| 摘要 |
PROBLEM TO BE SOLVED: To provide a copper alloy material for electrical parts having excellent strength, proof stress, elongation and electric conductivity and also having superior bendability. SOLUTION: The copper alloy material has a composition containing, by mass, 1.0 to 5.0% Ni, 0.2 to 1.0% Si, 0.05 to 2.0% Sn, 0.1 to 5.0% Zn, 0.01 to 0.3% P and 0.05 to 1.0%, in total, of either or both of Fe and Co. This copper alloy material can be manufactured through the following steps: a first cold rolling step where cold rolling is performed to a thickness 1.1 to 1.3 times the desired final sheet thickness; a first heat treatment step where a material after the first cold rolling is heated to 700 to 850°C and then cooled to≤300°C at≥25°C/min temp. fall rate; a second cold rolling step where the material after the first heat treatment is cold rolled to the desired final sheet thickness; and a second heat treatment step where the material after the second rolling is heated to 400 to 500°C and held for 30 min to 3 h. COPYRIGHT: (C)2007,JPO&INPIT
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