W-7 Eco
EN 1982 CC492K, CC498KCuSn7Zn2Pb3-B, CuSn6Zn4Pb2-B
- Our W-7 tin bronze alloy also known as red bronze or leaded gunmetal following the European directive 2002/95/EC ROHS (Restriction Of Hazardous Substances).
- It complies with the EN 1982 CC492K, CuSn7Zn2Pb3-B standard and the CC498K, CuSn6Zn4Pb2-B.
- It is a bronze alloy which is ideal for bearings, sliding plates up to peaks of 4,000 N/cm2 and appropriate for emergency sliding. It is resistant to sea water.
- It is available in hollow and solid round bars, rectangular and square bars, half moons and based on the design of the client.
Chemical composition
| % min. | % máx | |
|---|---|---|
| Cu1 | resto | |
| Sn | 5,6 | 8 |
| Pb | 2 | 4 |
| Zn | 6,0 | 8,0 |
| Ni | 1,0 | |
| Σ Others | 1,0 |
1Including nickel
Mechanical properties (Minimum values)
| Proceso de moldeo y designación | C. Continuous and C. Centrifugal |
|---|---|
| Tensile Strength (N/mm2) |
240 |
| Yield Point (N/mm2) |
120 |
| Elongation (A%) |
12 |
| Hardness HB-10-1000 | 70 |
1 For pieces with an exterior diameter of ≤ 300 mm. For larger sizes values to be agreed with the order.
Physical properties
| Density kg/dm3 |
8,8 |
|---|---|
| Specific Heat j/g. k |
0,356 |
| Thermal Expansion 10-6 k |
18,5 |
| Thermal Conductivity W/m. ºk |
64 |
| Electrical Conductivity m / (Ohm.mm2) |
8,5 |
Optional thermal treatments available on clients’ request
| Proceso | Temperature | Time | Cooling | Time |
|---|---|---|---|---|
| Destensionado | 400°C | * | En horno | 4h |