C47000

C47000 is a naval brass alloy, typically a 60/40 copper-zinc alloy with about 1% tin added to enhance corrosion resistance, especially against dezincification. It is a two-phase alpha-beta brass, which gives it higher strength but somewhat lower ductility compared to single-phase alpha brasses. The tin addition improves corrosion resistance and makes it ideal for marine and structural applications, particularly where exposure to seawater is expected.

Chemical Composition

• Copper (Cu): 57.00 – 61.00%

• Zinc (Zn): Balance (approx. 39%)

• Tin (Sn): 0.25 – 1.00%

• Lead (Pb): Up to 0.50%

• Aluminium (Al): Trace

• Total Other Elements: Up to 0.40%

Mechanical Properties

• Tensile Strength: Varies, typically higher than 60/40 brass without tin

• Ductility: Lower than single-phase alpha brasses

• Forgeability: Excellent

• Machinability: Low (approx. 30 relative to leaded brasses)

Physical Properties

• Density: 8.9 g/cm³

• Melting Range: Solidus ~ 880°C, Liquidus ~ 900°C

• Thermal and Electrical Conductivity: Moderate

Fabrication and Uses

• Excellent for forging, hot working

• Excellent soldering and brazing

• Fair to good welding (varies)

• Typical uses include fasteners, marine hardware, structural components, and corrosion-resistant industrial parts