METHOD OF MANUFACTURING NON-ORIENTED ELECTROMAGNETIC STEEL PLATES.

摘要

An object of the present invention is to provide a method of manufacturing a non-oriented electromagnetic steel plate, capable of saving energy by reheating a slab in a hot state, and of obtaining a non-oriented electromagnetic steel plate, which has excellent magnetic characteristics and uniformity of magnetic characteristics over the whole length of a coil, without retaining the heat of the slab. To achieve the object of the present invention, a continuously cast slab of predetermined composition is reheated in a high temperature region while controlling the thermal hysterisis of the slab to the conditions under which the slab passes twice a region in the vicinity of a precipitation nose, whereby the enlarging of AlN precipitate and the uniforming of the enlargement of this precipitate over the whole length of the slab are achieved. The resultant slab is then hot-rolled, and the hot-rolled plate is annealed under special conditions so as to attain the coagulation and enlargement of AlN and the growth of recrystallized particles of ferrite.