National Research Center (NRC) “Kurchatov Institute” - Central Research Institute of Structural Materials “Prometey” (St. Petersburg, Russia)

S. D. Ruzaev, 2nd Category Engineer, mail@crism.ru
O. A. Kharkov, Cand. Eng., Head of Sector
G. Yu. Kalinin, Dr. Eng., Associate Prof., Head of Laboratory

Empress Catherine II St. Petersburg Mining University (St. Petersburg, Russia)
Ya. E. Gekht, Student., Dept. of Metallurgy and Artistic Products Technology, jangech95@gmail.com

The subject of the research was corrosion-resistant steel of the austenitic-martensitic class with varying content of alloying elements: Ni, Cu, Mn, N. In the course of the work, tests were conducted on laboratory-melted samples of experimental corrosion-resistant steel 04Kh16N5GMFABD, aimed at determining a set of mechanical characteristics. Based on the results of the mechanical tests, the fundamental technological feasibility of producing high-strength corrosion-resistant steel based on the studied chemical composition was established. The obtained data confirm that the material is capable of consistently providing a tensile strength level of at least 1000 MPa in 15 mm thick rolled sheets, which meets the requirements for modern highly loaded structural elements. Using X-ray diffraction analysis, the amount of retained austenite in rolled sheets from different melts was determined. Metallographic studies were carried out in conjunction with studies to determine non-metallic inclusions. The negative influence of nonmetallic inclusions, especially plate-like silicates, on impact toughness was shown, and proposals were made for their significant reduction during the steel melting process.

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