Apparatus for manufacturing thin steel sheet and method for manufacturing thin steel sheet

A method for manufacturing a thin steel sheet using an apparatus for manufacturing a thin steel sheet, the method comprising:

• providing an apparatus for manufacturing a thin steel sheet, with which continuous casting, passing-through a holding furnace, and finish rolling are able to be continuously performed without cutting a slab, the apparatus comprising the followings which are arranged in order:
• a continuous casting machine for a thin slab having a slab thickness of 70 mm to 120 mm at a lower end of a mold;
• the holding furnace that is configured to maintain a temperature of a cast slab and/or heats the cast slab;
• and
• a rolling stand by which finish rolling is performed,
• wherein the apparatus has a reduction roll on a downstream side of a solidification completion position of the slab in the continuous casting machine, and
• the slab is able to be reduced by the reduction roll;
• the holding furnace being one of a furnace in which the slab passes through an atmosphere kept at a high temperature and a furnace in which the slab is heated by induction heating,
• setting a casting speed of the thin slab at the lower end of the mold to 4 to 7 m/min;
• and
• reducing the slab at a rolling reduction of 30% or more by the reduction roll after solidification is completed and when a center temperature of the slab is 1300° C. or higher.