CW719R

CW719R is a naval brass alloy with a 60:40 copper-zinc ratio, enhanced with about 1% tin to significantly improve corrosion resistance, particularly against dezincification. This two-phase alpha-beta brass offers reasonably high strength but lower ductility than single-phase alpha brass alloys.

Chemical Composition

• Copper (Cu): 59.00 – 61.00%

• Tin (Sn): 0.50 – 1.00%

• Lead (Pb): Up to 0.20%

• Iron (Fe): Up to 0.10%

• Nickel (Ni): Up to 0.20%

• Zinc (Zn): Balance (Remainder)

• Total Others: Up to 0.50%

Mechanical Properties (per EN 12165, Temper H080)

• Hardness: 80 – 150 HRB depending on shape and size

• Melting Point: Solidus ~1630°F (887°C), Liquidus ~1650°F (899°C)

• Specific Gravity: 8.41

• Electrical Conductivity: 26% IACS

• Modulus of Elasticity (Tension): 15,000 ksi

• Thermal Conductivity: 67 BTU/(ft²·hr·°F)

• Coefficient of Thermal Expansion: 11.8 x 10⁻⁶ per °F

Fabrication Properties

• Excellent soldering and brazing

• Good oxyacetylene welding and spot welding

• Fair gas shielded arc and seam welding

• Not recommended for coated metal arc welding

• Fair cold workability and excellent hot forgeability (forgeability rating 90)

• Low machinability rating (~30 compared to CuZn39Pb3 being 100)

Applications

• Structural components exposed to seawater

• Forged parts such as valves, heat exchangers, and condensers

• Marine hardware