ASTM B111 C71500 Copper Nickel Tubes for seawater cooling heat exchangers

C71500 Copper Nickel Tubes PDF

C71500 Copper Nickel Size & Price PDF

ASTM B111 C71500 Copper-Nickel Tubes (CuNi 70/30) are high-performance copper-based alloys containing 70% copper and 30% nickel, with small additions of iron and manganese for superior corrosion resistance, strength, and durability. These tubes are widely used in marine, offshore, heat exchanger, and industrial piping systems due to their excellent resistance to seawater, biofouling, and stress corrosion cracking.

1. High Corrosion Resistance: Excellent performance in seawater, weak acids, and high-temperature oxidation (corrosion rate ≤0.003 mm/a).

2. Mechanical Excellence: Tensile strength 350-550 MPa, elongation 20-40%, combining toughness and plasticity.

3. Machinability: Supports cold/hot working, welding (TIG/MIG), and deep drawing; surface finish up to Ra 0.1μm.

4. Temperature Adaptability: Design temperature up to 371°C (annealed state), no brittleness at cryogenic conditions.

Marine & Shipbuilding – Used in seawater cooling, heat exchangers, condensers
Oil & Gas Industry – Offshore platforms, desalination plants, piping systems
Power Generation – Heat exchangers, nuclear power plants, cooling systems
Aerospace & Defense – Hydraulic tubing, high-performance applications
Chemical Processing – Acid-resistant piping, corrosion-resistant equipment

Q: Is C71500 pipe magnetic?

A: No, C71500 is generally non-magnetic. Its microstructure is a single-phase solid solution, which does not exhibit ferromagnetic properties.

Q: What is the melting point of C71500?

A: It does not have a single melting point but a melting range, typically between 1170°C and 1240°C (2140°F and 2264°F).

Q: How does C71500 resist erosion-corrosion?

A: Its high inherent strength and the durability of its protective film allow it to withstand high flow velocities (typically up to 3.5-4 m/s in seawater) without significant damage.

Q: Can C71500 handle acidic or alkaline environments?

A: It has good resistance to neutral and alkaline solutions and non-oxidizing acids. However, it is not recommended for strongly oxidizing acids like nitric acid.

Q: How do you weld C71500 copper-nickel pipe?

A: It is readily weldable using Gas Tungsten Arc Welding (GTAW/TIG) and Gas Metal Arc Welding (GMAW/MIG) processes. Use matching filler metals like ERCuNi or 70/30 CuNi rods and ensure proper shielding gas to prevent oxidation.

Gnee is a premier manufacturer and international supplier of comprehensive copper and copper alloy products, committed to delivering excellence in copper tubes, copper sheets, copper plates, copper bars, copper rods, copper wires, and copper strips.

Our Extensive Product Portfolio & Specifications:

Copper Tubes & Pipes:
We supply a full range including **Capillary Tubes, Thin-Walled Copper Tubes, Thick-Walled Copper Tubes, Round Pipes, Square Pipes, Rectangular Pipes, Welded Pipes, Seamless Pipes, Heat Exchanger Tubes, and Condenser Tubes.

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Our flat-rolled products cover Copper Foils, Thin Sheets, Thick Plates, and Circles (Round Plates) in various tempers (O, H) for diverse applications.

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Common Alloys & International Standards:

We master a wide array of materials compliant with ASTM, EN, JIS, and GB standards:

Pure Copper: C11000 (ETP Copper), C10200 (Oxygen-Free Copper), C12000 (DLP)

Brass Alloys: C26000 (Cartridge Brass), C27200 (Brass), C28000 (Muntz Metal)

Copper-Nickel: C70600 (CuNi90/10), C71500 (CuNi70/30)

Phosphor Bronze: C51900, C52100, C54400

Serving industries from HVAC/R and plumbing to electrical, automotive, and marine engineering, Gnee provides OEM support, competitive pricing, and reliable bulk supply for your global projects.