LEADED BRASS

Metals

Brass
Bronze
17
18
19
20
21
22
23

DESCRIPTION 

 

CW621N
SPEC SHEET

CW621N is a lead free material which is however quite suitable for machining Due to its structural constitution. CW621N can be therefore used as a cost-effective Replacement for conventional lead-containing machining brass provided that it must not meet high requirements as regards mechanical properties and corrosion Resistance.

 
 

CHEMICAL COMPOSITION

ElementsMin (%)Max (%)
Cu55.5059.00
Pb0.200.80
Sn–0.30
Fe–0.30
Al0.050.50
Ni0.300.30
Total Others–0.20
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
 

TYPICAL USES

  • Builders Hardware
  • Consumer
  • Building
  • Industrial