Influence of Grain Refinement of Hot Band and Cold Rolling Reduction on the Formation of Textures and R ‐Value of Cold RolledPlain Extralow‐Carbon Steel Sheets

Abstract

A textural analysis was carried out to explain the cause of the planar anisotropy of r ‐value of cold rolled plain extralow‐carbon steel sheets. For a detailed analysis, a model for calculating r ‐values from ODF‐data of texture was applied and the influence of each or a group of crystal orientations of the recrystallization texture on the planar anisotropy of r ‐values was studied. The following results were obtained: A development of {111}〈110〉 − {443}〈110〉 − {332}〈110〉 − {221}〈110〉 enhanced the V‐type planar anisotropy of r ‐values. A decrease in the intensity of these orientations by increasing the cold rolling reduction or the refinement of the hot band microstructure reduced the r ‐values in L and C directions and hardly affected the r ‐value in D direction, and as a result, the V‐type planar anisotropy of r ‐values was improved. On the other hand, an increase in the intensity of {111}, {334} orientation by increasing the cold rolling reduction or the refinement of the hot band microstructure raised r ‐values in sequence of L < D < C directions and contributed to the reduction of V‐type planar anisotropy of r ‐values as a whole.