Copper Nickel Fittings (90/10 & 70/30)| UNS C70600 / C71500
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Copper Nickel Fittings (90/10 & 70/30) | UNS C70600 / C71500 Brochure
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Descriptions
Navkar Metal Syndicate supplies high-quality Cupronickel Fittings engineered for marine, offshore, and chloride-bearing industrial systems. Available in 90/10 (UNS C70600) and 70/30 (UNS C71500) alloys, our fittings deliver superior corrosion resistance, leak-proof joints, and long-term structural integrity even under harsh seawater and process conditions.
Manufactured to tight dimensional tolerances, these fittings are ideally suited for desalination plants, heat exchangers, condensers, shipboard systems, and offshore platforms where issues such as biofouling, pitting, and crevice corrosion can compromise performance. Each fitting undergoes stringent inspection and is supplied with Mill Test Certificates (MTCs), traceable heat numbers, and export-grade packaging to ensure reliability from factory to field installation.
With a wide range of types, sizes, and pressure classes available, Navkar Metal Syndicate offers custom-engineered Cu-Ni fitting solutions that minimize maintenance downtime and enhance overall system lifespan — a trusted choice for global marine and process industries.
Chemical Composition
The chemical composition of Cupronickel Fittings supplied by Navkar Metal Syndicate conforms to international standards for 90/10 (UNS C70600) and 70/30 (UNS C71500) alloys. These precise alloying ranges ensure optimum corrosion resistance, strength, and weldability for demanding marine and industrial applications.
| Element | 90/10 Cu-Ni (C70600) | 70/30 Cu-Ni (C71500) |
|---|---|---|
| Copper (Cu) | 86 – 90 | 65 – 70 |
| Nickel (Ni) | 9 – 11 | 29 – 33 |
| Iron (Fe) | 0.8 – 1.8 | 0.4 – 1.0 |
| Manganese (Mn) | ≤ 1.0 | ≤ 1.0 |
| Lead (Pb) | ≤ 0.02 | ≤ 0.02 |
| Zinc (Zn) | ≤ 0.5 | ≤ 0.5 |
| Others (each) | ≤ 0.05 | ≤ 0.05 |
| Balance | Copper | Copper |
Note: All compositions are in weight percent. These alloys are standardized under ASTM B122/B151 and are widely used in marine fittings, condenser systems, and seawater piping assemblies.
Mechanical & Corrosion Properties — Fittings Only
The mechanical and corrosion properties of Cupronickel Fittings supplied by Navkar Metal Syndicate ensure dependable performance in demanding marine, offshore, and industrial applications. These alloys combine high strength, ductility, and superior seawater corrosion resistance with excellent fabrication and welding characteristics.
| Grade | Condition | Tensile Strength (UTS) | 0.2% Proof / Yield Strength | Hardness (HV) |
|---|---|---|---|---|
| 90/10 (C70600) | Annealed / Soft | 275 – 360 MPa | 90 – 160 MPa | 80 – 110 |
| 90/10 (C70600) | Forged / Cold-Worked | 350 – 500 MPa | 200 – 350 MPa | 110 – 200 |
| 70/30 (C71500) | Annealed / Soft | 345 – 420 MPa | 120 – 200 MPa | 95 – 130 |
| 70/30 (C71500) | Forged / Cold-Worked | 420 – 600 MPa | 220 – 400 MPa | 130 – 240 |
Corrosion Resistance
| Grade | Performance Characteristics |
|---|---|
| 90/10 (C70600) | Forms a protective copper-oxide film; very low corrosion rate (~0.002 mm/year); excellent anti-fouling behavior; safe water flow up to 3.0–3.5 m/s; reliable erosion and cavitation resistance. |
| 70/30 (C71500) | Exhibits superior seawater corrosion resistance; highly resistant to pitting, crevice corrosion, and biofouling; suitable for higher velocity systems (3.5–4.0 m/s); maintains performance even in polluted or turbulent seawater. |
Note: Mechanical and corrosion values are indicative of typical production results. For project-specific data or design references, consult Navkar Metal Syndicate’s technical support.
Applications
Cupronickel Fittings (90/10 & 70/30) supplied by Navkar Metal Syndicate are trusted worldwide for their corrosion resistance, durability, and long service life in seawater, offshore, and high-chloride environments. Engineered for precision and reliability, they ensure leak-proof connections in both marine and industrial systems.
