Ural Federal University named after the first President of Russia B.N. Yeltsin, Ekaterinburg, Russia:

D. A. Pumpyansky, Dr. Econ., Chairman of the Supervisory Board

JSC Chepetsky Mechanical Plant, Glazov, Russia:
M. G. Shtuza, Dr. Eng., Deputy Technical Director

JSC The Russian Research Institute of the Tube & Pipe Industries, Chelyabinsk, Russia¹ ; PJSC Pipe Metallurgical Company, Moscow, Russia²:
I. Yu. Pyshmintsev, Dr. Eng., General Director¹, Director for Research²

JSC The Russian Research Institute of the Tube & Pipe Industries, Chelyabinsk, Russia:
Ya. I. Kosmatsky, Dr. Eng., Deputy General Director for Research, e-mail: kosmatski@rosniti.ru
O. V. Varnak, Cand. Eng., Head of the Laboratory for Metal Science and Heat Treatment
B. V. Barichko, Cand. Eng., Leading Researcher, Laboratory of Drawing and Pressing

The main results of the development of a technology for the production of special types of pipe products, carried out taking into account the features of the microstructure, the laws of phase and structural transformations, as well as the resistance to plastic deformation in a wide temperature range of steels of the ferritic-martensitic class of grades EP450-Sh and EP823-Sh, are presented. The microstructure was studied with determination of the grain size, the content of non-metallic inclusions and fraction of the main structural components depending on the heating temperature for quenching. Using the Gleeble 3800 multifunctional complex, the resistance to fracture deformation at high temperatures was determined. In the laboratory of JSC RusNITI, physical modeling of the cold rolling process in a two-roll stand was carried out according to the oval-oval calibration scheme in the mode of successive increase in reduction. On the basis of the studies carried out for the steel grades under study, were developed the modes for pressing stock hot-pressed pipes with dimensions of 133.0×14.0 and 89.0×7.0 mm; cold rolling of both large-scale samples of round pipes and stock pipes intended for subsequent production of hexagonal pipes; final heat treatment of pipes of round and hexagonal sections, ensuring compliance with the requirements of technical specifications. As part of the project direction, PJSC TMK developed and implemented, through inter-plant cooperation with JSC VTZ, TMK-INOKS Ltd. and JSC RusNITI, a new technology for manufacturing hexagonal pipes according to the hot pressing – cold deformation scheme (rolling, profiling), whereby large-scale samples of new types of pipes for special purposes were obtained from EP450-Sh and EP823-Sh steel grades. The results obtained are used to form a set of technical requirements for the new type of high-tech pipe products, presented in technical specifications TU 420-2021, TU 422-2021, TU 423–2021.

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