	US 12,129,538 B2
	Use of a copper alloy
Peter Böhlke, Westerkappeln (DE); Hans-Günter Wobker, Bramsche (DE); and Hark Schulze, Hasbergen (DE)
Assigned to cunova GmbH, Osnabrück (DE)
Appl. No. 17/274,095
Filed by KME Special Products GmbH, Osnabrück (DE)
PCT Filed Sep. 13, 2019, PCT No. PCT/DE2019/100816 § 371(c)(1), (2) Date Mar. 5, 2021, PCT Pub. No. WO2020/052714, PCT Pub. Date Mar. 19, 2020.
Claims priority of application No. 10 2018 122 574.1 (DE), filed on Sep. 14, 2018.
Prior Publication US 2021/0214828 A1, Jul. 15, 2021
Int. Cl. C22F 1/08 (2006.01); C22C 9/00 (2006.01)

CPC C22F 1/08 (2013.01) [C22C 9/00 (2013.01)]

5 Claims

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.