METHOD OF PRODUCTION OF THE BLOOMS Russian patent published in 2007 - IPC B21B1/02 

FIELD: ferrous metallurgy; other industries; methods of production of the blooms.

SUBSTANCE: the invention presents the method intended for expansion of the blooms production process capabilities and improvement of the quality of the sectional bars at production out of the steel continuously casting slabs of the blooms used at the rolling of the sectional bars. The method provides for the multi-run drafting of the steel cast product in the rolls with the open box passes and the flat barrel at first into the blooms, and then in the rolls with the open box passes - into the bloom. Improvement of the microstructure of the rolled product and the increased stability of the rolling process is attained due to the fact, that in the capacity of the steel cast product use the continuously cast slab with the ratio of its width to its thickness does not exceed 5.3, which (the slab) is then cogged out into the bloom with the ratio of the thickness to the width of 2.4÷2.6 in the rolls, the average rolling diameter of the passes of which is no less than slab width. At that the drafting of the steel cast slab is conducted with saving of its thickness, and during the first three passes the bloom is swaged with the individual draughts, which are not exceeding the value of 1.15.

EFFECT: the invention ensures expansion of the blooms production process capabilities and improvement of the quality of the sectional bars at production out of the steel continuously casting slabs of the blooms used at the rolling of the sectional bars.

3 cl, 1 tbl