Abstract
In an attempt to produce grain oriented silicon steel sheets without conventional high temperature slab reheating and hot rolling processes, series of experiments were carried out using two types of cast slabs of 5 mm and 40 mm thick. Relationship between the magnetic properties and the morphology of MnS was investigated for various processing conditions.
In the cast slab of 40 mm thick, the changes in magnetic properties were examined after processing without reheating to an exceedingly high temperature for solution of MnS.
In the cast slab of 5 mm thick, good magnetic properties were obtained without slab reheating or hot rolling. This is due to the fine MnS particles distributed uniformly in the matrix by rapid cooling in the solidification process. In the conventional casting, coarse MnS particles and segregation bands are formed due to the slow cooling rate in the solidification process which necessitates a high temperature slab reheating to dissolve these particles.
