| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a hot-dip galvannealed steel sheet which has enhanced appearance properties (specifically prevention of unplated portions and alloying ununiformity) and has a hot-dip galvannealed layer thereon having enhanced adhesiveness to a base steel sheet, and to provide a method for manufacturing the same. <P>SOLUTION: The base steel sheet satisfies 0.04-0.2% C, 0.1-3% Si, 1-3% Mn and 0.06% or less Al (excluding 0%). The hot-dip galvannealed steel sheet has the hot-dip galvannealed layer formed on the surface of the base steel sheet, and an oxide-containing layer formed between the base steel sheet and the hot-dip galvannealed layer. The surface layer part of the hot-dip galvannealed layer includes 5-12% Fe, and the edge part in the oxide-containing layer side of the hot-dip galvannealed layer includes 10-16% Fe. The oxide-containing layer includes Si equal to or more than the Si amount contained in the base steel sheet but equal to or less than 7.0 mass%, and Mn less than the Mn amount contained in the base steel sheet. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
