Overlay Clad Strip Quality Assessment in Production at a Continuous Casting and Strain Plant

The work substantiates the relevance of the creation and problem of improving the quality of high-performance continuous bimetal production. The production of steel overlay clad strips on a combined continuous casting and strain unit takes place in two process stages. The article provides recommendations for a high-quality technological process. The recommendations include a problem statement, initial data for the temperature of the steel base strip, stress-strain state of the cladding layers and the strip in the strain zone of the three-layer bimetal ingot. A calculation model and a method for solving problems of thermal conductivity and elastoplasticity are presented. A pattern of the temperature change of the main strip during its passage through the melt of the cladding layer is established, a stress-strain state of the metals of the main strip and the cladding layers in the strain zone is determined. The authors determine the value of the main strip drafting and the mutual displacement of the layers during the reduction of the bimetal ingot by the dies, as well as the patterns of the axial and tangential stress distribution along the contact line between the cladding layer and the die. The results of obtaining bimetal steel 09G2S–steel 13KhFA–steel 09G2S on a pilot continuous casting and strain plant demonstrate the layer interconnection without visible macrodefects, delamination in the contact zone and a homogeneous and fine-grained structure of the cladding layers.