| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive copper alloy sufficient in both electric conductivity as well as strength and capable of coping with size reduction in the electrical and electronic equipment components. SOLUTION: It is possible to inexpensively obtain a copper alloy which has an electric conductivity of not less than 35%IACS and a tensile strength of not less than 410 MPa and is sustainable to 180 degree closed bending in bad way and good way, compliant with JIS Z 2248 by adjusting grain shape and crystal orientation of the grains to suitable ranges. The copper alloy contains 2 to 12 mass% Zn and 0.1 to 1.0 mass% Sn, the Sn mass% concentration ([%Sn]) and the Zn mass% concentration ([%Zn]) are controlled so as to satisfy the relationship: 0.5≤[%Sn]+0.16[%Zn]≤2.0, the balance comprises copper and inevitable impurities thereof, the S concentration in the inevitable impurities is not more than 30 mass ppm, and the O concentration is not larger than 50 mass ppm. COPYRIGHT: (C)2007,JPO&INPIT
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