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CuNi 70/30 Copper Nickel 90° Elbow ASME B16.9 Butt Weld Fitting Marine Offshore
| Place of Origin | China |
|---|---|
| Brand Name | TOBO/ METAL |
| Certification | BV/ SGS/ TUV/ ISO |
| Model Number | Elbow |
| Minimum Order Quantity | 1 PC |
| Price | Negotiatable |
| Packaging Details | plywood case or wooden case |
| Delivery Time | 15-30 workdays |
| Payment Terms | Western Union, T/T |
| Supply Ability | 100000000 Piece/Pieces per Month |
Product Details
| Product Name | Copper Nickel Elbow | Sizerange | 1/2 Inch To 24 Inches |
|---|---|---|---|
| End Connections | Butt Weld, Socket Weld, Threaded | Pressure Rating | 3000 Psi |
| Customized Support | OEM, ODM, OBM | End Type | Plain End |
| Samples | Provide | Temper | Soft, Half Hard, Hard |
| Surface Finish | Pickled, Sand Blast, Passivation | Product Type | Copper Nickel Elbow |
| Diameterrange | 1/2 Inch To 24 Inches | Head Type | Round |
| Product | Copper Nickel Elbow |
Product Description
CuNi 70/30 Copper Nickel 90° Elbow ASME B16.9 Butt Weld Fitting Marine Offshore
1.Product Description
The Copper Nickel Elbow is a premium-grade piping directional fitting specifically engineered for marine and high-chloride corrosive environments. By virtue of solid-solution strengthening between copper and nickel, it inherently possesses a dual protective barrier—passivation and bio-inhibition—at the metallurgical level. Unlike external anti-corrosion measures such as coatings or cathodic protection, the corrosion resistance of a CuNi elbow is intrinsic to its material genome. Designed for a typical service life of 25+ years, it serves as the core enabler for “maintenance-free” or “low-maintenance” seawater system design philosophies.
2.Product Applications
| Priority | Application Type | Specific Scenarios & Justification |
| Top/Mandatory | Safety-Critical Systems (SIL-rated) | Ship fire mains, emergency cooling loops, nuclear plant auxiliary cooling—due to exceptional reliability and resistance to sudden failure. |
| Highly Recommended | High-Velocity / Turbulent Sections | Pump discharges, elbow cascades, pipe diameter reductions—superior erosion-corrosion resistance over conventional stainless steels. |
| Cost-Effective | Long-Distance Large-Bore Pipelines | Main seawater intake/outfall headers—lower total life-cycle costs (capex+opex+replacement) than titanium, and far less maintenance than coated carbon steel. |
| Alternative/Backup | Temporary or Non-Critical Lines | May be used selectively under extreme budget constraints, but compromising reliability in these areas is generally discouraged. |
3.Product Advantages
| Comparison Dimension | CuNi Elbow | 316L Stainless Elbow | Duplex Stainless Elbow | Carbon Steel + Coated Elbow |
| Corrosion Rate in Static Seawater | < 0.005 mm/a | 0.02 ~ 0.1 mm/a (pitting-prone) | 0.005 ~ 0.02 mm/a | 0.1~0.5 mm/a (coating intact); rapid acceleration once coating fails |
| Biofouling Resistance | ★★★★★ (active Cu-ion inhibition) | ★★ (biofilm prone) | ★★★ (cleaner, but no active inhibition) | ★ (severe fouling, frequent cleaning required) |
| SCC Susceptibility to Chlorides | Negligible (immune) | Moderate-High (esp. at elevated temps) | Moderate (strict temp control required) | Low (but dominated by uniform corrosion) |
| Initial Material Cost | Moderate-High | Moderate | High | Low |
| 25-Year Life-Cycle Cost (incl. O&M) | ★★★★★ (lowest) | ★★★ (frequent repairs/replacements) | ★★★★ (good, but high welding cost) | ★★ (extremely high coating repair costs) |
| Welding Complexity | Low (no pre/post heat) | Moderate | High (strict heat input control) | Low (but needs coating touch-up) |
| Emergency Availability | Readily stocked in standard sizes | Readily stocked | Limited | Readily stocked |
4.Key Product Specifications
| Parameter Category | Quick Selection Guide & Values |
| Economic Flow Velocity Range | For seawater: optimum economic velocity 2.0 – 3.5 m/s; if >4.5 m/s, erosion-corrosion margin must be re-verified. |
| Wall Thickness Corrosion Allowance (Suggested Design Value) | C70600: add 0.5–1.0 mm extra allowance; C71500: add 0.3–0.8 mm (for 25-year design life). |
| Bend Radius Selection Rule | Low resistance & high cleanliness → select Long Radius (LR, R=1.5D); Space/weight constrained → select Short Radius (SR, R=1.0D); Pigging required → must select ≥3D bend. |
| Temperature Derating Factor | Above 100°C: MAWP decreases by approximately 1.5%–2% per 10°C rise; at 200°C, derated to 70%–75% of ambient rating. |
| Dissimilar Metal Connection Caution | Avoid direct contact with carbon steel, aluminum, or zinc (galvanic corrosion risk). Use isolating flanges or resin gaskets if connection is unavoidable. |
| Filler Metal Quick Reference | C70600 use ERCuNi-7 or A5.7 Class 70/30; C71500 use matching-grade filler; shielding gas: 100% Argon (for GTAW). |
| Surface Cleanliness Acceptance | After pickling, per ISO 8501-1, grade not less than Sa 2½ (blasting) or Be grade (pickling); chloride residue < 30 mg/m². |
| Rejection Criteria on Arrival | Reject if any of the following: ① Cracks, folds, or laminations; ② Wall thickness negative deviation exceeds 12.5%; ③ Ovality > 8%; ④ Bevel end mechanical damage > 2mm depth. |
| Storage Environment Requirements | Indoor dry environment; for outdoor storage, raise off ground ≥200mm with waterproof covers; strictly avoid mixed storage with acid chemicals or salts. |
FAQ
1. Who are we?
We are based in Shanghai, China, start from 2014,sell to South America(25.00%),Mid East(15.00%),Southeast Asia(10.00%),North
America(9.00%),Eastern Europe(8.00%),South Asia(5.00%),Oceania(5.00%),Western Europe(5.00%),Central America(5.00%),Domestic
Market(5.00%),Africa(3.00%),Southern Europe(2.00%),Northern Europe(2.00%),Eastern Asia(1.00%).
There are total about 11-50 people
in our office.
2. How can we guarantee quality?
Always a pre-production sample before mass production;
Always final Inspection before shipment;
3.What can you buy from us?
Elbow/Reducer/Tee/Olet/Pipe Fitting, Steel
4. Why should you buy from us not from other suppliers?
We are one of the Professional manufacturers Exporter Pipeline products in China .Our company was established in 1998, the plant
covers 550, 000 square meters and a construction area of 6,8,000square meters, existing 260 workers and 45 technicians.
5. What services can we provide?
Accepted Delivery Terms: CFR,CIF,EXW,FCA,Express Delivery；
Accepted Payment Currency:USD,EUR,JPY,CAD,AUD,HKD,GBP,CNY,CHF;
Accepted Payment Type: T/T,L/C,,Credit Card,PayPal,Western Union,Cash,Escrow;
Language Spoken:English,Chinese,Spanish,Portuguese
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