Softening of CuZn36 after 3 hrs annealing after 25% cold working

Because of their good elastic spring properties and formability the copper-tin alloys CuSn6 and CuSn8 are standard materials for spring contact elements in electrome-chanical components such as connectors, switches, and relays ''(Tables 5.9 and 5.10)''. Besides these other alloys such as CuSn4 and CuSn5 and the multi-metal tin bronze CuSn3Zn9 have significant usage – mainly in North America.

Fig. 5.13: Softening of CuSn8 after 3 hrs annealing after 50% cold working

=====5.1.4.3 Copper-Nickel-Zinc Alloys (German Silver)=====