Method for producing hot rolled steel sheet and apparatus therefor

摘要

A method and hot rolling apparatus for producing a hot rolled steel sheet (3) include a roughing rolling mill (12) to roughing roll a heated slab into a sheet bar, at least one solenoid-type induction heater (4) arranged for re-heating the sheet bar over its entire width, and a finish rolling mill (6) arranged to finish roll the re-heated sheet bar into a hot rolled steel sheet having a predetermined thickness. An initial temperature before rolling is set to be low, and re-heating of the sheet bar is carried out around the middle of the hot rolling apparatus. The thermal energy required for rolling is thereby reduced as a whole without damaging the quality of the resulting hot rolled steel sheet. A descaling apparatus (5) is provided prior to the finish rolling mill to remove oxide scales on surfaces of the sheet bar, whereby the resulting hot rolled steel sheet is free of scale flaws and exhibits superior surface properties. <IMAGE>