| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high strength steel sheet for hot dip galvannealing with a composite structure which improves the defect in appearance after the shaping of a high strength hot dip galvannealed steel sheet with a composite structure composed of a ferritic structure as the main phase, and usable as an automobile outer panel, and to provide a galvanized steel sheet. Ž<P>SOLUTION: Disclosed is a steel sheet for hot dip galvanizing having a composition comprising, by mass, 0.02 to 0.3% C, 0.1 to 2.0% Si, <1.0% Mn, >1.0 to 3.0% Cr, ≤0.02% P, ≤0.02% S, ≤0.014% Al and 0.001 to 0.008% N, and also satisfying 2.5≤1.5Mn%+Cr% and 4.1-2.3Mn%-1.2Cr%≤Si%, and the balance Fe with inevitable impurities. If required, one or more kinds selected from 0.01 to 1% Co and 0.01 to 1.5% Mo are further incorporated therein. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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