Naval Brass


Naval Brass


  • JIS H3250 C4641
  • ASTM B21 C46400


  • Used on parts where high degree of corrosion resistance to seawater is required.
  • The copper-zinc allow with tin, combines good mechanical strength with the ability to resist corrosion by the sea and many natural waters.
  • This allow is extensively used in the manufacture of heat exchanges of tube sheets and plates, and in the extruded form for propeller shafting, valves, spindles and general marine hardware.


Naval brass is a type of brass alloy renowned for its exceptional corrosion resistance, strength, and durability, making it particularly suitable for marine applications. Composed primarily of copper, zinc, and sometimes tin, naval brass offers a unique combination of properties that make it indispensable in maritime engineering. Here's a detailed write-up on naval brass alloy:


Naval brass typically consists of approximately 60-68% copper (Cu), 30-39% zinc (Zn), and trace amounts of other elements such as tin (Sn), iron (Fe), and lead (Pb). The addition of tin enhances the alloy's corrosion resistance, while zinc provides strength and hardness. The exact composition may vary depending on specific requirements and standards.


  1. Corrosion Resistance: Naval brass is renowned for its excellent corrosion resistance, particularly in marine environments where exposure to saltwater, moisture, and atmospheric conditions is prevalent. The inclusion of tin in the alloy forms a protective patina on the surface, which helps prevent corrosion and maintains the integrity of the material over extended periods.
  2. Strength and Toughness: Naval brass offers a balance of strength and toughness, making it suitable for structural applications in marine engineering. It possesses sufficient strength to withstand high loads and stresses encountered in marine environments while remaining tough enough to resist fractures and fatigue failure.
  3. Antifouling Properties: Due to its copper content, naval brass exhibits inherent antifouling properties, which help prevent the growth of marine organisms such as barnacles, algae, and mollusks on submerged surfaces. This property is particularly advantageous for ship hulls, propellers, and other underwater components, reducing maintenance requirements and improving operational efficiency.
  4. Machinability: Despite its robustness, naval brass is relatively easy to machine and fabricate using conventional methods, including cutting, drilling, milling, and welding. Its machinability allows for the efficient production of complex components and structures required in marine engineering applications.
  5. Thermal Conductivity: Naval brass possesses good thermal conductivity, enabling efficient heat transfer and dissipation. This property is beneficial in applications where thermal management is crucial, such as heat exchangers, condensers, and other heat transfer equipment used in maritime systems.
  6. Electrical Conductivity: Like other brass alloys, naval brass exhibits good electrical conductivity, making it suitable for electrical and electronic applications onboard ships and maritime installations. It is commonly used in electrical connectors, terminals, and grounding systems where reliable conductivity is essential.


  1. Shipbuilding: Naval brass finds extensive use in shipbuilding and marine construction for various components and structures, including hulls, propellers, shafts, valves, fasteners, and fittings. Its corrosion resistance and mechanical properties make it ideal for both surface and submerged applications in seawater environments.
  2. Marine Hardware: It is used in the fabrication of marine hardware such as cleats, hinges, latches, and portholes due to its durability, corrosion resistance, and aesthetic appeal. Naval brass hardware withstands exposure to harsh marine conditions while maintaining its functionality and appearance.
  3. Offshore Structures: Naval brass is employed in offshore structures and oil platforms for components subjected to corrosive seawater environments, such as pipes, fittings, flanges, and connectors. Its resistance to corrosion and mechanical strength contribute to the reliability and longevity of offshore installations.
  4. Nautical Instruments: Brass alloys, including naval brass, are used in the manufacture of nautical instruments, navigational equipment, and marine instrumentation due to their durability, corrosion resistance, and aesthetic qualities. They are commonly found in compass housings, sextants, barometers, and ship's clocks.


Naval brass alloy is a versatile material widely utilized in marine engineering for its excellent corrosion resistance, strength, durability, and machinability. Whether in shipbuilding, marine hardware, offshore structures, or nautical instruments, naval brass plays a crucial role in ensuring the reliability, longevity, and performance of maritime systems and installations. Its unique combination of properties makes it a preferred choice for applications requiring robustness, resistance to corrosion, and suitability for marine environments.

  • Round Bar / Rod
  • Flat Bar / Plate
  • Cu: 61-64%
  • Pb: 0.3% max
  • Fe: 0.2% max
  • Sn: 0.7-1.5%
  • Zn: Remainder %
  • Tensile Strength: > 365N/mm2
  • Elongation: >20%
  • Typical Hardness: 140 HB
  • 0.1% Proof Stress: 12 Tons/Inch2

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