Abstract In spite of many decades of research and continuous improvement of the quality of electrical steel we still cannot be satisfied today with processing cost as well as the magnetic properties of the commercial products [1]. The improvement of magnetic properties of electrical steel concerns many metallurgical aspects: microstructural features such as grain size, crystallographic texture or inclusions are important. Grain growth together with precipitation is fundamental processes of microstructural and textural evolutions taking place during the thermo-mechanical processing of electrical steels [2]. They are of major scientific interest and presents great importance in a wide range of industrial applications. The present paper is aimed to investigate of grain growth processes induced by gradient of generated deformation in grain oriented electrical steels (GO). Dynamic grain boundary motion was investigated by difference of deformation value that was generated on the experimental steel. The gradient of deformation in materials was carried out in cross section of the investigated steels. The mentioned gradient was obtained by hardness testing machine. The value of deformation gradient inside of material was changed because of external stress that was carried out by force load tools of the hardness tester. This work is an investigation of the influence of different intensity of deformations on grain growth taking place exclusively in one sample. The obtained experimental results were realized to deeper understanding of grain growth phenomena in the grain oriented electrical steels.