| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a high-strength galvannealed steel sheet having excellent workability and corrosion resistance and a method for producing the steel sheet. <P>SOLUTION: The galvannealed steel sheet excellent in ductility and corrosion resistance contains 0.10-0.50 mass% C, 0.005-2.0 mass% Si, 1.0-3.0 mass% Mn, 0.005-2.0 mass% Al,≤0.05 mass% P,≤0.02 mass% S and≤0.006 mass% N. A microstructure of the galvannealed steel sheet contains 10-75% ferrite and 2-30% retained austenite by the area ratio. The amount of C (carbon) in the retained austenite is 0.8-1.0%. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
