C26000

C26000 is a yellow brass alloy also known as Cartridge Brass or CW505L (CuZn30), consisting approximately of 68.5% to 71.5% copper and 28.1% to 31.5% zinc, with trace elements like lead and iron in small amounts.

Chemical Composition

• Copper (Cu): 68.5% – 71.5%

• Zinc (Zn): 28.1% – 31.5%

• Lead (Pb): Up to 0.07%

• Iron (Fe): Up to 0.05%

• Bismuth (Bi): Up to 0.0059% (added for machinability)

• Residuals: Up to 0.30%

Mechanical Properties

• Tensile Strength: Typically 320 – 680 MPa (varies by temper)

• Proof Stress: 110 – 570 MPa

• Elongation at Break: 2.5% to 66% (varies significantly by temper)

• Rockwell B Hardness: 53 to 93

Physical Properties

• Density: Approximately 8.53 g/cm³

• Melting Point: Liquidus 954°C (1750°F)

• Electrical Conductivity: Around 28% IACS

• Thermal Conductivity: About 70 BTU/sq ft/ft/hr/°F

• Coefficient of Thermal Expansion: 11.1 x 10⁻⁶ per °F (68-572°F)

Fabrication and Machinability

• Known for excellent cold forming (drawing, bending, forming, deep drawing)

• Good corrosion resistance and weathering properties

• Suitable for soldering, brazing, and welding (oxyacetylene preferred)

• Machinability improved by bismuth addition, safer and eco-friendly alternative to leaded brasses

Applications

• Electrical terminals, lamp fittings, locks, and door handles

• Grillwork, architectural hardware, and fasteners

• Radiator cores and tanks, cartridge cases

• Pumps, valves, and mechanical components