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C688 (CuZn23Al3,5Co)
Standard designation
EN not standardised/UNS C68800
| Chemical composition | |
|---|---|
| Cu | Rest |
| Zn [%] | 23 |
| Al [%] | 3.5 |
| Co [%] | 0.4 |
Description/applications
C688 belongs to the group of copper-zinc materials with further alloy elements. C688 is characterised by a high level of strength and good bending properties. Applications: connectors, insulation displacement connectors
| Physical properties¹ | |
|---|---|
| Density | 8.2 g/cm³ |
| Electrical conductivity | 10.4 m/Ω·mm² 18 %IACS² |
| Thermal conductivity | 81 W/m·K |
| Thermal expansion coefficient | 18.2·10-6/K |
| E modulus | 115 GPa³ |
| ¹Approximate values in soft state, measured at ambient temperature ²IACS = International Annealed Copper Standard ³1 GPa = 1 kN/mm² |
| Processing information | |
|---|---|
| Weldability | good |
| Solderability | medium |
| Stress crack corrosion | low vulnerability |
| Mechanical properties | |||||
|---|---|---|---|---|---|
| State | Tensile strength Rm [MPa] | Yield strength Rp0.2 [MPa] | Elongation A50 [%] |
Hardness HV |
|
| R530 | 530-600 | min. 305 | min. 30 | 150-180 | |
| R600 | 600-695 | min. 435 | min. 10 | 180-220 | |
| R670 | 670-770 | min. 565 | min. 3 | 190-230 | |
| R730 | 730-825 | min. 655 | min. 2 | 200-240 | |
| R780 | 780-875 | min. 705 | min. 2 | 210-250 | |
| R850 | 850-915 | min. 765 | min. 1 | 220-260 | |
| R895 | min. 895 | min. 805 | min. 1 | min. 235 |