| 摘要 |
<p>The present invention relates to a high strength hot-rolled steel sheet used as a material for a vehicle, home appliances, and building construction. In particular, the present invention relates to the high strength hot-rolled steel sheet used for manufacturing a hot-dip galvanized steel sheet, a hot-dip galvanized steel sheet using the same, and an alloyed hot-dip galvanized steel sheet, and a manufacturing method thereof. More particularly, when the hot-dip galvanized steel sheet is manufactured by using the high strength steel sheet, a hot-rolling process is prioritized to be controlled so that a buckling phenomenon can be prevented and the hot-rolled steel sheet having excellent cold rolling properties can be manufactured. When the hot-dip galvanized steel sheet is manufactured, conditions of an annealing process are controlled to effectively prevent elements, which are included in the steel sheet and easy to be oxidized, from being diffused. Therefore, the hot-dip galvanized steel sheet or the alloyed hot-dip galvanized steel sheet having excellent surface quality can be obtained.</p> |
