C2800

C2800 appears to be a typographical variation of C28000, which is a well-known yellow brass alloy also called Muntz Metal or CuZn40.

Chemical Composition

• Copper (Cu): 59.0% – 63.0%

• Zinc (Zn): 36.3% – 41.0%

• Lead (Pb): Up to 0.30%

• Iron (Fe): Up to 0.07%

• Residuals: Up to 0.30%

Mechanical Properties

• Tensile Strength: 400 to 485 MPa

• Elongation: Typically up to 25%

• Hardness: About 52 to 80 HRB (varies with form and temper)

Physical Properties

• Density: 8.39 g/cm³

• Melting range: Solidus 1650°F, Liquidus 1660°F

• Electrical Conductivity: Around 28% IACS

• Thermal Conductivity: About 71 BTU/sq ft/ft/hr/°F

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

Fabrication

• Excellent for soldering and brazing

• Good welding capabilities, except for coated metal arc welding

• Fair cold working, excellent hot forming capacity

• Machinability rating around 40% relative to free-cutting brasses

Typical Uses

• Architectural hardware

• Fasteners and industrial parts

• Plumbing fittings, valves, and pumps

• Decorative applications and mechanical parts