| 摘要 |
PURPOSE:To produce a copper alloy having excellent tensile strength and electrical conductivity with the conserved energy by subjecting an ingot of a copper- base alloy contg. a specific ratio of Fe to hot rolling and cold rolling then to two stages of age annealing under specific conditions. CONSTITUTION:The ingot of the copper-base alloy contg. 1.5-3.0wt% Fe is subjected to hot rolling at 800-1,050 deg.C then to cold rolling at >=90% total reduction rate of area. After the alloy is subjected to 30min of annealing at 550 deg.C (not inclusive of 550 deg.C)-600 deg.C in succession thereof, the alloy is subjected to the 2nd annealing for >=30min at 450-525 deg.C. The high tension high conductivity copper alloy having about >=33kgf/mm<2> tensile strength, about >=25% elongation and about >=65% IACS electrical conductivity is obtd. by this method. This copper alloy is usable as a material for electronic parts, more particularly, semiconductor lead frames and terminals.
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