TOBO INDUSTRIAL (SHANGHAI) CO., LTD
| Samples | Provide |
| Delivery Time | 15-30 workdays |
| End Type | Plain End |
| Packaging Details | plywood case or wooden case |
| Payment Terms | Western Union, T/T |
| Sizerange | 1/2 inch to 24 inches |
| Customized Support | OEM, ODM, OBM |
| Pressure Rating | 3000 psi |
| Temper | Soft, Half Hard, Hard |
| Product Type | Copper Nickel Elbow |
| End Connections | Butt Weld, Socket Weld, Threaded |
| Supply Ability | 100000000 Piece/Pieces per Month |
| Product Name | Copper Nickel Elbow |
| Diameterrange | 1/2 inch to 24 inches |
| Head Type | Round |
| Product | Copper Nickel Elbow |
| Surface Finish | Pickled, Sand Blast, Passivation |
| Model Number | Elbow |
| Brand Name | TOBO/ METAL |
| Place of Origin | China |
| Certification | BV/ SGS/ TUV/ ISO |
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Product Specification
| Samples | Provide | Delivery Time | 15-30 workdays |
| End Type | Plain End | Packaging Details | plywood case or wooden case |
| Payment Terms | Western Union, T/T | Sizerange | 1/2 inch to 24 inches |
| Customized Support | OEM, ODM, OBM | Pressure Rating | 3000 psi |
| Temper | Soft, Half Hard, Hard | Product Type | Copper Nickel Elbow |
| End Connections | Butt Weld, Socket Weld, Threaded | Supply Ability | 100000000 Piece/Pieces per Month |
| Product Name | Copper Nickel Elbow | Diameterrange | 1/2 inch to 24 inches |
| Head Type | Round | Product | Copper Nickel Elbow |
| Surface Finish | Pickled, Sand Blast, Passivation | Model Number | Elbow |
| Brand Name | TOBO/ METAL | Place of Origin | China |
| Certification | BV/ SGS/ TUV/ ISO |
CuNi 70/30 Copper Nickel 90° Elbow ASME B16.9 Butt Weld Fitting Marine Offshore
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. |
Company Details
Business Type:
Manufacturer,Distributor/Wholesaler,Importer
Total Annual:
>1000000
Employee Number:
>100
Ecer Certification：
Verified Supplier
TOBO INDUSTRIAL (SHANGHAI) Co., Ltd. is a professional supplier of pipeline products, located in Shanghai, with convenient transportation and beautiful environment. Dedicated to strict quality control and customer service. Our experienced staff can readily discuss your requirements to ensu... TOBO INDUSTRIAL (SHANGHAI) Co., Ltd. is a professional supplier of pipeline products, located in Shanghai, with convenient transportation and beautiful environment. Dedicated to strict quality control and customer service. Our experienced staff can readily discuss your requirements to ensu...
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