Effects of Mn and S on the grain growth and texture in cold rolled 0.5% Si steel.

Abstract

The effects of manganese and sulphur on the grain growth and texture development during isochronal annealing have been investigated for cold rolled 0.5% Si steel. Although both Mn and S affect the grain growth, its dependency on Mn content is influenced by the S level. In steels containing 0.004 to 0.017% S, an increase in Mn content promotes the grain growth through decreasing the amount of fine manganese sulphide particles. In ultra-low S steels containing less than 0.001% S, however, the grain growth is inhibited with Mn addition by the precipitation of manganese silicon nitride (MnSiN2). On the other hand, the changes in recrystallization texture being accompanied by grain growth depend only on Mn content, a higher Mn content results in an increase in {222} component. This fact is considered to be related to the change in solute N content being counterbalanced with MnSiN2 precipitation.