CW707R
CW707R Spec SheetCW707R 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) | UTS Min (MPa) |
UTS Max (MPa) |
PS Min (MPa) |
Elongation Min (%) |
Hardness Min (HRB) |
Hardness Max (HRB) |
||
|---|---|---|---|---|---|---|---|---|
| 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 | |
|---|---|
| Technique | Suitability |
| 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
