Method for producing ultra-low carbon steel product

Abstract

A method for producing an ultra-low carbon steel product having a carbon concentration of 0.005% by mass or less includes, at least, a step of adjusting a carbon concentration of molten iron to obtain molten steel, a step of casting the molten steel into a slab, and a step of hot rolling the slab to obtain a hot-rolled steel sheet, in which the method further includes a width reduction step of performing width reduction on the slab with a reduction amount which is predetermined in accordance with the slab width in a direction orthogonal to the rolling direction of the slab.

1 . A method for producing an ultra-low carbon steel product having a carbon concentration of 0.005% by mass or less, the method comprising, at least, a refining step of adjusting a carbon concentration of molten iron to obtain molten steel, a casting step of casting the molten steel into a slab, and a hot rolling step of hot rolling the slab to obtain a hot-rolled steel sheet,
 wherein the method further comprises a width reduction step of performing width reduction on the slab to be subjected to the hot rolling step with a reduction amount which is predetermined in accordance with the slab width in a direction orthogonal to the rolling direction of the slab.   
     
     
         2 . A method for producing an ultra-low carbon steel product having a carbon concentration of 0.005% by mass or less, the method comprising, at least, a refining step of adjusting a carbon concentration of molten iron to obtain molten steel, a casting step of casting the molten steel into a slab, a hot rolling step of hot rolling the slab to obtain a hot-rolled steel sheet, and a cold rolling step of cold rolling the hot-rolled steel sheet to obtain a cold-rolled steel sheet,
 wherein in the cold rolling step, cold rolling is performed at a rolling reduction ratio which is predetermined in accordance with the thickness of the hot-rolled steel sheet.   
     
     
         3 . The method for producing an ultra-low carbon steel product according to  claim 2 , further comprising a width reduction step of performing width reduction on the slab to be subjected to the hot rolling step with a reduction amount which is predetermined in accordance with the slab width in a direction orthogonal to the rolling direction of the slab.