C27400 is a popular yellow brass alloy, also known as cartridge brass, characterised by a copper content of approximately 61-64% and zinc as the balance. It is widely used for its excellent ductility, machinability, corrosion resistance, and good cold formability.
Chemical Composition
Copper (Cu): 61.0% - 64.0%
Zinc (Zn): Balance (~36-39%)
Lead (Pb): Up to 0.09%
Iron (Fe): Up to 0.05%
Other elements: Up to 0.30%
Mechanical Properties
Tensile Strength: Approximately 365 - 650 MPa (depending on form and temper)
Proof Stress: Minimum about 195 - 230 MPa (varies by size and temper)
Elongation: 10% - 15% or higher, depending on temper
Hardness (HRB): Typically between 28 - 33
Physical Properties
Density: About 8.44 g/cm³
Melting Point: Around 1680°F (910°C)
Electrical Conductivity: Approximately 27.6% IACS
Thermal Conductivity: Around 67 BTU/sq ft/ft/hr/°F
Coefficient of Thermal Expansion: 11.4 x 10⁻⁶ per °F
Fabrication and Machinability
Excellent cold forming properties, such as drawing, bending, and forming
Good machinability (rated about 35 compared to free cutting brass, Alloy 360 rated 100)
Excellent soldering and brazing capabilities
Suitable for various welding methods, including oxyacetylene and spot welding
Poor hot forming capacity, but excellent for cold work
Typical Applications
Fasteners, fittings, and valves
Plumbing hardware, electrical connectors, and architectural components
Tubes, rods, wires, and various cold-formed products