CW509L

CW509L is a lead-free brass alloy also known as CZ109 or CuZn40, containing approximately 60% copper and 40% zinc, designed for good corrosion resistance and excellent hot and cold forming.

Chemical Composition

• Copper (Cu): 59.00% – 61.50%

• Zinc (Zn): Balance

• Lead (Pb): Up to 0.20%

• Iron (Fe): Up to 0.20%

• Tin (Sn): Up to 0.20%

• Nickel (Ni): Up to 0.30%

• Aluminium (Al): Up to 0.05%

• Other elements (total impurities): Up to 0.20%

Mechanical Properties (Temper R410)

• Tensile Strength: Minimum 410 MPa

• Proof Stress: Minimum 230 MPa

• Elongation: Minimum 10%

• Hardness (HRB): Minimum 35

Physical Properties

• Density: 8.39 g/cm³

• Melting Point: Approx. Solidus 1650°F, Liquidus 1660°F

• Electrical Conductivity: About 28% IACS

• Thermal Conductivity: 71 BTU/sq ft/ft/hr/°F (approx. 122 W/m·K)

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

Fabrication and Machinability

• Excellent hot working capacity

• Fair cold workability

• Good soldering and brazing capabilities

• Good oxyacetylene welding and spot welding; limited gas shielded arc welding

• Not recommended for coated metal arc and seam welding

• Machinability rating about 40% relative to standard free-cutting brass (CuZn39Pb3)

• Forgeability rating: 90

Typical Applications

• Heat exchanger and condenser tube plates

• Marine and offshore components

• Architectural and decorative trim

• Forgings and hot-stamped components

• Plumbing and valve parts requiring corrosion resistance with lead-free composition