Patent ID: 6978531

Claim:
A method for manufacturing hot rolled steel sheets comprising the steps of: passing molten steel through a continuous caster having a mold after having been poured into a ladle and a tundish to manufacture a slab; cutting the slab to predetermined lengths using a cutter to form a plurality of cut slabs; heating the cut slabs to 1000° C. or above to form MnS precipitation on the cut slabs in a first heating furnace; width rolling the cut slabs by using a width roller; descaling the cut slabs heated in the first heating furnace; rolling the slabs in a reduction unit to a predetermined thickness to form a plurality of flat bars; heating the flat bars to a predetermined temperature in a second heating furnace; coiling the flat bars by a coiling station while the flat bars are maintained in a heated state; uncoiling the flat bars by an uncoiler; and rolling the flat bars to a predetermined thickness in a finishing mill.