CZ112

CZ112, also known as CW712R, is a naval brass alloy with approximately 60% copper, 39% zinc, and 1% tin. The tin addition significantly improves corrosion resistance, especially in marine environments, and also increases the alloy's strength and durability through a harder and stronger duplex (alpha-beta) structure.

Chemical Composition

• Copper (Cu): 61.00 – 63.50%

• Tin (Sn): 1.00 – 1.40%

• Lead (Pb): 0.20% (approximate, some grades may be lead-free or have minimal lead)

• Zinc (Zn): Balance

• Other impurities: Up to 0.70%

Mechanical and Physical Properties

• Tensile Strength: Around 350 to 400 MPa, depending on size and temper

• Elongation: Around 15 – 20%

• Hardness: Typically 80-150 HV

• Density: Approximately 8.4 g/cm³

• Melting Point: Liquidus around 1650°F (900°C), Solidus around 1630°F (887°C)

• Electrical Conductivity: 26% IACS

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

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

Fabrication and Application

• Excellent hot formability and fair cold formability

• Machinability rating around 30% compared to free cutting brass

• Widely used in marine components, heat exchanger tube plates, fasteners, rivets, valve parts, and general machined components

• Maintains good mechanical properties even at cryogenic temperatures