C48200

C48200, also known as Medium Leaded Naval Brass, is a copper-zinc-tin alloy with approximately 1% tin added for corrosion resistance and about 0.4 – 1.0% lead to improve machinability. The alloy has a 60:40 copper to zinc ratio and is widely used in marine and industrial applications requiring good strength and corrosion resistance.

Chemical Composition

• Copper (Cu): 59.0 – 62.0%

• Zinc (Zn): Balance (approx. 38%)

• Tin (Sn): 0.5 – 1.0%

• Lead (Pb): 0.4 – 1.0%

• Iron (Fe): Up to 0.1%

• Others: Up to 0.4%

Mechanical Properties

• Tensile Strength (UTS): Approx. 370 – 415 MPa

• Proof Stress: Approx. 170 – 185 MPa

• Elongation: 18 – 20%

• Hardness: 60 – 85 HRB, depending on form and size

Physical Properties

• Density: 8.44 g/cm³

• Melting Range: Solidus ~1630°F (888°C), Liquidus ~1650°F (899°C)

• Electrical Conductivity: 26% IACS

• Thermal Conductivity: About 67 BTU/(ft²·hr·°F)

• Coefficient of Thermal Expansion: 11.8 × 10⁻⁶ per °F

Fabrication and Uses

• Excellent soldering and good brazing

• Welding is generally not recommended except for butt welding

• Poor cold workability but good hot workability

• Applications include marine hardware, screw machine parts, and valve stems