Morphology Changes of Manganese Sulphide Inclusions in the Manufacturing Process of Grain Oriented 3% Silicon Steel Strip

Abstract

Until recently, conventional grain oriented silicon steel strip was made exclusively from ingots. In conventional procedures, reheating to exceedingly high temperature is necessary to assure solution of MnS in the slab prior to hot rolling.
In this paper, therefore, the authors investigated the morphology changes of MnS in the manufacturing process without being reheated in exceedingly high temperature for solution treatment. It was found out that the MnS inclusions were broken into small particles, or deformed and recrystalized into small crystals. On the other hand, the temperature at which all the manganese sulphide was dissolved depended on the product of the concentrations of sulphur and manganese in solution in the 3% silicon steel.