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CW617N
CW617N
CW617N (chemical designation CuZn40Pb2) is the primary European benchmark alloy for hot stamping, closed-die drop forging, and press forming, defined under EN 12165 (forging stock and billets) and EN 12420 (forgings). Built on an (α + β) duplex brass structure, it is formulated with 57.0% to 59.0% copper and a tightly controlled 1.6% to 2.5% lead (Pb) content. This metallurgical composition maximizes high-temperature plastic deformation in forging dies without hot-cracking, while the evenly distributed lead inclusions provide clean chip clearance during subsequent high-speed CNC finish-machining.
Chemical Composition
Elements | Min (%) | Max (%) |
Cu | 57.00 | 59.00 |
Al | – | 0.05 |
Fe | – | 0.30 |
Ni | – | 0.30 |
Pb | 1.60 | 2.50 |
Sn | – | 0.30 |
Total Others | – | 0.20 |
Zn | Remainder | |
Mechanical Properties According To EN12164 (As Per Temper R430)
Range (mm) |
From |
To |
UTS Min (N/mm²) |
PS Min (N/mm²) |
Elongation Min (%) |
Hardness Min (HV) |
Hardness Max (HV) |
|
| Round (Dia) | 2 |
40 |
430 |
220 |
10 |
– |
– |
|
| Hex (A/F) | 2 |
35 |
430 |
220 |
10 |
– |
– |
|
| Square (A/F) | 2 |
35 |
430 |
220 |
10 |
– |
– |
|
| Rectangle (Thickness) | 3 |
40 |
430 |
220 |
10 |
– |
– |
|
Physical Properties | Metric | English |
| Density | 8.40 g/cc | 0.303 lb/in3 |
| CTE, linear | 26.0 ᶙm/m-˚C | 14.4 ᶙin/in-˚F |
| Specific Heat Capacity | 0.380 J/g-˚C | 0.0908 BTU/lb-˚F |
| Thermal Conductivity | 113 W/m-K | 784 BTU-in/hr-ft²-˚F |
| Melting Point | 880-900 ˚C | 1620 – 1650 ˚F |
| Solidus | 880 ˚C | 1620 ˚F |
| Liquidus | 900 ˚C | 1650˚F |
Fabrication Properties
| Forming | Suitability |
| Machinability (CuZn39Pb3 = 100 %) | 95.00% |
| Capacity for Being Cold Worked | Poor |
| Capacity for Being Hot Worked | Excellent |
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