Flow measurement: Mass flow controller connections
Material Requirements
| Parameter | Requirement |
|---|---|
| Material Grade | 316L (low carbon, ≤0.03%) |
| Surface Finish | Electropolished, Ra ≤0.25μm (EP grade) |
| Weldability | Orbital welding with purge gas protection |
| Cleanliness | Ultra-clean, double-bag packaging |
| Documentation | EN 10204 3.1, SEMI standards compliance |
Semiconductor Standards
- SEMI F20 — General requirements for process equipment
- SEMI S2 — Safety guidelines for semiconductor equipment
- ASTM A269/A269M — Seamless and welded austenitic stainless steel tubing
- ISO 14644 — Cleanroom classification
Common Sizes for Semiconductor
| Application | OD (mm) | Wall (mm) |
|---|---|---|
| Gas delivery | 3.0-6.0 | 0.3-0.5 |
| Vacuum lines | 6.0-12.0 | 0.5-1.0 |
| Pressure sensing | 2.0-4.0 | 0.25-0.5 |
| Temperature sensing | 3.0-6.0 | 0.3-0.5 |
Surface Treatment Requirements
- Electropolishing: Ra ≤0.25μm for ultra-high purity
- Passivation: Citric acid passivation
- Orbital welding: Purge gas protection for clean welds
- Ultra-clean packaging: Double-bag, cleanroom packaging
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