CONTINUOUS CASTING AND DEFORMATION INSTALLATION FOR THE PRODUCTION OF STEEL PLATES FOR WELDED PIPES. Report 1

The shortcomings of modern technology of thick-plate rolling, leading to the problems in production of welded pipes, are described. Advantages of thin slab casting technology are indicated, in which casting and reduction of a billet with a liquid phase are combined. The design of the combined continuous casting and deformation installation is described and the technology of steel plate production for welded pipes is provided. The main task of the article was to determine the stress-strain state of metal during formation of a strip from the ingot steel coat with a liquid phase by the coat with a liquid phase narrow walls bending. Computational experiment based on the solution of continuum mechanics task by means of the finite element method was used as a method of investigation. For calculations, a grid of finite elements was taken for a quarter of the model and a coat narrow wall with a facet length of0.5 mm. The elastic-plastic contact task is solved considering large displacements and deformations, and a stress-strain state during formation of a strip in a zone of bending of a coat with liquid phase narrow walls is determined. The calculation was carried out in a flat setting (flat deformed state). The initial data for the solution of the task using advanced ANSYS software are presented. The task statement and the boundary conditions are described. Dependences for calculation of the modulus of elasticity and plastic deformation resistance on temperature, strain degree and strain rate are presented. Epures of displacements, stresses and deformations of metal in the bending zone of a coat with a liquid phase narrow wall are presented. The regularities of distribution of tensile stresses along the outer surface and along the thickness of a coat narrow wall with a liquid phase are described as well as the ways of reducing tensile stresses on the side surfaces of a coat with a liquid phase. 

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