CW722R

CW722R is categorized as a duplex high tensile brass alloy with a deliberately limited aluminum content, a feature designed to improve its soldering and brazing capabilities. Occasionally likened to manganese bronze, CW722R distinguishes itself by incorporating additional elements such as iron, tin, and manganese. These additives contribute to enhancing both the physical and mechanical properties of the alloy, making it well-suited for various applications.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu56.5058.50
Pb0.801.60
Al0.10
Fe0.201.20
Mn0.801.80
Ni0.30
Sn0.201.00
Total others0.30
ZnRemainder

 

MECHANICAL PROPERTIES ACCORDING TO EN12164 CW722R (AS PER TEMPER R440)
Range (mm) From To UTS Min (N/mm²) PS Min (N/mm²) Elongation Min (%) Hardness Min Hardness Max
Round (Dia)407544020018
Hex (a/F)356044020018
Square (A/F)356044020018
Rectangle (Thickness)405044020018
PHYSICAL PROPERTIES
Melting Point940°C
Density 8.42g/cm³
Specific Heat380 J/Kg°K
Thermal conductivity (RT)88 W/m°K
Thermal expansion coefficient (20-200°C)20 x 10-6
Electrical conductivity18% IACS
Electrical Resistivity0.082 ohm mm²/m
FABRICATION PROPERTIES
Hot Working Temperature Range700-750°C
Hot FormabilityVery Good
Cold FormabilityPoor
Machinability rating (free cutting brass = 100)75%
Annealing Temp. Range425-600°C
Stress Relieving Temp. Range225-350°C
SolderingVery Good
BrazingVery Good
Oxy-acetylene weldingNot Recommended
Gas-shielded arc weldingNot Recommended
Resistance welding: Spot and SeamNot Recommended
ButtFair

CW722R

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