| ASTM-UNS No. | Wieland Designation | EN Designation | EN No. | JIS No. | Data Sheet | ||
|---|---|---|---|---|---|---|---|
| C70250 | K55 | CuNi3Si1Mg* | - | - | download | ||
| C70350 | K57 | CuNi1Co1Si* | - | - | download | ||
| C19005 | K73 | CuNi1ZnSi* | - | - | download | ||
| C18070 | K75 | CuCrSiTi* | - | - | download | ||
| C19010 | K76 | CuNiSiP* | - | - | download | ||
| C70350 | K78 | CuNi2Co1Si | - | - | download | ||
| C15100 | K82 | - | - | - | download | ||
| C18080 | K88 | CuCrAgFeTiSi* | - | - | download |
High-performance copper alloys are built on precipitation hardening using elements such as Nickel, Chromium, Silicon, Cobalt and Zirconium combined with a sophisticated process routing. This results in superior mechanical and electrical properties even at elevated temperature. The result is a material family that keeps a connector’s spring force high over long periods in service (relaxation resistance), the defining requirement for contacts in various industries, such as automotive, industrial and computing. We split the family into High-Strength types (K55 CuNi3SiMg, K57 CuNiCo1Si, K73 CuNi1ZnSi, K76 CuNi1SiP, K78 CuNi2Co1Si) and High-Conductivity types (K75 CuCrSiTi, K82 CuZr, K88 CuCrAgFeTiSi).
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| Strip thickness | 0.05–1.50 mm (other gauges on request) |
| Strip width | standard up to 200 mm per EN 1652 (wider on request) |
Spring connectors, press-fit connectors, contact springs in terminal blocks, relays, switches, miniaturized connectors (e.g. board-to-board), and sockets for microprocessors.
