| 摘要 |
<p>An ultra high strength steel sheet and a method for manufacturing a hot-dip galvanized steel sheet using the same are provided to improve coating adhesion and bendability by properly adjusting contents of N and B in the ultra high strength steel sheet. An ultra high strength steel sheet comprises 0.1 to 0.2 weight percent of C, 0.1 to 1.0 weight percent of Si, 2.0 to 3.0 weight percent of Mn, 0.01 to 0.05 weight percent of Ti, 0.01 to 0.05 weight percent of Nb, 20 to 80 ppm of N, 10 to 20 ppm of B, Fe, and inevitable impurities. In the above components, N and B satisfy 2<=N/B<=4. The ultra high strength steel sheet further comprises 0.01 to 0.1 weight percent of Sb. A Zn plating layer or a Zn alloy plating layer is formed on at least one surface of the ultra high strength steel sheet.</p> |
