| 摘要 |
PROBLEM TO BE SOLVED: To provide: a galvanized steel sheet which is excellent in platability, processability including bendability and hole expansion properties, delayed fracture resistance characteristics, and impact absorption characteristics and has a tensile strength of 980 MPa or higher; and an alloyed galvanized steel sheet.SOLUTION: A high-strength plated steel sheet has a plating layer on the surface of a steel sheet, contains specified steel components and comprises: an internal oxide layer containing an oxide(s) of Si and/or Mn; a soft layer which contains the internal oxide layer and has a Vickers hardness with 90% or smaller of the Vickers hardness in the depth of t/4 (t=the thickness of the steel sheet) of the steel sheet; and a hard layer composed of a structure based on martensite and bentonite, in order from the boundary surface between the steel sheet and the plating layer to the side of the steel sheet. The average depth T of the soft layer is 20 μm or greater, and the average depth t of the internal oxide layer is 4 μm or greater and small than T. |
