CW610N

CW610N, also known as Leaded Muntz Metal, is a leaded brass alloy widely used for its excellent machinability, good strength, and corrosion resistance. It is primarily a copper-zinc alloy with a small amount of lead that acts as a lubricant during machining.

Chemical Composition

• Copper (Cu): 59.00 – 60.50%

• Zinc (Zn): Balance (approx. 37.5 – 41.8%)

• Lead (Pb): 0.20 – 0.80%

• Tin (Sn): Up to 0.20%

• Iron (Fe): Up to 0.20%

• Aluminium (Al): Up to 0.05%

• Nickel (Ni): Up to 0.30%

• Other impurities: Up to 0.20%

Mechanical Properties (AS per Temper R410)

• Tensile Strength (UTS): Minimum 410 MPa (for rods 2-40 mm diameter)

• Proof Stress: Minimum 230 MPa

• Elongation: Minimum 12%

• Hardness: Varies based on form and temper

Physical Properties

• Density: 8.41 g/cm³ (0.304 lb/in³)

• Melting Point: Solidus approx. 1630°F (887°C), Liquidus approx. 1650°F (899°C)

• Electrical Conductivity: Approximately 28% IACS

• Thermal Conductivity: 71 BTU/(ft²·hr·°F)

• Coefficient of Thermal Expansion: 11.6 × 10⁻⁶ per °F

• Specific Heat Capacity: 0.09 BTU/lb/°F

Fabrication and Applications

• Excellent machinability due to lead content

• Good hot formability and fair cold workability

• Good soldering and brazing capabilities

• Limited welding compatibility (some methods not recommended)

• Typical uses: Builders hardware, plumbing fittings, condensers, heat exchanger tubes, and architectural components