Dowa Metaltech Co., Ltd.

Wanqing Jiang

Akira Sugawara

Hisashi Suda

Hiroshi Hyodo

A copper alloy sheet material having improved etching characteristics contains (in mass %) Ni: 1.00 to 4.50%, Si: 0.10 to 1.40%, and optionally one or more kind of Co, Mg, Cr, P, B, Mn, Sn, Ti, Zr, Al, Fe, Zn, and Ag. The sheet material has an area ratio S/Sof 0.40 or more in an EBSD measurement on a cross section perpendicular to a rolling direction, wherein Srepresents area of a region satisfying at least one of conditions of a crystal orientation difference from the S1 {241} <112>orientation of 10° or less or a crystal orientation difference from the S2 {231}<124>orientation of 10° or less, and Srepresents an area of a region having a crystal orientation difference from the Brass {011}<211>orientation of 10° or less.

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Tokyo, Japan

Wanqing Jiang