Patent ID: 7976652

Claim:
A method for producing beryllium-copper containing at least Be and Cu, comprising: holding the beryllium-copper for a predetermined solid solution time in a solid solution temperature range in which the Be is dissolved into the Cu; cooling the beryllium-copper at a cooling speed at which the Be remains dissolved in the Cu; applying plastic strain to a cooled beryllium-copper over multiple times in a processing temperature range in which the Be is not precipitated; and holding the beryllium-copper to which the plastic strain is applied for a predetermined age hardening time in a precipitation temperature range in which the Be is precipitated; wherein the beryllium-copper to which the plastic strain is applied is a rectangular parallelepiped having sides which extend in directions of three axes which are orthogonal to each other, and a ratio of lengths of the sides extending in the directions of the three axes which are orthogonal to each other is 1:e:f (1.2≦e≦1.3, 1.45≦f≦1.55), and wherein the applying step includes applying pressure to the beryllium-copper from each of the directions of the axes by turns, and an amount of the plastic strain applied to the beryllium-copper by a single pressurization is within a range from 0.3 to 0.7.