Nosov Magnitogorsk State University, Magnitogorsk, Russia

P. P. Poletskov, Dr. Eng., Prof., Dept. of Metal Forming named after M. I. Boyarshinov
Yu. Yu. Efimova, Cand. Eng., Associate Prof., Dept. of Foundry Processes and Material Science
A. S. Kuznetsova, Cand. Eng., Associate Prof., Engineering Center, e-mail: allakuznetsova.mgtu@mail.ru
D. Yu. Alekseev, Cand. Eng., Engineer, Engineering Center

The long-term work experience of the scientists of Nosov Magnitogorsk State Technical University made it possible to develop alloying systems and heat treatment modes that ensure a given level of mechanical properties, as well as to master innovative technologies for the production of four types of rolled metal from cold-resistant high-strength steels. The paper presents the results of the development of new cold-resistant high-strength steels for their multipurpose use in various branches of technology. It has been established that the steels of two alloying systems after quenching, as well as after quenching with subsequent tempering, provide a set of difficult-to-combine mechanical properties defined for four types of materials: 1) σ_в = 580-950 MPa and KСV-70 ≥100 J/cm² after quenching from 860 °C and tempering at 600 °C; 2) σв = 950-1200 MPa and KСV-70 ≥50 J/cm² after quenching from 860 °C and tempering at 500 °C; 3) σ_в = 1200-1500 MPa and KСV-70 ≥30 J/cm² after quenching from 860 °C; 4) σв ≥1500 MPa and KСV-70 ≥25 J/cm² after quenching from 910 °C. It was established that the heat treatment mode – quenching – provides the highest values of cold resistance (KСV-70 ~ up to 50 J/cm²) for steel with the maximum content of elements, mass. %: 0.23С-0.3Si-1.2Mn-2.4(Ni+Cu+Mo)-0.03Ti-0.005B, due to the increased content of (Ni + Cu + Mo); and the mode – quenching with high tempering – allows achieving the value of cold resistance (KСV-70 ~ up to 250 J/cm²) for steel, mass.: 0.24С-0.6Si-1.6Mn-0.3(Ni+Cu+Mo)-0.005B, due to a more complete destruction of the rack structure of the α-phase in the microstructure and the course of the spheroidization process.
The study was conducted at the Federal State Budgetary Educational Institution of Higher Education "Nosov Magnitogorsk State Technical University at the expense of the grant of the Russian Science Foundation No. 23-19-20018 dated 04/20/2023, as well as funds from the Ministry of Education and Science of the Chelyabinsk Region (Agreement No. 30-2025-002767 dated 07/07/2025), https://rscf.ru/project/23-19-20018/.

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