Development of a finite element model for calculation of the thermal field of coil rolled products in the thermomechanical process

Abstract

A finite element model has been developed in the Deform-3D software package for calculating the thermal field of low-alloy steel coil rolled products during rolling in the finishing group of stands and cooling on the discharge roller table of the 2000 wide-strip hot rolling mill of PJSC Magnitogorsk Iron and Steel Works (PJSC MMK). The proposed model takes into account heat release during plastic deformation, cooling of the strip due to metal contact with air, heat transfer to the work rolls, cooling of the strip by water supplied in the process of interstand cooling and in the accelerated cooling unit on the discharge roller table. At the same time, the features of cooling by both upper and lower collectors are taken into account. To achieve the required coiling temperature, the possibility of differentiated activation of collectors of the upper and lower sections of the accelerated cooling unit was implemented, which was introduced into the finite element model. Cooling by water jets was updated by dividing the contact of the cooled strip with water into two zones - the area of water impact with the sheet surface and the area of film boiling. As a result of the analysis of the thermal state of the sheet, an assessment was made of the nature of its change depending on the characteristics of each stage of thermomechanical treatment (TMT). The use of the presented model in the development of TMT technological modes makes it possible to evaluate their correctness, as well as to provide the possibility of predicting the structure and properties formed over the thickness of rolled steel in the process of controlled rolling with accelerated cooling.P. P. Poletskov, S. V. Denisov, P. A. Stekanov, E. V. Braichev, and P. G. Adishchev, post-graduate student of the MTa-21-2 group, took part in the work.The work was carried out at the Nosov Magnitogorsk State Technical University with the financial support of the Ministry of Education and Science of Russia as part of the implementation of a comprehensive project to create high-tech production (Agreement with the Ministry of Education and Science of Russia No. 075-11-2021-063 dated 06/25/2021).