CZ137

CZ137, a variety of engraving brass, belongs to the 60/40 alpha-beta brass category and features the addition of lead to enhance its free machining properties. It’s important to note that CZ137 should not be employed for acid etching work; instead, the single-phase alpha brasses are recommended for such applications.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu55.50Pb
Pb0.300.80
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 40 380 25
40 350 350 28
Hex (A/F) 6 40 380 25
40 75 350 28
Square (A/F) 6 40 380 25
40 75 350 28
PHYSICAL PROPERTIES
Electrical conductivity %IACS 31
Thermal conductivity W/(m·K) 139
Thermal expansion coefficient (0–300 °C) 10-6 /K 21.70
8.36 g/cm3 8.36 g/cm3
Modulus of elasticity 107 Gpa
FABRICATION PROPERTIES 
Machinability (CuZn39Pb3 = 100 %) 50%
Capacity for being cold worked poor
Capacity for being hot worked Excellent
Resistance welding (butt weld) Fair
Inert gas shielded arc welding Fair
Gas welding Fair
Hard soldering Excellent
Soft soldering Excellent
Melting range 870–900 °C
Hot working 650–750 °C
Soft annealing (1–3 h) 450–550 °C
Thermal stress relieving (1–3 h) 250–350 °C

CZ137

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