CW718R

CW718 is a specialized brass alloy known for its moderate strength, remarkable resistance to atmospheric corrosion, and favorable sliding properties, thanks to the presence of manganese and aluminum as alloying elements. CW718R, a variant of this alloy, serves as a standard bearing material specifically designed for applications with medium-level loads within the realm of machine construction.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu57.0059.00
Pb0.200.80
Al0.301.30
Fe0.50
Mn0.801.80
Ni0.50
Sn0.50
Si0.50
Total others0.30
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO EN12165 CW718 (AS PER TEMPER H130)
Range (mm) From To UTS Min (N/mm²) PS Min (N/mm²) Elongation Min (%) Hardness Min (HB) Hardness Max
Round (Dia)675130
Hex (A/F)670130
Square (A/F)660130
Rectangle (Thickness)650130
PHYSICAL PROPERTIES
Electrical conductivity7.8 %IACS
Thermal conductivity63 W/(m•K)
Thermal expansion coefficient (0–300 °C)21.1 10-6/K
Density8.24 g/cm³
Modulus of elasticity93 Gpa
FABRICATION PROPERTIES
Machinability (CuZn39Pb3 = 100 %)40%
Capacity for being cold workedPoor
Capacity for being hot workedgood
Resistance welding (butt weld)good
Inert gas shielded arc weldingfair
Gas weldingPoor
Hard solderingfair
Soft solderingPoor
Melting range860-910 °C
Hot working600–700 °C
Soft annealing500–650 °C (1–3 hr)
Thermal stress relieving300–430 °C (1-3 hr)

CW718R

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