Patent ID: 7727345

Claim:
A method of manufacturing a copper alloy, comprising the steps of: (a) melting and casting a raw material for said copper alloy, to form an alloy material; (b) solution treating said alloy material at a temperature in a range of 700 to 950° C.: (c) carrying out aging on said solution treated alloy material by heating said solution treated alloy material at a temperature in a range of 400 to 600° C. for two to eight hours; and (d) cooling said alloy material after said aging is carried out at a cooling rate in a range of 10 to 50° C. per hour until said alloy material is cooled to a temperature in a range of 380° C. to 350° C. to precipitate an inclusion in said copper alloy, wherein a size of an inclusion precipitated in said copper alloy is equal to or smaller than 2 μm, and a total volume of said inclusion precipitated which is 0.1 to 2 μm in size is smaller than 0.5% of a total volume of said copper alloy, wherein said copper alloy has a tensile strength equal to or higher than 800 MPa.