HIGH STRENGTH HOT ROLLED STEEL SHEET AND COLD ROLLED STEEL SHEET HAVING EXCELLENT CONTINUOUS PRODUCTIVITY, HIGH STRENGTH HOT DIP GALVANIZED STEEL SHEET HAVING EXCELLENT SURFACE QUALITY AND PLATING ADHESION, AND MANUFACTURING METHOD THEREFOR

摘要

Disclosed are a high strength hot rolled steel sheet and the like, the hot rolled steel sheet comprising: by wt%, 0.14-0.3% of C, 1-2.0% of Si, 2.6-5% of Mn, 0.001-2% of sol.Al, (48/14)*[N]-0.1% of Ti, 0.04% or less (excluding 0%) of P, 0.015% or less (excluding 0%) of S, 0.02% or less (excluding 0%) of N, 0.08-0.2% of a sum of one or more types among Sb, Bi, Sn, and Zn, and the balance of Fe and inevitable impurities, wherein an internal oxide containing one or more types of elements among Si, Mn, Al, and Fe is present in the surface layer part of the hot rolled steel sheet, and a maximum depth of the internal oxide is 1 μm or less (including 0 μm).