Use of a copper alloy

1. A method, comprising:

producing a casting mold or casting mold component from a copper alloy consisting of, in percent by weight (proportion by mass of a melt analysis in %):

Silver (Ag) 0.020-0.50

Zirconium (Zr) 0.050-0.50

Phosphorus (P) 0.0015-0.025

Chromium (Cr) not more than 0.005,

balance copper (Cu) and other alloying elements including unavoidable impurities, with a proportion of the other alloying elements being less than or equal to (≤) 0.50;

casting the copper alloy;

hot forming the copper alloy at a forming temperature in a range from 600 to 1000° C.;

quenching the copper alloy from the forming temperature at 50 to 2000 K/min;

cold forming the copper alloy by 10 to 50%; and

hardening the copper alloy at a temperature of 350 to 500° C.

2. The method of claim 1 , further comprising cold forming the copper alloy after hardening.

3. The method of claim 1 , further comprising:

after undergoing the casting operation, solution heat treating the copper alloy at a temperature in a range from 600 to 1000° C.

4. The method of claim 3 , further comprising cold forming the copper alloy after hardening.

5. The method of claim 1 , further comprising casting a metal melt with the casting mold or casting mold component, wherein the casting mold or casting mold component in one region in contact with the metal melt softens and/or recrystallizes under thermal influence of the metal melt, whereas in another region in contact with a cooling medium, the casting mold or casting mold component has a strength which is higher than a strength of the one region.