70/30 CuNi Capillary Tubes Seamless Alloy Pipes Corrosion-Resistant for

Product Specification

70/30 CuNi Capillary Tubes Seamless Alloy Pipes Corrosion-Resistant for Semiconductor

1. Product Description

70/30 Copper Nickel Seamless Capillary Tubes (UNS C71500) are high-performance alloy tubes composed of approximately 70% copper and 30% nickel. Manufactured using a seamless cold-drawn process, these tubes are free of welds, featuring a dense and uniform structure that provides higher pressure resistance and reliability compared to welded tubes. Compliant with ASTM B111 standards, this product is an ideal choice for semiconductor equipment, precision instruments, and corrosion-resistant piping systems.

2. Key Specifications

3. Applications

• Semiconductor Manufacturing Equipment: Precision delivery lines for high-purity gases and chemicals

• Heat Exchange Systems: Condensers, evaporators, and heat exchanger tube bundles

• Marine Piping Systems: Shipboard seawater lines and desalination equipment

• Chemical Processing Equipment: Corrosion-resistant process pipes, valves, and pump components

• Precision Instruments: Electronic shielding materials, antenna materials, and spring terminals

4. Product Advantages

• Superior Corrosion Resistance: 70/30 copper nickel alloy offers excellent resistance to seawater corrosion, pitting, crevice corrosion, and stress corrosion cracking, making it ideal for harsh environments such as marine and chemical applications

• High Strength with Good Toughness: The approximate 30% nickel content significantly enhances the alloy's strength while maintaining excellent ductility and impact resistance

• High Reliability of Seamless Structure: The seamless process eliminates weld defects, ensuring long-term stable operation under high pressure and high temperature conditions

• Anti-Biofouling Properties: Copper ion release provides natural resistance to marine organism attachment

• Excellent Workability: Can be bent, formed, welded, and processed with ease; thermal expansion coefficient close to carbon steel facilitates connection to steel structures

5. Product Functions

• Precision delivery of high-purity gases, chemicals, and corrosive fluids

• Efficient heat conduction for heat exchange and cooling systems

• Reliable corrosion-resistant piping solutions for semiconductor and precision equipment

6. Operating Instructions

1. Pre-Installation Inspection: Verify that outer diameter, wall thickness, length, and other specifications meet design requirements

2. Cutting & Deburring: Use specialized tube cutting tools to cut and remove burrs from tube ends, ensuring smooth and flat surfaces

3. Connection Methods: Can be connected via compression fittings, flared fittings, or welding. Professional technicians are recommended for installation

4. Pressure Testing: After installation, conduct hydrostatic or pneumatic testing according to design pressure to confirm no leakage

5. Regular Maintenance: Inspect the piping system periodically and clean surface deposits as needed

7. Precautions

• Store in a dry, well-ventilated environment, avoiding direct contact with corrosive chemicals

• Prevent bending deformation or surface scratches during transportation and handling

• Use matching filler materials and process parameters when welding; refer to applicable welding specifications

• Do not use beyond the designed temperature and pressure range

• Lead (Pb) and Sulfur (S) are strictly controlled harmful impurities; this product meets stringent quality standards

8. Shipping Information

• Lead Time: 7-15 working days for standard specifications; 15-30 working days for custom sizes and special orders (subject to contract terms)

• Shipping Methods: Sea freight, air freight, and international express services available upon request

• Shipping Packaging: Packed in wooden crates or pallets to ensure product safety during transit

• Shipping Notification: Tracking number and estimated delivery date will be provided after shipment

9. Payment Terms

10. Packaging

• Individual Protection: Each tube is wrapped with plastic protective film or anti-rust paper

• Bundling: Tubes are bundled by specification and quantity, with plastic end caps on both ends for port protection

• Outer Packaging: Export-standard wooden crates or sturdy wooden pallets, secured with steel straps

• Labeling: Outer packaging is marked with product specifications, material grade, quantity, gross weight, net weight, and batch number

11. After-Sales Service (Returns & Exchanges)

• Quality Assurance: Products undergo 100% inspection before shipment; material test reports and inspection certificates are provided with each delivery

• Return & Exchange Policy:

  • For quality-related issues (material discrepancies, dimensional deviations, defects, etc.), returns or exchanges can be applied for within 15 days of receipt

  • Returns or exchanges due to customer selection errors or improper use will be handled on a case-by-case basis

• Technical Support: After-sales technical consultation is available to assist with installation and usage inquiries

• Warranty Period: 12 months from the date of delivery; free replacement is provided for product quality issues within this period