B111 C71500 for the heat exchange requirements of condenser tubes

C71500 Copper Nickel Tubes PDF

C71500 Copper Nickel Size & Price PDF

B111  C71500 alloy is typically composed of 70% copper and 30% nickel, with small amounts of iron, manganese, and other elements added. Its density is approximately 8.94 g/cm³, ensuring structural strength while maintaining a moderate weight. It has a melting point of 1170-1240°C, exhibiting structural stability at high temperatures and resisting deformation. Its thermal conductivity is approximately 29 W/(m·K), lower than pure copper, but sufficient for the heat exchange requirements of condenser tubes. It has a tensile strength of 480-620 MPa, a hardness of 100-150 HB, and a shear strength of approximately 320 MPa. It possesses good machinability and formability, and exhibits excellent material stability under mechanical stress.

In a 3.5% NaCl solution, the annual corrosion rate is ≤0.02 mm/a (ASTM G48 standard), and the critical pitting temperature (CPT) reaches 75°C. Dynamic seawater tests (flow rate 2.5 m/s, 30℃) showed a weight loss of only 0.15 mg/cm² after 1000 hours. Electrochemical tests indicated that the self-corrosion potential remained stable at -0.25 V (vsSCE), and the passivation current density was as low as 0.8 μA/cm², significantly superior to H62 brass.

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1. Welding: Prefer TIG or laser welding to minimize heat-affected zone brittleness.

2. Annealing: Post-cold working, anneal at 650-750°C; hot working temperature range: 900-1050°C.

3. Machining: Cutting speed ≤50 m/min; use carbide tools with oil-based coolant.

Q: What is the difference between C71500 and C70600 (90/10 CuNi)?

A: The primary difference is the nickel content (30% vs. 10%). C71500 offers superior corrosion resistance, higher strength, and better erosion-corrosion resistance than C70600, making it suitable for more demanding applications.

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: Why is C71500 so resistant to seawater corrosion?

A: It forms a tight, adherent, and protective surface oxide film that is highly resistant to various forms of corrosion, including impingement attack, crevice corrosion, and stress corrosion cracking in marine environments.

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.

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

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