Effects of Mn and S on the Grain Growth and Texture in Cold Rolled 0.5% Si Steel

抄録

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.