Main characteristics and application of C70600 tube sheet

C70600 is a 90/10 copper-nickel alloy (90% Cu, 10% Ni) with small additions of iron (Fe) and manganese (Mn) to enhance corrosion resistance. It is widely used in tube sheets, heat exchanger tubes, and other critical components in aggressive environments, particularly marine and industrial applications.

 (Conforms to ASTM B171 for copper-nickel alloy plate and sheet.)

(1) Corrosion Resistance - Superior seawater corrosion resistance, outperforming many stainless steels in marine environments due to: - Resistance to biofouling (barnacles, algae). - High resistance to pitting and crevice corrosion in saltwater. - Performs well in mild acidic/alkaline solutions but is not suitable for strong oxidizing acids (e.g., nitric acid). - Galvanic compatibility concerns: Avoid direct coupling with stainless steel or titanium without insulation to prevent galvanic corrosion.

(2) Mechanical Properties (Typical values, ASTM B171) - Tensile strength: ≥ 380 MPa - Yield strength (0.2% offset): ~150 MPa - Elongation: ~30% - Hardness: ~80 HRB

(3) Temperature Resistance - Recommended operating range: -196°C to 260°C - Short-term exposure up to 400°C is possible but may lead to oxidation and reduced strength. - For higher temperatures, C71500 (70/30 Cu-Ni) is preferred.

(4) Fabrication & Weldability - Excellent weldability (TIG, MIG, brazing). - Good formability (can be cold-worked or hot-formed). - Machinability: Fair (similar to other Cu-Ni alloys).

(5) Thermal & Electrical Conductivity - Thermal conductivity: ~50 W/m·K (lower than pure copper but sufficient for heat exchangers). - Electrical conductivity: ~9% IACS (used in some electrical applications). ---

(1) Marine & Offshore Engineering - Seawater cooling systems (condensers, heat exchangers). - Desalination plants (MSF, MED evaporators). - Shipbuilding (tube sheets, piping, pumps).

(2) Power Generation - Coastal/nuclear power plants (condenser tube sheets). - Offshore oil & gas platforms (heat exchangers).

(3) Chemical & Petrochemical - Brine handling, mild chemical processing. - Not recommended for strong acids/oxidizers. ---

C70600 tube sheets are a cost-effective, corrosion-resistant solution for seawater and mild chemical applications, particularly in marine engineering, power plants, and desalination. For higher temperatures or harsher conditions, C71500 (70/30 Cu-Ni) or titanium may be better alternatives.