| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a hot-dip galvannealed steel sheet which, even though having a high Mn content, is resistant to uneven alloying and excels in surface appearance since the amounts of the MnO particles and the Fe-Al-O alloy layer that cause uneven alloying are controlled. Ž<P>SOLUTION: In the hot-dip galvannealed steel sheet containing 2.0 to 3.5 mass% of Mn, MnO particles are present in the number of 10 or less per micrometer on a straight line lying in an interface between a galvanized zinc-coat layer 2 and a steel sheet 1, an Fe-Al-O alloy layer is present at the interface between the MnO particles and the steel sheet 1, and the length of the Fe-Al-O alloy layer is less than 10% of the overall length of the interface. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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