CYCLIC DEFORMATION UNIT FOR CONTINUOUS SLABS REDUCTION

The usage of units with high reduction in the casting and rolling module would allow to improve the quality of the mill products due to intensive processing of bulk continuous cast slabs along the section and obtainment of homogeneous fi ne-grained metal structure, as well as to increase the cross-section of the continuous cast slab. The analysis of the formation causes of nonmetallic inclusions and liquates in the axial zone of thick-plate steel was carried out. The analysis of the deformation unevenness along the slab height during the reduction of large continuous cast slabs was performed at mill 5000 of JSC “Magnitogorsk Metallurgical Plant”. The design is described and the technological possibilities for defi nition of the cyclical deformation are presented for the preliminary deformation of continuous cast slabs. The technology is described and the parameters of the strikers for preliminary deformation of large continuous slabs were determined. The experimental study results of the deformation process of continuous cast slabs of steel 45 and steel 12Cr18Ni10Ti are given. The evaluation of the structure of continuous cast metal in the process of reduction of continuous cast billets at a cyclic deformation facility was carried out. The main parameters of the installation for preliminary deformation of large continuous cast slabs were determined. The technological possibilities of the installation for cyclic deformation were stated in terms of the essential improvement of the quality of sheet blanks. Based on the analysis of technological possibilities, it was proposed to use the cyclic deformation installation in the continuous casting line for preliminary reduction of large continuous cast slabs in order to fully adjust the speed of continuous casting and cyclic deformation and provision of the one-pass reduction with the degree of deformation 45 – 90 % to obtain a good casting structure along the slab cross-section. It was suggested, when using the installation in the line of a continuous casting machine, to perform reduction of continuous cast slabs using the heat of the cast metal, thereby substantially reducing the energy consumption in the technological process of producing the sheet blanks. The use of a cyclic deformation installation in the lines of thick-plate and wideband mills for preliminary deformation of heated slabs in one pass is proposed, which will improve the quality of sheet blanks and reduce the number of passes in rolling mills.

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