Butt-welding Pipe Fittings CuNi Elbow 90D LR ASTM B466 UNS C70600 ASME B16.9
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
| Parameter | Details / Range |
|---|---|
| Dimensional Standard | ASME B16.9, ASME B16.28, MSS-SP-43 |
| Material Standard | ASTM B466 / ASME SB466 |
| Material Grade | UNS C70600 (CuNi 90/10 / CuNi10Fe1.6Mn / 2.0872) |
| Type | 90° Long Radius Elbow (LR, R=1.5D) |
| Nominal Size | 1/2" – 24" (DN15 – DN600) |
| Wall Thickness | Sch5S, Sch10S, Sch40S, Sch80S, Sch160S, XS, XXS |
| End Connection | Butt-weld ends (beveled for welding) |
| Chemical Composition | Cu: Bal. (min 88.6%), Ni: 9.0-11.0%, Fe: 1.0-1.8%, Mn: 1.0% max |
| Tensile Strength | 303–414 MPa |
| Yield Strength (0.2%) | ~110–135 MPa |
| Elongation | 30–42% |
| Density | ~8.94 g/cm³ |
| Corrosion Rate | ≤0.003 mm/a in seawater |
3. Application / Usage
This 90° LR elbow is ideal for demanding seawater and corrosive fluid systems :
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Marine & Shipbuilding: Seawater cooling systems, fire water systems, ballast lines, bilge systems
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Offshore Oil & Gas: Production platforms, subsea pipelines, FPSO units
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Desalination Plants: Seawater intake, reverse osmosis feed lines, brine discharge
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Power Generation: Condenser cooling systems, circulating water pipelines
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Chemical Processing: Corrosive fluid handling systems
4. Advantages
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Superior Corrosion Resistance: Exceptional resistance to seawater, pitting, crevice corrosion, and stress corrosion cracking; forms a protective oxide film that improves with service time
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Biofouling Resistance: Naturally resists marine biological growth; cuprous ion release retards organism settlement
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Cost-Effective: Lower nickel content provides significant material cost savings compared to C71500
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Excellent Weldability: No phase transformation during welding; maintains corrosion resistance
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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
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Preparation: Degrease and clean pipe ends and elbow weld areas thoroughly with approved solvent to remove oil, grease, and oxidation .
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Edge Preparation: For wall thickness ≥3mm, prepare a V-groove with 60-75° included angle .
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Alignment: Accurately align the elbow with connecting pipes; tack welds should be kept minimum and cleaned thoroughly .
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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 .
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Post-Weld: Allow gas flow over weld after completion; no post-weld heat treatment required .
7. Precautions
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Cleanliness: Requires higher degree of cleanliness than steel; use dedicated stainless steel tools
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Temperature Control: Interpass temperature must not exceed 120°C; pre-heat to ~25°C in cold/humid conditions
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Crater Sensitivity: Use downslope device to prevent crater cracks; taper current off at stops
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No Nitrogen: Must not be used as back-purge gas
8. Shipping & Delivery
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Standard delivery time: 10–100 days depending on order quantity and specifications .
9. Payment Terms
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Common international methods include T/T (Telegraphic Transfer) and L/C at sight (Letter of Credit) .
10. Packaging
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Products are securely packed in plywood cases or wooden crates to ensure safe transportation .
11. After-Sales / Return & Warranty Policy
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All products undergo 100% strict quality inspection before shipment.
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In case of quality issues, retain original packaging and provide relevant photos or third-party inspection reports.
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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.
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