C70600 – CuNi 90-10% – CuNi10Fe1Mn

GNEE supplies C70600 copper-nickel tubes composed of 90% copper and 10% nickel, engineered for exceptional corrosion and biofouling resistance in harsh marine and industrial environments.

Key Properties: Superior resistance to impingement attack, stress corrosion cracking (SCC), and seawater-induced erosion, making it a trusted choice for high-velocity cooling systems.

Thanks to their durability and anti-fouling properties, CuNi 90/10 tubes are widely used in marine condensers, heat exchangers, and desalination plants, where they outperform other copper alloys under demanding thermal and chemical conditions.

Note: The values above are typical and for general reference only. For exact specifications, consult GNEE for certified mill test reports.

GNEE supplies both tempers. Choose O61 for bending and forming operations; choose H55 for higher strength requirements.

C70600 CuNi 90/10 is the preferred choice for seawater applications because:

It outperforms aluminum brass and admiralty brass in high-velocity seawater (above 2 m/s)

It provides superior biofouling resistance – marine organisms do not readily attach

It offers excellent resistance to stress corrosion cracking – critical for thermal cycling

It has proven long-term reliability in desalination and offshore platforms

It is cost-effective compared to titanium or super duplex stainless steels

Q1: What is the difference between C70600 and C71500 copper nickel tubes?
A: C70600 (90/10 CuNi) contains approximately 10% nickel and offers excellent corrosion resistance with higher thermal conductivity. C71500 (70/30 CuNi) contains approximately 30% nickel, providing higher strength and better resistance to erosion in very high-velocity seawater.

Q2: What are the international equivalents of UNS C70600?
A: UNS C70600 has the following equivalents: BSI CN102 (UK), ISO CuNi10Fe1Mn, EN CW352H (Europe), DIN 2.1972 (Germany), Chinese BFe10-1-1, and JIS C7060 (Japan).

Q3: What are the available tempers for ASTM B111 C70600 tubes?
A: ASTM B111 C70600 tubes are available in O61 (annealed) – soft and ductile, or H55 (light-drawn) – stronger with smooth surface finish. GNEE supplies both tempers.

Q4: What is the typical tensile strength of C70600 CuNi 90/10 tube?
A: C70600 tube has a typical tensile strength of 345 MPa (50 ksi) and yield strength of 125 MPa (18 ksi) in the annealed condition. Light-drawn temper (H55) has higher strength.

Q5: Where is C70600 CuNi 90/10 tube commonly used?
A: C70600 tube is commonly used in marine condensers, heat exchangers, desalination plants, ballast water systems, offshore platforms, and shipboard cooling systems.

Q6: Why is C70600 resistant to biofouling in seawater?
A: C70600 has natural anti-fouling properties because copper ions released from the surface are toxic to marine organisms, preventing barnacles, mussels, and algae from attaching.

Q7: What is the maximum recommended seawater velocity for C70600 tubes?
A: C70600 tubes can withstand seawater velocities up to 3-4 m/s without significant erosion or impingement attack, which is superior to aluminum brass (limited to ~2 m/s).

Q8: What is the thermal conductivity of C70600 CuNi 90/10 tube?
A: C70600 has a thermal conductivity of 45 W/m-K at 20°C (26 BTU/(ft²·ft·h·°F) at 70°F) , which is excellent for heat transfer applications like condensers and heat exchangers.

Q9: Can C70600 CuNi 90/10 tubes be welded?
A: Yes, C70600 tubes can be welded using TIG, MIG, or resistance welding methods. GNEE recommends using matching filler metal ERCuNi for optimal corrosion resistance.

Q10: What ASTM specifications cover C70600 copper nickel tubes?
A: C70600 tubes are covered by ASTM B111 (condenser tubes), ASTM B395 (heat exchanger tubes), ASTM B466 (seamless pipe), and ASTM B552 (welded tube).

Q11: What is the melting point of C70600 CuNi 90/10 alloy?
A: C70600 has a melting range of 1099-1149°C (2010-2100°F) , which is typical for copper-nickel alloys.

Q12: How does GNEE ensure quality for C70600 CuNi 90/10 tubes?
A: GNEE provides EN10204 3.1 mill test certificates, offers third-party inspection (SGS, TUV, DNV, Lloyds, ABS), and performs dimensional, chemical, mechanical, and non-destructive testing per ASTM standards.

Every C70600 Batch Gets Tested. Here's How.

C70600 is used in seawater and high-temperature environments. A small defect means big failure. That's why we don't skip steps.

What we test on C70600:

Actual chemistry (not just certificate)

Tensile & yield strength

Hardness across multiple points

Flattening / flaring (for tubes)

Eddy current or hydrostatic (no hidden leaks)

Surface & dimensional check

Who checks: Our lab + optional SGS, BV, Lloyds
What you get: MTC with heat number traceability

C70600 corrodes if wet. Scratches ruin surface quality. Bad packing = rejected material.

Our packing rules for C70600:

Tubes: capped both ends + foam wrap + wooden spool or woven bag

Plates/sheets: anti-rust paper + plywood crate

Rods/bars: VCI film + fumigation-free case

Wire: spooled + pallet wrapped

Strip: interleaved paper + carton or coil box

All C70600 packaging includes:

Moisture barrier

Edge protection (where needed)

Clear labeling (grade, heat, size, PO number)

We pack for sea freight, air freight, or warehouse storage.

Most sellers are traders. We are not. We run the equipment that forms, sizes, and finishes C70600.

What we use for C70600:

Horizontal caster (billet control)

Reverse extrusion press (seamless starts here)

Cold pilger & draw benches (tube precision)

Roller leveler & slitter (plate/strip)

Annealing furnace (consistent temper)

Pickling line (clean surface)

What we don't do: mix scrap, skip heat treatment, fake test reports.

Result: C70600 that actually meets ASTM B151 / ASME SB151.

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