ASTM B111 C44300 O61 Annealed Copper-Alloy Seamless Tube, Harsh working conditions

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ASTM B111 C44300 O61 Annealed Copper-Alloy Seamless Tube, Harsh working conditions

ASTM B111 C44300 O61 Annealed Copper-Alloy Seamless Tube refer to seamless tube made from Admiralty Brass (C44300), manufactured in accordance with ASTM B111 standards and delivered in O61 annealed condition. This alloy is a copper-zinc alloy with a typical composition of approximately 71% copper, 28% zinc, and 1% tin, plus trace amounts of arsenic, antimony, or phosphorus to inhibit dezincification. Its most notable characteristic is exceptional resistance to seawater corrosion. The O61 annealing process provides high ductility and excellent workability, making these tubes widely used in condensers, heat exchangers, and marine piping systems for shipbuilding, power generation, and chemical processing industries.

1.Chemical & Mechanical Properties

Mechanical Properties

2. Key Adventages

• Exceptional Resistance to Seawater Corrosion

As "Admiralty Brass," its composition (with ~1% Tin and trace Arsenic/Antimony) effectively resists dezincification and impingement corrosion caused by seawater, making it an ideal choice for marine environments.

• Excellent Anti-Biofouling Properties

The release of copper ions provides natural antimicrobial and anti-fouling properties, effectively inhibiting the attachment and growth of marine organisms (e.g., barnacles, algae) on the pipe interior, reducing maintenance.

• Good Machinability and Formability

The O61 (Annealed) condition offers high plasticity and a soft microstructure, facilitating on-site operations such as bending, flaring, and flanging for easy installation.

• High Thermal Conductivity

It retains the inherent high thermal conductivity of copper alloys, enabling efficient heat transfer when used as heat exchanger tubes, thereby improving energy efficiency.

• Robust Seamless Structure

The seamless manufacturing process ensures structural continuity and uniformity in the circumferential direction, resulting in higher pressure-withstanding capability and reliability, with no risk of weld seam corrosion.

3. Key Applications

• Power Industry: Condensers, vacuum tubes, heat exchangers
• Shipbuilding and Marine Engineering: Seawater cooling pipes, piping systems, heat exchangers
• Chemical and Petrochemical Industry: Cooling water pipes in key locations

4. Test

• Pitting Tests
• Intergranular Corrosion Test
• Chemical Analysis
• Hardness Test

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