CW707R

DESCRIPTION

CW707R is a dezincification resistant brass with excellent cold working properties and a pure α-structure. This alloy is used for applications in warm, acidic waters. CW707R is also suitable for coining, riveting, crimping, flanging, cold extrusion or other cold working operations.

CHEMICAL COMPOSITION

Elements Min (%) Max (%)
Cu 68.50 71.50
Pb - 0.07
Fe - 0.05
As 0.02 0.06
Total Others - 0.20
Zn Remainder

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

TYPICAL USES

  • Architecture
  • Automotive
  • Builders Hardware
  • Consumer
  • Electrical
  • Fasteners
  • Industrial
  • Ordnance
  • Plumbing