CW707R

CW707R is a brass alloy designed to resist dezincification while maintaining superb cold working characteristics and a pure α-structure. It’s particularly well-suited for applications in warm, acidic waters. Additionally, CW707R can be effectively employed in processes like coining, riveting, crimping, flanging, cold extrusion, and other cold working operations.

CHEMICAL COMPOSITION
ElementsMin (%)Max (%)
Cu68.5071.50
Pb0.07
Fe0.05
As0.020.06
Total Others0.20
ZnRemainder
MECHANICAL PROPERTIES ACCORDING TO EN12451 (AS PER TEMPER R340)
Range (mm) From To UTS Min (MPa) PS Min (MPa) Elongation Min (%) Hardness Min Hardness Max
Round (Dia) 1.5 75 340 130 45
Hex (A/F) 3 70 340 130 45
Square (A/F) 3 60 340 130 45
PHYSICAL PROPERTIES
Electrical conductivity %IACS 28%
Thermal conductivity W/(m·K) 126
Thermal expansion coefficient (0–300 °C) 10-6/K 19.7
Density 8.55 g/cm3
Modulus of elasticity 114 Gpa
FABRICATION PROPERTIES 
Machinability (CuZn39Pb3 = 100 %) 25%
Capacity for being cold worked Excellent
Capacity for being hot worked Fair
Resistance welding (butt weld) Good
Inert gas shielded arc welding Fair
Gas welding Good
Hard soldering Excellent
Soft soldering Excellent
Melting range 910-965 °C
Hot working 750 – 870 °C
Soft annealing (1–3 h) 450–680 °C
Thermal stress relieving (1–3 h) 200–300 °C

CW707R

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