Overview
Naval brass (C46400) is a copper-zinc-tin alloy specifically formulated for marine environments. Originally developed for shipbuilding applications, it contains approximately 60% copper, 39% zinc, and 1% tin, with trace amounts of lead for machinability. The tin addition significantly improves corrosion resistance in seawater compared to standard brass alloys. This material is recognized by multiple international standards including ASTM B21 and MIL-B-16444, ensuring consistent quality for critical marine components.
Physical and Chemical Properties
Naval brass exhibits a tensile strength of 60-75 ksi (414-517 MPa) in annealed condition, increasing to 90 ksi (620 MPa) when cold worked. Its corrosion resistance stems from the formation of a protective oxide layer when exposed to seawater, with the tin content specifically inhibiting dezincification. The alloy maintains good thermal conductivity (~100 W/m·K) and electrical conductivity (~28% IACS), allowing its use in some marine electrical applications. Its machinability rating is approximately 30% of free-cutting brass, requiring appropriate tooling and lubricants during fabrication.
Main Applications
Primary applications focus on marine systems where saltwater corrosion resistance is critical. Common uses include propeller shafts, marine hardware (cleats, chocks), pump components, and heat exchanger tubes. The alloy's combination of strength and corrosion resistance makes it ideal for these demanding applications. Beyond marine use, naval brass serves in power plant condensers, desalination equipment, and coastal architectural elements. Its golden color also makes it popular for decorative marine fixtures that require both aesthetics and durability in harsh environments.
Safety and Storage
As a solid metal alloy, naval brass presents minimal health risks during normal handling. However, machining operations require dust control measures as brass fumes may cause metal fume fever. Proper ventilation and PPE (respirators, eye protection) are recommended during fabrication. Storage should prevent contact with ammonia compounds or strong acids that could cause stress corrosion cracking. Bulk material is typically supplied in dry, climate-controlled warehouses with palletized storage for rods, bars, and plates to prevent deformation.
B2B Procurement Guide
When sourcing naval brass, specify the required form (rod, plate, tube), dimensions, and applicable standards. Marine-grade purchases should always reference ASTM B21 or equivalent military specifications. Lead-free variants are available for applications with strict environmental regulations. Quality verification should include mill test reports for chemical composition and mechanical properties. For large projects, consider auditing supplier facilities to confirm proper material segregation and traceability systems. Minimum order quantities typically range from 500-1000 lbs for standard forms.
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