Copper Alloy Low Fin Tube B111 C70600-O61 for Evaporator and Condensers

Copper Alloy Steel B111 C70600-O61 Base Tube

Copper Alloy Steel B111 C70600-O61 Low Fin Tube Features

1. Corrosion Resistance: Forms a dense Cu₂O-NiO film; resists seawater (up to 4.5 m/s flow), biofouling, stress-corrosion cracking, and erosion in brackish/marine environments.
2. Fabricability: O61 temper enables easy bending/flaring; welds well via TIG/MIG/brazing (use ERNiCu-7 filler); cold workable for shaping.
3. Heat Transfer: Good thermal conductivity (~50 W/(m·K)) suits heat exchangers/condensers.
4. Durability: Stable performance from -100°C to 200°C; long service life (20+ years) in seawater systems.

Copper Alloy Steel B111 C70600-O61 Low Fin Tube Key Applications

• Marine: Shipboard condensers, seawater cooling piping, offshore platform heat exchangers, desalination plants.
• Power Generation: Steam turbine condensers, power plant heat exchangers.
• Process Industries: Chemical plant tubular systems, pharmaceutical equipment handling corrosive fluids.
• Other: Brackish water piping, distiller tubing, evaporator tubes.

Copper Alloy Steel B111 C70600-O61 Low Fin Tube FAQ

What does O61 temper mean?

• Fully annealed (soft) condition for maximum ductility, critical for tube forming and flaring in heat exchanger/condenser assembly.

Can it handle high-velocity seawater?

• Yes—resists flow up to 4.5 m/s, better than pure copper or brass.

Recommended welding filler?

• Use ERNiCu-7 (AWS A5.7) for TIG/MIG; avoid high-iron fillers to preserve corrosion resistance.

Is it cost-competitive vs. stainless steel?

• Higher upfront cost but lower lifecycle cost due to longer service life and less maintenance in marine environments.

What is the max operating temperature?

• 200°C for long-term service; short-term exposure up to 400°C is acceptable.

Copper Alloy Steel B111 C70600-O61 Low Fin Tube Key Considerations

• Fabrication: Annealed O61 tubes require care to avoid overworking; cold forming may need re-annealing.
• Joining: Clean surfaces and proper shielding gas (argon) prevent oxidation during welding.
• Standards Compliance: Ensure conformance to ASTM B111 for dimensions, mechanicals, and corrosion performance.

Copper Alloy Low Fin Tube B111 C70600-O61 for Evaporator and Condensers

C70600-O61 is the go-to annealed CuNi tube for marine and power applications demanding corrosion resistance plus ductility. Its balanced properties make it reliable for critical seawater cooling and heat transfer systems.
As we have been in this area for more than 35 years, our copper tube manufacturing factory has the top technology and huge scale in China. We can produce base tubes of various diameters and wall thicknesses according to customer requirements. Our copper tubes have high strength and toughness for high pressure environments. At the same time, it can withstand certain shock and vibration to ensure the stability of the system.