Copper Nickel 70 / 30 Flanges

Crafted from a high-performance alloy containing 70% copper and 30% nickel, these flanges are further strengthened with small amounts of iron and manganese, which contribute to their exceptional corrosion resistance and mechanical durability. This metallurgical configuration provides exceptional resistance to seawater corrosion, biofouling, and stress corrosion cracking, making it particularly suitable for aggressive marine environments. The flanges offer robust performance in saline and brackish water applications due to the formation of a protective oxide film on the surface, which self-heals in the presence of oxygen. Additionally, Copper Nickel 70/30 exhibits superior thermal stability, excellent tensile strength, and low magnetic permeability, further adding to its utility in complex fluid handling systems.

From a manufacturing standpoint, Copper Nickel 70/30 flanges are available in various types including weld neck, slip-on, socket weld, blind, threaded, and lap joint flanges. These are produced in conformity with international standards such as ASME, ASTM, DIN, and EN specifications, ensuring compatibility across global infrastructure projects. The alloy offers good machinability and weldability, with a consistent grain structure that supports precision fabrication and long-term operational reliability. Its mechanical properties—such as a tensile strength of approximately 320 MPa and a yield strength of 125 MPa—allow it to maintain structural integrity under moderate pressure and temperature variations, which is critical for both onshore and offshore installations.

The flanges are also known for their excellent resistance to erosion and cavitation, particularly in high-velocity seawater systems. This makes them a preferred choice in applications involving fluctuating flow dynamics. With a melting point of around 1170°C and excellent creep resistance, 70/30 Copper Nickel flanges deliver reliable performance in thermally demanding environments. Their lifecycle durability reduces the need for frequent replacements, making them a cost-effective solution in terms of total ownership cost. The combination of metallurgical precision and application resilience positions these flanges as a technically superior choice for mission-critical systems in harsh environments.

Applications

Copper Nickel 70/30 flanges are widely utilized in environments where resistance to seawater and bio-corrosive agents is paramount. Their primary application lies in marine and naval engineering, where they are used in seawater piping systems, desalination plants, bilge and ballast systems, firewater systems, and heat exchangers. The alloy’s ability to resist microbial-induced corrosion (MIC) and scaling makes it ideal for use in environments where continuous contact with seawater or brine is unavoidable. These flanges are also extensively used in shipbuilding, particularly in the construction of underwater piping, cooling systems, and propulsion components where longevity and performance are crucial.

In the energy and power generation sector, Copper Nickel 70/30 flanges play a vital role in cooling water systems of thermal and nuclear power plants. They are used in condenser tubing, feedwater heaters, and auxiliary cooling circuits where their resistance to high-temperature oxidation and erosion enhances system reliability. Chemical processing units also benefit from the alloy’s resistance to acidic and alkaline solutions, particularly in areas where conventional stainless steel might corrode prematurely. Their application extends to HVAC systems, offshore platforms, and fire suppression systems, where safety and durability are non-negotiable.

Moreover, these flanges are integral to offshore oil and gas operations, where extreme operating conditions demand materials that can endure fluctuating pressure, salinity, and chemical exposure. The non-magnetic and spark-resistant nature of Copper Nickel 70/30 makes it an ideal material for precision applications such as instrumentation systems, control mechanisms, and fluid flow regulation in sensitive operational environments. They are also increasingly employed in renewable energy projects, such as ocean thermal energy conversion (OTEC) systems and floating solar platforms, where exposure to marine conditions is constant. The versatility of these flanges across such a wide spectrum of applications is a testament to their engineering excellence and material robustness.

Industry Use

Industries operating in coastal, offshore, and industrial environments rely heavily on Copper Nickel 70/30 flanges for their unmatched durability and corrosion resistance. In the maritime and shipbuilding industries, these flanges have become indispensable for constructing critical fluid systems that must perform reliably over long durations with minimal maintenance. Their widespread adoption in naval fleets, commercial vessels, and cargo ships underscores their strategic importance in enhancing operational uptime and safety in oceanic transportation.

In the oil and gas industry as especially across major energy-producing regions such as the United Arab Emirates (UAE), the Kingdom of Saudi Arabia (KSA), Kuwait, Qatar, Oman, Iran, and Iraq that Flanges made from the 70/30 copper-nickel alloy are widely favored in both upstream extraction and downstream processing activities due to their durability and resistance to harsh operating conditions. These countries, along with India, also utilize these flanges in refinery cooling systems, offshore extraction units, petrochemical pipelines, and LNG terminals, where exposure to saline water and harsh chemicals can compromise less durable materials. The ability of this alloy to function seamlessly under such aggressive conditions reduces system downtime and boosts asset longevity, thus supporting operational efficiency.

In infrastructure development and utility services, especially within desalination plants and water treatment facilities across the Middle East and South Asia, the reliability of Copper Nickel 70/30 flanges is pivotal. These regions prioritize water infrastructure resilience due to climatic conditions, and the alloy’s performance has been proven in thousands of installations. The increasing demand for long-lasting materials in environmentally sensitive and mission-critical operations continues to drive the adoption of these flanges in both public and private sector projects. With growing emphasis on sustainable engineering practices, the long service life, ease of maintenance, and recyclability of Copper Nickel 70/30 flanges make them a preferred choice for environmentally responsible infrastructure and industrial applications.

Our Copper Nickel 70 / 30 Flanges are used in a wide range of applications and various industries. Below are a few of them: