CW712R is a naval brass alloy, also known by the designation CZ112. It is an alpha-beta brass with about 60% copper, 39% zinc, and approximately 1% tin, giving it enhanced corrosion resistance, especially in marine environments. The presence of tin improves mechanical strength and durability due to a harder duplex microstructure.
Chemical Composition
Copper (Cu): 61.00 – 63.50%
Tin (Sn): 1.00 – 1.40%
Lead (Pb): Approximately 0.20%
Zinc (Zn): Remainder
Iron (Fe) and other impurities: Up to 0.30%
Mechanical Properties
Tensile Strength: Typically 350 to 400 MPa, depending on shape and temper
Elongation: 15 – 20%
Hardness: Generally between 80 – 150 HV
Physical Properties
Density: Approximately 8.4 g/cm³
Melting Point: Around 1640°F (890°C)
Electrical Conductivity: About 26% IACS
Thermal Conductivity: Approximately 67 BTU/(ft²·hr·°F)
Thermal Expansion Coefficient: 11.8 x 10⁻⁶ /°F
Fabrication and Applications
Excellent hot formability and fair cold formability
Good corrosion resistance in seawater and marine atmospheres
Used for marine hardware, fasteners, valve components, and heat exchanger tube plates