CW712R

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