Effect of sulphur and acid soluble aluminium content on grain oriented silicon steel

Abstract

The effect of sulphur (S) and acid soluble aluminium (Als) content on precipitation behaviours, microstructures and textures of hot rolled grain oriented silicon steels were investigated. The results showed that precipitates were mainly MnS and a little amount of MnS–AlN composite. Similar characteristics of precipitates, microstructures and textures were found in specimens containing similarly higher S content and different Als content. More fine precipitates, less recrystallisation and more and stronger Goss texture component were presented in specimen containing lower S content. It was not Als content but S content that played a key role during hot rolling. High proportion and intensity of Goss texture component were due to the effective inhibiting effect of finely and uniformly dispersed precipitates on dynamic recrystallisation.