Cu-Zr-BASED COPPER ALLOY PLATE AND PROCESS FOR MANUFACTURING SAME

摘要

Provided are: a Cu-Zr-based copper alloy plate which retains satisfactory mechanical strength and, at the same time, has a good balance between bending workability and spring deflection limit at a high level; and a process for manufacturing the Cu-Zr-based copper alloy plate. The copper alloy plate contains 0.05-0.2 mass% of Zr and a remainder made up by Cu and unavoidable impurities, and is characterized in that the average value of KAM values as measured by an EBSD method on a scanning electron microscope equipped with an electron backscattered diffraction pattern system is 1.5-1.8°, the R/t ratio is 0.1-0.6 wherein R represents the minimum bending radius at which no cracking occurs and t represents the thickness of the plate in a W bending test, and the spring deflection limit is 420-520 N/mm2.