The typical copper-zinc alloys are not curable (thermosetting). Thus, a higher hardness and strength can only be achieved through the cold-forming process.
The properties of copper-zinc alloys with relation to zinc content can be found in figure 11. With increasing zinc content, up to approximately 45% zinc, the alloy's tensile strength and Brinell Hardness also increases. The breaking elongation is at its highest value when the alloy contains roughly 30% zinc. Thus, CuZn30 is ideal for cold-forming.
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CuZn37, for economic reasons, is the main alloy used for cold-forming in Germany, although CuZn30 is nearly as suitable. Certain additives improve the mechanical properties of copper-zinc alloys and in some cases an alloy is created with better wear and lubricating properties. At cold-forming temperatures, the hardness and tensile strength of the alloy increases (Figure 12) while the breaking elongation point decreases.
The mechanical properties of copper-zinc wrought alloys, depending on the alloy's content, can be found in the expandable table.
The tensile strength of the binary copper-zinc wrought alloys as strip or sheet, depends on the composition and degree of cold forming. A tensile strength falls between 230 and 610 N / mm2, with Brinell HB 45-180. The Vickers hardness (HV) measurement scale requires slightly higher values than the Brinell hardness.
CuZn37 is a good material for springs (spring properties for tapes and wires). Single-phase α-copper-zinc alloys are suited to deep drawing. The cupping test values for CuZn36, R300 (and CuZn37, R300, depending on the sheet thickness: 0.3 - 2 mm) are between between 11 to 14.3 mm.
CuZn37 ist ein guter Federwerkstoff (Federeigenschaften für Bänder und für Drähte. Einphasige α-Kupfer-Zink-Legierungen lässen sich gut tiefziehen. Die Tiefungswerte für CuZn36, R300 (und CuZn37, R300 liegen je nach Blechdicke (0,3 - 2 mm) zwischen 11 - 14,3 mm.