COPPER ALLOY SHEET MATERIAL

摘要

A copper alloy sheet material which has a tensile strength of 730-820 MPa and contains at least nickel and silicon besides copper and incidental impurities. When the sheet material has a shape capable of 180° tight bending and the width and thickness of this sheet material are expressed by W (unit: mm) and T (unit: mm), respectively, then the product of W and T is 0.16 or less. Preferably, the sheet material is constituted of an alloy containing 1.8-3.3 mass% nickel, 0.4-1.1 mass% silicon, and 0.01-0.5 mass% chromium, with the remainder being copper and incidental impurities. The sheet material may further contain one or more of: at least one member selected among tin, magnesium, silver, manganese, titanium, iron, and phosphorus in a total amount of 0.01-1 mass%; 0.01-10 mass% zinc, and 0.01-1.5 mass% cobalt.