CW621N

CW621N is a lead-free material that is well-suited for machining due to its structural composition. It can serve as a cost-effective alternative to traditional lead-containing machining brass, as long as it doesn’t need to meet stringent mechanical property and corrosion resistance requirements.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu55.5059.00
Pb0.200.80
Sn0.30
Fe0.30
Al0.050.50
Ni0.300.30
Total Others0.20
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO BS2874 (AS PER TEMPER M)
No Mechanical properties for this alloy. Mechanical properties as agreed between punchers and supplier.
PHYSICAL PROPERTIES
Electrical conductivity %IACS31
Thermal conductivity W/(m·K)139
Thermal expansion coefficient (0–300 °C) 10-6 /K 21.70
Density8.41 g/cm3
Modulus of elasticity107 Gpa
FABRICATION PROPERTIES 
Machinability (CuZn39Pb3 = 100 %)60%
Capacity for being cold workedPoor
Capacity for being hot workedExcellent
Resistance welding (butt weld)Good
Inert gas shielded arc weldingFair
Gas weldingFair
Hard solderingGood
Soft solderingExcellent
Melting range870–900 °C
Hot working650–750 °C
Soft annealing  (1–3 h)450–550 °C
Thermal stress relieving (1–3 h)250–350 °C

CW621N

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