CZ128

CZ128 constitutes a machining brass that adeptly harmonizes the divergent material characteristics of machining and cold working. As a result, this material has firmly established itself as the prevailing standard alloy for machining and cold working applications across a multitude of industries.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu58.5061.00
Pb1.502.50
Fe0.20
Total Others0.50
ZnRemainder

 

MECHANICAL PROPERTIES ACCORDING TO BS2874 (AS PER TEMPER M)
Range (mm) From To UTS Min (N/mm²) PS Min Elongation Min (%) Hardness Min Hardness Max
Round (Dia) 6 18 380 22
18 40 380 22
40 75 350 25
Hex (A/F) 6 18 380 22
18 40 380 22
40 70 350 25
Square (A/F) 6 18 380 22
18 40 380 22
40 60 350 25
Rectangle (Thickness) 6 18 380 22
18 40 380 22
40 50 350 25
PHYSICAL PROPERTIES
Density8.44 g/cm³
Electrical Conductivity % IACS at 68°F24
Thermal Conductivity Btu/ sq ft/ ft hr/ °F at 68°F109 W/m.K
Thermal expansion coefficient20.4 10-6/K
Modulus of Elasticity102 Gpa
FABRICATION PROPERTIES
Machinability (CuZn39Pb3 = 100 %)90%
Capacity for being cold workedfair
Capacity for being hot workedexcellent
Resistance welding (butt weld)good
Inert gas shielded arc weldingpoor
Gas weldingPoor
Hard solderingfair
Soft solderingexcellent
Melting range895-900 °C
Hot working650-750 °C
Soft annealing450-650 °C (1–3 hr)
Thermal stress relieving200-300 °C (1-3 hr)

CZ128

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