CZ134

CZ134 naval brass is a copper alloy known for its excellent combination of high ductility, good creep resistance, and high impact strength. It offers excellent electrical and thermal conductivity, making it widely used in marine hardware, screw machine products, valve stems, and other applications requiring hot forging, pressing, and machining.

Chemical Composition

• Copper (Cu): 59.00 – 62.00%

• Lead (Pb): 1.30 – 2.20%

• Tin (Sn): 0.50 – 1.00%

• Iron (Fe): Up to 0.10%

• Zinc (Zn): Remainder (balance)

• Total others (incl. Ni, Al, etc.): Up to 0.20%

Mechanical Properties (According to BS287, Temper M)

• Tensile Strength (UTS Minimum):

  • 400 MPa for round, hex, and square bars up to 18 mm diameter

  • 350 MPa for sizes from 18 to 40 mm

• Proof Stress (Min): 150-170 MPa depending on size

• Minimum Elongation: 15-20%

• Hardness: Typically around 70 HRB or as per form

Physical Properties

• Density: 8.44 g/cm³

• Melting Point: Solidus 1630°F, Liquidus 1650°F

• Electrical Conductivity: 26% IACS

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

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

• Modulus of Elasticity: 15,000 ksi

• Specific Heat Capacity: 0.09 BTU/lb/°F

Fabrication Properties

• Excellent soldering and good brazing

• Not recommended for oxyacetylene or arc welding; fair for butt welding

• Poor cold workability, good hot workability (forgeability rating 90)

• Machinability: approximately 70 (relative scale)