- • Seawater piping networks and intake manifolds
- • Condensers, heat exchangers, and desalination plants
- • Offshore oil & gas platforms and process piping systems
- • Pump, valve, and pipeline connections in marine and industrial applications
- • High-chloride or aggressive aqueous systems requiring corrosion-resistant joints
- • Structural and process piping where leak-proof and long-lasting fittings are essential
- • Naval vessels and submarines (70/30 Cu-Ni used for non-magnetic applications)
These fittings offer a proven combination of strength, weldability, and resistance to seawater corrosion, making them a reliable choice for shipbuilding, desalination, power generation, and offshore engineering projects.
Types of Cupronickel Flanges Supplied
Navkar Metal Syndicate offers a complete range of precision-engineered Cupronickel Pipe Fittings in 90/10 (C70600) and 70/30 (C71500) alloys, available in butt weld, forged, threaded, and socket weld types. All fittings are manufactured to international standards, ensuring dimensional accuracy, leak-proof connections, and superior corrosion resistance for marine, offshore, and industrial systems.
Butt Weld / Fabricated Cupronickel Fittings
| Products | Products | Available Sizes |
|---|---|---|
| Copper Nickel Elbows – Long Radius | Copper Nickel Stub Ends | Sizes 1/2″ – 48″ |
| Copper Nickel Elbows – Short Radius | Copper Nickel Crosses | |
| Copper Nickel Reducing Elbows | Copper Nickel Reducing Crosses | |
| Copper Nickel 45° Elbows | Copper Nickel 180° LR Return Bends | |
| Copper Nickel Tees | Copper Nickel 180° SR Return Bends | |
| Copper Nickel Equal Tees | Copper Nickel Pipe Bends / Piggable Bends | |
| Copper Nickel Reducers | Copper Nickel Couplings | |
| Copper Nickel Concentric Reducers | Copper Nickel Pipe Nipples | |
| Copper Nickel Eccentric Reducers | Copper Nickel Forged / Plate Cut Rings | |
| Copper Nickel 3D Elbow | Copper Nickel End Caps | |
| Copper Nickel 5D Elbow | Copper Nickel Forged / Plate Circles |
High Pressure Forged Cupronickel Fittings
Available in Threaded (NPT/BSP) and Socket Weld types, manufactured to meet pressure ratings of 2000 LBS, 3000 LBS, 6000 LBS, and 9000 LBS. These fittings offer high strength and corrosion resistance for critical piping connections in marine, oil & gas, and chemical plants.
| Products | Products | Available Sizes |
|---|---|---|
| Copper Nickel 90° Elbows | Copper Nickel Couplings | Sizes 1/8″ – 4″ |
| Copper Nickel 45° Elbows | Copper Nickel Reducers | |
| Copper Nickel Street Elbows | Copper Nickel Inserts | |
| Cupro Nickel Tees | Cupro Nickel Caps | |
| Cupro Nickel Crosses | Cupro Nickel Unions |
Note: All fittings are produced as per ASTM B151 / B122 / B467 and conform to ASME B16.9, B16.11, B16.5, and MSS-SP standards. Custom dimensions and special configurations are available on request for large-scale industrial and marine projects.
Standards & International Equivalents:
Navkar Metal Syndicate supplies Cupronickel Fittings manufactured in accordance with international standards for marine, offshore, and industrial piping systems. Each batch conforms to globally recognized specifications ensuring dimensional accuracy, mechanical integrity, and corrosion performance.
| Type | 90/10 (Cu-Ni 90/10) | 70/30 (Cu-Ni 70/30) |
|---|---|---|
| Common Name | Cupronickel 90/10 Fittings | Cupronickel 70/30 Fittings |
| UNS | C70600 | C71500 |
| ASTM / ASME | ASTM B366 / B151 / B466; ASME B16.9 / B16.11 | ASTM B366 / B151 / B466; ASME B16.9 / B16.11 |
| EN / European | CW352H / EN 12449 | CW354H / EN equivalents |
| Other Equivalents | BS CN102 / DIN / WNR | BS CN107 / DIN / WNR |
| MIL / Defense | N/A | MIL-DTL-24202; MIL-F-1183; MIL-C-15726F (raw material) |
Note: All fittings are tested and certified as per applicable ASTM, ASME, and EN standards. Custom dimensions, tolerances, and pressure class options (2000–9000 LBS) are available upon request.
