C70600 copper tube production process

The production process of C70600 copper tube involves multiple precision steps, mainly including the following processes:

Material preparation: Select C70600 copper-nickel alloy billets that meet the standards to ensure that their chemical composition (such as 90% copper, 10% nickel and trace iron, manganese, etc.) meets the standards.

Smelting and casting: The cathode copper and alloying elements (such as nickel and iron) are smelted to about 1200°C in an industrial frequency furnace, and then horizontal continuous casting is performed to form a tube billet.

Hot working: The tube billet is hot rolled or forged, and the initial shape and size are adjusted by extrusion or rolling.

Cold forming: The wall thickness and diameter of the tube are refined by cold drawing, cold drawing or planetary rolling. Some processes require drawing oil lubrication to reduce friction.

Welding and forming: TIG (argon arc welding), MIG (gas shielded welding) or SAW (submerged arc welding) are selected for welding according to needs, which is suitable for pipes of different sizes. Cold bending or hot bending is required after welding to meet specific shape requirements.

Heat treatment: Anneal the pipe after welding or cold processing (such as low temperature annealing) to eliminate internal stress and improve material toughness.

Surface treatment: Enhance surface corrosion resistance through pickling, passivation or polishing process, and some application scenarios require coating treatment.

Quality inspection: Including chemical composition analysis, mechanical property testing (such as tensile strength ≥ 275-380MPa), non-destructive testing, etc., to ensure that the product meets ASTM and other standards.

Product advantages of C70600 copper pipe

Excellent corrosion resistance:

Excellent performance in seawater, salt water and high flow rate (up to 4.5 m/s) environment, and its resistance to uniform corrosion and local corrosion is significantly better than ordinary steel and other copper alloys (such as C68700).

The dense oxide film formed on the surface can resist the adhesion of acids, alkalis, solvents and biological fouling, and is suitable for marine engineering, chemical equipment and seawater desalination systems.

Excellent mechanical properties:

Tensile strength ≥275-550MPa, elongation ≥28-30%, high hardness and good wear resistance, can withstand high pressure, high temperature (melting point 1149-1243°C) and complex stress environment.

Elastic modulus 140 GPa, thermal expansion coefficient 13.9×10⁻⁶ m/(m·K), strong thermal stability, suitable for heat exchange equipment.

Excellent processing and welding performance:

Outstanding cold and hot processing performance, can be formed by cold drawing, rolling, forging and other processes, and easy to weld (TIG/MIG/SAW), with high weld strength and good sealing.

High plasticity, can be made into complex shapes of pipes, elbows, flanges and other components.

Multifunctional physical properties:

Excellent thermal conductivity (thermal conductivity 50.2 W/(m·K)), suitable for heat exchange equipment such as condensers and heat exchangers.

Good electrical conductivity (resistivity 12.5nΩ·m), can be used in electrical components and ship cable systems.

Non-magnetic to weakly magnetic, meet the needs of special environments (such as electronic equipment).

Additional advantages:

Antibacterial properties: The surface can inhibit bacterial growth, suitable for medical devices and food industries.

Economical: Compared with titanium alloy or stainless steel, it has lower cost and longer maintenance cycle, especially suitable for large-scale applications such as offshore platforms and petrochemicals.