ASME SB111 C71500 CuNi 70/30 Seamless Tube Heat Exchanger Tubing Anti-Corrosion Pipe

1.Product Description

Copper-nickel alloy tubes are engineering-grade tubing based on copper with nickel as the primary alloying element (content 5%~30%). The most widely used grades are C70600 (90-10, ~10% Ni) and C71500 (70-30, ~30% Ni), with small but critical additions of iron and manganese for micro-alloying strengthening. Manufactured via extrusion combined with cold-drawing or cold-rolling processes, these tubes offer high dimensional precision and smooth internal/external surfaces. The microstructure is a stable single-phase face-centered cubic solid solution, free from phase embrittlement over a broad temperature range. Available in seamless (ASTM B466) and longitudinally welded (ASTM B467) forms, both are suitable for pressurized fluid service.

2.Product Applications

• Marine & Offshore Engineering: Central coolers, plate heat exchanger bundles, ballast water treatment systems, and stern tube cooling lines on ships.

• Power & Energy: Steam turbine condensers, auxiliary coolers, and fin-tube base pipes in thermal and nuclear power plants.

• Desalination & Chemical Processing: Heating section tube bundles in MSF plants, evaporator tubes in MED units, and brine-resistant piping in salt and alkali industries.

• Oil & Gas Offshore: Platform firewater ring mains, riser anti-corrosion sheathing, and subsea pipeline anode connection tubes.

• General Industrial Fluids: Pipelines for high-purity water, organic solvents, and mild acidic media, as well as pneumatic brake tubing for vehicles.

3.Product Advantages

• Superior erosion-corrosion resistance: At seawater flow velocities up to 3–5 m/s, the surface protective film remains stable, with impingement resistance far exceeding that of ordinary brass and stainless steel.

• Natural biofouling resistance & low maintenance: Continuous controlled release of copper ions effectively inhibits algae and barnacle attachment, drastically reducing system downtime for cleaning.

• Well-balanced mechanical properties: Tensile strength ranges from 275 to 345 MPa, with elongation ≥25%, offering excellent strength-toughness matching, and hardness levels can be adjusted via cold working.

• Reliable joining & forming: Compatible with oxy-acetylene welding, TIG welding, brazing, and soldering. Minimum bending radius can reach 1.5D without cracking, and tube ends support flaring and beading.

• Outstanding life-cycle economy: In seawater systems with a 25-year design life, corrosion allowance is significantly lower than carbon steel, and the material is 100% recyclable.

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​4.Key Product Specifications

FAQ

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2.How long is your delivery time? Generally it is 5-10 days if the goods are in stock. or it is 15-20 days if the goods are not in stock, it is according to quantity.

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