Patent ID: 7291232

Claim:
A process for producing a high strength and high electrical conductivity copper, comprising: melting and casting raw material to obtain an alloy containing 1-3 wt. % nickel, 0.2-0.7 wt. % silicon, remainder copper and unavoidable impurities; solution annealing the alloy to produce an annealed alloy having a grain size up to 0.015 mm and an electrical conductivity of up to 26% IACS; cold deforming the annealed alloy to produce a cold-deformed annealed alloy; precipitation annealing the cold-deformed alloy at a temperature of 450-500° C. for four to ten hours with a cooling rate of 10-20° C./hour between the annealing temperature and a temperature of approximately 300° C.; and obtaining a copper alloy having a yield strength of at least 90 ksi and an electrical conductivity of at least 50% IACS.