Patent ID: 9080228
Filing Date: 2015-07-14
Classification: B21B,C22C,C22F,H01B

Abstract:
1. A copper alloy sheet comprising: 5.0 mass % to 12.0 mass % of Zn; 1.1 mass % to 2.5 mass % of Sn; 0.01 mass % to 0.09 mass % of P; and 0.6 mass % to 1.5 mass % of Ni, with a remainder of Cu and inevitable impurities, wherein an average crystal grain diameter of the copper alloy sheet is 1.2 μm to 5.0 μm, round or oval precipitates are present in the copper alloy sheet, an average grain diameter of the precipitates is 4.0 nm to 25.0 nm or a proportion of precipitates having a grain diameter of 4.0 nm to 25.0 nm in the precipitates is 70% or more, and a content of Zn [Zn] mass %, a content of Sn [Sn] mass %, a content of P [P] mass % and a content of Ni [Ni] mass % have a relationship of 20≦[Zn]+7×[Sn]+15×[P]+4.5×[Ni]≦32.