Influence of Annealing Processes on Grain Size Inhomogeneity in Deep Drawing Steel Sheets

The structure and texture of continuous or batch annealing deep drawing and extra-deep drawing steel sheets were observed and analyzed. The results indicate that the surface grain size of the steel sheets is smaller than that of the center by batch annealing, while it is on the contrary of the steel sheets by continuous annealing. The difference is mainly resulted from the original structure and texture inhomogeneity of hot rolled steel plates, and the process of heating and annealing can also have a great effect on the inhomogeneity of the surface and center grain sizes in the steel sheets.