| 摘要 |
A high-strength hot-dip galvanized steel sheet which includes a steel sheet that comprises major components and that contains at least 40 vol.% the sum of bainite and martensite, 8-60 vol.% retained austenite, and less than 40 vol.% ferrite, with the remainder comprising an incidental structure. The hot-dip galvanized steel sheet has, at the interface between the deposit layer formed by hot-dip galvanization and the base steel sheet, an intermetallic compound constituted of Fe, Al, Zn, and incidental impurities and having an average thickness of 0.1-2 [mu]m, the intermetallic compound having a crystal grain diameter of 0.01-1 [mu]m. After the deposit layer formed by hot-dip galvanization was removed, the surface of the base steel sheet has an arithmetic average roughness Ra of 0.1-2.0 [mu]m and gives a roughness curve in which the contour elements have an average length RSm of 5-300 [mu]m. Thus, a high-strength hot-dip galvanized steel sheet which includes a high-strength steel sheet as the base and which has excellent formability that can inhibit cracking or breaking is provided. |