Common Names & International Identifiers
Cupronickel Fittings supplied by Navkar Metal Syndicate are globally recognized under various trade names and international identifiers. These designations ensure compatibility and standardization across marine, offshore, power generation, and desalination industries.
| Type | 90/10 (Cu-Ni 90/10) | 70/30 (Cu-Ni 70/30) |
|---|---|---|
| Common Trade Names | Cupronickel 90/10, Cupro Nickel 90/10, CuNi10Fe1Mn | Cupronickel 70/30, Cupro Nickel 70/30, CuNi30Mn1Fe |
| UNS Number | C70600 | C71500 |
| CDA Designation | Alloy 706 | Alloy 715 |
| EN / DIN Designation | CW352H / CuNi10Fe1Mn | CW354H / CuNi30Mn1Fe |
| BS / ISO Equivalents | CN102 / ISO CuNi10Fe1Mn | CN107 / ISO CuNi30Mn1Fe |
| JIS Designation | CuNi10 / C7060T | CuNi30 / C7150T |
These identifiers are used globally to specify Cupronickel pipe fittings, elbows, tees, reducers, and couplings across standards such as ASTM, ASME, EN, DIN, BS, and JIS. This ensures material traceability and interchangeability for international marine and industrial projects.
Common Product Forms & Dimensions
Navkar Metal Syndicate manufactures and supplies Cupronickel Pipe Fittings in 90/10 (C70600) and 70/30 (C71500) alloys, covering a complete range of seamless and welded butt-weld fittings. Each fitting is precision-engineered for marine, offshore, power generation, and chemical process industries, ensuring dimensional accuracy, corrosion resistance, and long service life in aggressive chloride-bearing environments.
| Specification | Details |
|---|---|
| Size |
Seamless Butt Weld Fittings: ½″ – 10″ Welded Butt Weld Fittings: ½″ – 48″ |
| Size Range | ½″ NB to 24″ NB in Sch 10s, 40s, 80s, 160s, XXS (DN6 ~ DN100) |
| Dimensions | ASME B16.28, MSS-SP-43, ASME/ANSI B16.9, BS4504, BS1560, BS10 |
| Type | DN15 – DN1200 |
| Connection | Welded |
| Manufacturing Process | Push, Press, Forge, Cast, Machined |
| Origin & Mills | Japan, India, USA, Korea, Europe, Ukraine, Russia |
| Key Markets & Industries | Bitumen Upgraders, Heavy Oil Refineries, Nuclear Power Plants (Seamless), Petrochemicals, Acid Handling Units |
| Specialized Manufacturer of | 90° / 45° Elbows, Tees, Crosses, Reducers, Pipe Caps, Stub Ends, Pipe Bends |
| Thickness Range | SCH 10, SCH 20, SCH 30, STD SCH 40, SCH 60, XS, SCH 80, SCH 100, SCH 120, SCH 140, SCH 160, XXS — available with NACE MR 01-75 compliance |
| Bending Radius | R = 1D, 2D, 3D, 5D, 6D, 8D, 10D or custom per MSS-SP-43 |
| Elbow Angles |
22.5°, 30°, 45°, 90°, 180° — available in 1D to 40D radius Standards: ASME B16.9, B16.28, B16.25, MSS SP-75, JIS B2311/B2312/B2313, DIN 2605, BS, GB, ISO |
| Test Certificates |
EN 10204 / 3.1B — Raw Material Certificate 100% Radiography Test Report Third-Party Inspection (TPI) Reports — Lloyds, DNV, BV, SGS, etc. |
| Export Destinations | Canada, Ireland, Brazil, Dubai, Iran, Spain, Thailand, Egypt, Saudi Arabia, Singapore, Indonesia, Ukraine, Korea, Oman, India, USA, Peru, and more. |
| Material Certification | Material Test Certificates (MTC) as per EN 10204 3.1 / 3.2, with optional certification for NACE MR0103 and NACE MR0175 compliance. |
All Cupronickel fittings from Navkar Metal Syndicate are fully traceable by heat number, batch number, and MTC documentation. Custom fabrication, bending radii, and non-standard dimensions are available for marine, offshore, desalination, and nuclear-grade piping systems.
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