C27400

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