Patent ID: 11591673

Abstract:
There are provided an inexpensive copper alloy plate having excellent bending workability, excellent stress corrosion cracking resistance and excellent stress relaxation resistance while maintaining the high strength thereof, and a method for producing the same. The copper alloy plate has a chemical composition which contains 17 to 32% by weight of zinc, 0.1 to 4.5% by weight of tin, 0.5 to 2.0% by weight of silicon, 0.01 to 0.3% by weight of phosphorus and the balance being copper and unavoidable impurities, wherein the total of the content of silicon and six times as much as the content of phosphorus is 1% by weight or more and wherein the copper alloy plate has a crystal orientation satisfying I{220}/I{420}≤2.0 assuming that the X-ray diffraction intensity on {220} crystal plane on the plate surface of the copper alloy plate is I{220} and that the X-ray diffraction intensity on {420} crystal plane thereon is I{420}.