Butt-welding Pipe Fittings CuNi Elbow 90D LR ASTM B466 UNS C70600 ASME B16.9

Product Specification

Butt-welding Pipe Fittings CuNi Elbow 90D LR ASTM B466 UNS C70600 ASME B16.9

1. Product Description

This product is a 90-degree Long Radius (LR) butt-welding elbow manufactured from UNS C70600 (CuNi 90/10) in accordance with ASTM B466 and ASME B16.9 standards . The LR design features a radius of curvature equal to 1.5 times the pipe diameter (R = 1.5D), ensuring smooth fluid flow with minimal pressure loss . CuNi 90/10 is a solid-solution copper-nickel alloy with an alpha-phase structure, offering an excellent balance of corrosion resistance, strength, and cost-effectiveness .

2. Key Product Parameters

3. Application / Usage

This 90° LR elbow is ideal for demanding seawater and corrosive fluid systems :

• Marine & Shipbuilding: Seawater cooling systems, fire water systems, ballast lines, bilge systems 

• Offshore Oil & Gas: Production platforms, subsea pipelines, FPSO units 

• Desalination Plants: Seawater intake, reverse osmosis feed lines, brine discharge 

• Power Generation: Condenser cooling systems, circulating water pipelines 

• Chemical Processing: Corrosive fluid handling systems 

4. Advantages

• Superior Corrosion Resistance: Exceptional resistance to seawater, pitting, crevice corrosion, and stress corrosion cracking; forms a protective oxide film that improves with service time 

• Biofouling Resistance: Naturally resists marine biological growth; cuprous ion release retards organism settlement 

• Cost-Effective: Lower nickel content provides significant material cost savings compared to C71500 

• Excellent Weldability: No phase transformation during welding; maintains corrosion resistance 

• Long Radius Design: R=1.5D ensures smooth flow and reduced turbulence 

5. Functions

The 90° LR elbow changes the direction of fluid flow within a piping system by 90 degrees with minimal pressure drop, thanks to the long radius design that reduces flow resistance and turbulence .

6. Installation Instructions

1. Preparation: Degrease and clean pipe ends and elbow weld areas thoroughly with approved solvent to remove oil, grease, and oxidation .

2. Edge Preparation: For wall thickness ≥3mm, prepare a V-groove with 60-75° included angle .

3. Alignment: Accurately align the elbow with connecting pipes; tack welds should be kept minimum and cleaned thoroughly .

4. Welding: Use TIG (GTAW) process with ERCuNi filler wire (AWS A5.7). Shielding: 100% pure argon; back-purging required for root pass to prevent oxidation. Maintain short arc length and use stringer bead technique .

5. Post-Weld: Allow gas flow over weld after completion; no post-weld heat treatment required .

7. Precautions

• Cleanliness: Requires higher degree of cleanliness than steel; use dedicated stainless steel tools 

• Temperature Control: Interpass temperature must not exceed 120°C; pre-heat to ~25°C in cold/humid conditions 

• Crater Sensitivity: Use downslope device to prevent crater cracks; taper current off at stops 

• No Nitrogen: Must not be used as back-purge gas 

8. Shipping & Delivery

• Standard delivery time: 10–100 days depending on order quantity and specifications .

9. Payment Terms

• Common international methods include T/T (Telegraphic Transfer) and L/C at sight (Letter of Credit) .

10. Packaging

• Products are securely packed in plywood cases or wooden crates to ensure safe transportation .

11. After-Sales / Return & Warranty Policy

• All products undergo 100% strict quality inspection before shipment.

• In case of quality issues, retain original packaging and provide relevant photos or third-party inspection reports.

• Specific return, exchange, and warranty terms are subject to the final sales contract agreement.

FAQ

1. Are you trading company or manufacturer ?
    We are manufacturer ,You can see the certification.
2. How long is your delivery time?
    Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.
3. Do you provide samples ? is it free or extra ?
    Yes, we could offer the sample for free charge but need pay the cost of freight.
4. What is your terms of payment ?
    Payment<=1000USD, 100% in advance. Payment>=1000USD, 50% T/T in advance ,balance before shippment.