| 摘要 |
PROBLEM TO BE SOLVED: To provide a technique for stably producing a nonoriented silicon steel sheet excellent in magnetic properties in the longitudinal direction of a coil. SOLUTION: In this method for producing a nonoriented silicon steel sheet uniform in magnetic properties in which a hot rolling stage in which a slab containing at least one kind of, by mass, 0.1 to 4.0% SiO and 0.1 to 2.0% Mn in steel, and the balance substantial Fe is subjected to hot rough rolling to form into a sheet bar, and the same is moreover subjected to finish hot rolling to form into a hot rolled sheet is carried out, and a stage in which the hot rolled sheet subjected to the finish hot rolling is subjected to a cold rolling stage for one time and is next subjected to finish annealing or is subjected to cold rolling for two or more times including process annealing to control its sheet thickness into the final one or is furthermore subjected to skinpass rolling of 2 to <20% to control its sheet thickness into the final one is included, the hot rolling finishing temperature in the above finish hot rolling is controlled to 700 deg.C to the Ar3, and the varying range thereof is controlled to <=100 deg.C. |
