C37000

C37000 is a leaded alpha-beta brass alloy, sometimes referred to as Free-Cutting Muntz Metal or CW607N, used extensively for forging and machining applications where moderate strength and good machinability are required.

Chemical Composition

• Copper (Cu): 59.0 – 62.0%

• Zinc (Zn): 36.0 – 40.2%

• Lead (Pb): 0.8 – 1.5%

• Iron (Fe): Up to 0.15%

• Remainder: Other minor elements up to 0.4%

Mechanical Properties

• Tensile Strength: Around 400 MPa (58 ksi)

• Yield Strength: Around 160 MPa (23 ksi)

• Elongation: Approximately 40%

• Hardness (Rockwell B): Around 45

Physical and Thermal Properties

• Density: 8.41 g/cm³

• Electrical Conductivity: 27% IACS

• Thermal Conductivity: 69 BTU/(ft²·hr·°F)

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

• Specific Heat: 0.09 BTU/lb/°F

Fabrication and Applications

• Excellent hot forming and forging characteristics

• Good machinability due to lead content

• Suitable for automotive and industrial components including screws, nuts, gears, and fittings

• Not recommended for welding by oxyacetylene or arc methods