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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
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 |