Nosov Magnitogorsk State Technical University, Magnitogorsk, Russia

D. N. Chikishev, Dr. Eng., Associate Prof., Prof., Dept. of Materials Processing Technologies, e-mail: d.chikishev@magtu.ru
E. M. Golubchik, Dr. Eng., Associate Prof., Prof., Dept. of Materials Processing Technologies, e-mail: e.golubchik@magtu.ru

To design technologies for the production of rolled pipes in plate mills, a new methodological approach has been developed and implemented, which allows taking into account the wide variety and combination of consumer properties of products. This system approach is based on the concept of technological compensation and makes it possible to unify the procedures for calculating and constructing basic technological operations, taking into account various aspects characteristic of each steel grade. It consists in searching for the most effective compensatory influence on the system through a set of technological parameters of temperature-strain processing of a metal sheet in order to ensure the required mechanical properties of the product. The application of the proposed methodology is considered using the example of the production of thick plates from micro-alloyed pipe steels of strength classes K56–K65. To determine the required level of compensatory technological impacts, a complex of mathematical and physical models has been formed. Rational technological parameters of thick plate controlled rolling have been determined to compensate for the targeted reduction in the content of expensive alloying elements in pipe steels by 2–4 times. When thick-sheet rolling of continuously cast slabs with surface defects-cracks, compensating technological modes have been developed to reduce the amount of cutting of the side edges of the sheet. The effect is achieved by reducing the elongation coefficient when dividing the width, reducing the shape parameter of the deformation zone, as well as the use of a compensating transverse rolling scheme. When thick-sheet rolling of continuously cast slabs with a temperature gradient along the thickness, compensating modes of asymmetric mismatch of roll speeds of up to 15 % have been determined, which allows minimizing the ski effect in the front section of the roll.
The study was supported by the Russian Science Foundation grant No. 23-79-30015, https://rscf.ru/project/23-79-30015/.

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