Naval brass is a conventional copper-zinc-tin ternary alloy. Its typical Chinese standard grade HSn70-1 is equivalent to the international grade C44300. Named for its superior adaptability to harsh marine service conditions and extensive utilization in marine equipment, naval brass incorporates tin elements to enhance corrosion and erosion resistance compared with standard brass. Meanwhile, it retains favorable formability, thermal conductivity and mechanical stability, making it a multi-purpose special copper alloy for industrial applications.

    Naval brass (HSn70-1) features a well-proportioned chemical composition and stable comprehensive mechanical properties. With a tin content of approximately 1 wt%, the alloy effectively suppresses dezincification corrosion in saline and humid environments. In room-temperature flowing seawater, its annual corrosion rate is controlled below 0.02 mm, exhibiting significantly better seawater durability than ordinary brass. The material delivers a tensile strength of no less than 310 MPa and an elongation of over 38%, achieving an optimal combination of structural strength and ductility to resist brittle fracture and permanent deformation. This alloy supports conventional processing techniques including rolling, cutting, bending and welding with excellent hot and cold workability, and can be manufactured into plates, thin-walled tubes, precision bars and other profiles with high dimensional accuracy. In addition, its superior resistance to stress corrosion cracking enables stable structural performance under alternating fluid loads and long-term corrosive service conditions, which is suitable for long-cycle industrial operation.

    Marine and offshore engineering are the primary application scenarios for naval brass. Benefiting from its reliable seawater corrosion resistance, naval brass is widely utilized in the fabrication of marine seawater pipelines, condenser heat exchange tubes, marine valves, fasteners, propeller fittings and steering system components. It satisfies the operating requirements of underwater, semi-submerged and deck-mounted ship parts, and has become a staple structural material in the shipbuilding industry.

    In addition to marine facilities, naval brass has broad application prospects in various industrial fields. In seawater desalination, thermal power generation and nuclear power industries, naval brass tubes serve as core components of condensation and heat exchange systems. Their stable thermal conductivity and medium corrosion resistance ensure continuous and reliable equipment operation. In petrochemical and general machinery sectors, the alloy is used to produce pump bodies, bearing housings, fluid control components and other structural parts that require tolerance to mild corrosive media, adapting to humid, saline and weakly corrosive working environments.

    Thanks to its balanced comprehensive properties, mature processing technology and consistent service reliability, naval brass is widely applied in marine engineering, energy power and general machinery industries. As a cost-effective and highly applicable alloy for corrosive environments, it occupies an essential position in the field of special metallic materials.

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