Copper Nickel Alloy C70600 & C71500 Marine Grade Alloys

GNEE specializes in Copper Nickel Alloys, including C70600 (Cu-Ni 90/10) and C71500 (Cu-Ni 70/30), renowned for their exceptional corrosion and erosion resistance in seawater, superior anti-fouling properties, and high strength, making them indispensable for harsh marine environments and demanding heat exchange systems.

Copper Nickel Products are manufactured in various forms, including Pipes, Tubes, Pipe Fittings, Flanges, Bars, and Sheets/Plates, designed to withstand aggressive conditions of seawater, brackish water, and high-velocity fluid flows.

Copper Nickel (Cu-Ni) Alloys are copper-based alloys containing nickel as the primary alloying element, with minor additions of iron and manganese. These alloys are specifically engineered for excellent corrosion resistance, particularly in seawater and brackish water environments.

Inherent advantages include:

Exceptional Seawater Corrosion Resistance: Outstanding resistance to general corrosion, pitting, and crevice corrosion in seawater and other saline solutions.

Erosion & Impingement Resistance: Superior resistance to erosion-corrosion, especially in high-velocity flows, crucial for piping and heat exchanger tubes.

Anti-Fouling Properties: C70600 (90/10 Cu-Ni) demonstrates good resistance to biofouling (growth of marine organisms), reducing maintenance needs.

High Strength & Ductility: Good mechanical strength and ductility, allowing for ease of fabrication while maintaining structural integrity.

Selection guidance: Choose C71500 for higher strength, superior erosion resistance in high-velocity and turbulent seawater, and better performance at higher temperatures. Choose C70600 for cost-sensitive projects with lower velocity seawater, where anti-fouling is the primary concern.

Pipes & Tubes: Seamless and welded for heat exchangers, condensers, piping systems, and desalination plants.

Pipe Fittings: Butt-weld fittings (elbows, tees, reducers, caps), threaded fittings, and socket weld fittings.

Flanges: Weld Neck, Slip-On, Blind, Socket Weld, Threaded, Lap Joint, and Orifice flanges.

Bars & Rods: Round, square, flat, and hexagonal bars for shafts, fasteners, and general machining.

Sheets & Plates: Hot rolled and cold rolled for tank fabrication, structural components, and heat exchanger plates.

For high-velocity seawater: C71500 contains 30% nickel, providing superior erosion and impingement resistance in fast-flowing and turbulent seawater conditions. C70600 with 10% nickel is limited to lower velocities.

For high-temperature service: C71500 maintains mechanical properties at higher temperatures, making it suitable for power plant condensers and brine heaters in desalination plants.

For higher strength requirements: C71500 tensile strength is 55-75 ksi vs C70600 at 40-55 ksi. For high-pressure piping systems, choose C71500.

For anti-fouling performance: C70600 is recognized for its better resistance to biofouling (marine organism attachment). For seawater intake lines and ship hulls, C70600 is often preferred.

For cost-sensitive projects: C70600 has lower nickel content (10% vs 30%), making it more economical. For general marine piping with lower velocity seawater, C70600 provides good corrosion resistance at lower cost.

For higher thermal conductivity: C70600 has higher thermal conductivity (26 Btu·ft/(hr·ft²·°F) vs C71500 at 17), making it better for heat exchanger applications where heat transfer efficiency is critical.

Chemical verification: Spectro analysis (PMI) to verify composition per ASTM standards.

Mechanical testing: Tensile (55-75 ksi), yield (20-30 ksi), elongation (30-45%), hardness (60-90 HRB).

Hydrostatic testing: Each pipe pressure tested per ASTM B466.

Eddy current testing: For seamless tubes, per ASTM E243.

Dimensional inspection: OD, wall thickness, length per ASTM B466.

Certification: EN 10204 3.1 Mill Test Certificates provided.

Third-party inspection: Available upon request.

Bundling: Pipes formed into hexagonal bundles with steel straps every 1.5 meters. Plywood separators between layers prevent surface scratching.

End protection: Plastic caps on both ends keep debris out.

Bundle weight: Maximum 2000 kg (4400 lbs) per bundle.

Labels: Alloy (C71500 70/30), heat number, OD × wall thickness, length, quantity, PO number, net weight, gross weight.

Export packaging: ISPM-15 certified wooden crates for cut lengths.

Sea freight protection: Desiccant bags inside moisture-barrier plastic liner for tropical destinations.

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