HIGH STRENGTH HOT-ROLLED STEEL SHEET HAVING EXCELLENT CONTINUOUSLY PRODUCING PROPERTY HIGH STRENGTH GAVANIZED STEEL SHEET HAVING EXCELLENT SURFACE PROPERTY AND PLATING ADHESION AND METHOD FOR MANUFACTURING THEREOF

摘要

0.1 to 0.3% of C, 1 to 2.0% of Si, 2.6 to 5% of Mn, 0.001 to 2% of sol.Al, Ti: (48/14) : Not more than 0.04% (excluding 0%), S: not more than 0.015% (excluding 0%), N: not more than 0.02% (excluding 0%), Sb, Bi, Sn, Wherein the inner surface of the hot-rolled steel sheet has an inner oxide containing at least one element selected from the group consisting of Si, Mn, Al and Fe, and the maximum depth of the inner oxide is 1 μm or less A high-strength hot-rolled steel sheet, and the like.