Determination of deformation penetration conditions through the entire thickness of rolled product at the Steckel mill.

Abstract

Kurpe O. H., Kukhar V. V. Determination of deformation penetration conditions through the entire thickness of rolled product at the Steckel mill. Material working by pressure. 2020. № 1 (50). Р. 249-258.

The aim of the study is to obtain the stress distribution through the thickness of the rolled products along the deformation zone in the conditions of roughing rolling and in the conditions of quasi-stationary temperature distribution during finishing rolling at the Steckel mill. The research has been performed by the simulation based on the Abaqus CAE 6.14-2 software and analytical modeling of the hot rolling process of coils at the Steckel mill with dimensions of 15 mm × 1500 mm, made of steel grade S355JR+AR, according to the requirements of EN 10025-2. Processing of the finite-element modeling results consisted in the analysis of stress and deformation fields. The obtained deviations of the rolling force between simulation, analytical modeling and actual data have comparable results and a similar trend of changes through the passes, the average value of which does not exceed 1.54 % and –1.77 %. For the first time the beginning of the continuous layer formation of equivalent stress during roughing rolling has been determined, and, accordingly, the beginning of the deformation penetration through the entire thickness of the semi-rolled product has been also determined that occurs in the pass 6 when reduction equals 14 %. In the case of finishing rolling in all passes, in the conditions of quasi-stationary temperature distribution at the Steckel mill the deformation that occurs is sufficient and penetrates the entire thickness of the semi-rolled product. The obtained results allow to control the processes of internal quality and the set of rolled product properties that are to be obtained by developing appropriate technological schedules taking into account the penetration of deformation through the thickness of the rolled product. The obtained results can be used to develop hot rolling technology (with one or more stages of roughing rolling) at other types of mills and complexes of basic equipment with similar technological parameters.