Evaluation of the quality of three-layer steel bimetallic strips obtained on a unit of continuous casting and deformation

Abstract

Today there is an urgency of creating highperformance continuous processes for the production of bimetals. The article describes the main tasks of improving the quality of the materials under consideration. Two stages of the technology for producing steel threelayer bimetallic strips on the unit of a combined continuous casting and deformation process are considered. The authors give recommendations on the conduct of the technological process in order to obtain highquality bimetallic strips on such unit. The problem statement is presented. The material considers initial data for determining the temperature of the steel base strip and the stressstrain state of the metals of the cladding layers and the strip in deformation center of a threelayer bimetallic ingot. A model for calculating and a method for solving problems of thermal conductivity and elastoplasticity are shown. Regularities of the temperature change of the main steel strip are given during its passage through the molten metal of the cladding layer. Stressstrain state of the metals of the main strip and cladding layers in the deformation center was determined when threelayer bimetallic steel strips were obtained on the unit of combined continuous casting and deformation process. The authors describe the values of compression of the main steel strip and mutual displacement of the layers during compression of the bimetallic ingot by the strikers. Regularities of the distribution of axial and tangential stresses are shown along the contact line of the cladding layer with the striker. The evaluation of the process of obtaining bimetal steel 09G2S - steel 13KhFA - steel 09G2S was made on a pilot unit for continuous casting and deformation. Microstructure of the main strip and cladding layers of a threelayer bimetallic steel strip is shown when a combined continuous casting and deformation process is obtained in one unit. © 2021 National University of Science and Technology MISIS. All rights reserved.