Applied Physics and Mathematics Annotation << Back INCREASING THE STRUCTURAL STRENGTH OF BARREL BLANKS DUE TO GRADIENT HOLIDAY THROUGH THE WALL THICKNESS V.B. DEMENTEV, S.D. SOLOVYOV, M.Yu. STERKHOV, A.A. SUKHIKH The article discusses the technology of obtaining hollow cylindrical parts with hardening of the outer surface and the distribution of hardness and strength along the wall thickness to the inner surface, which is achieved by using a technological method such as hardening with high frequency heating (HFC). The technology of heat treatment for a complex of mechanical properties that varies along the thickness of the barrel wall includes through hardening of the wall during high-temperature thermomechanical treatment (HTMT) and subsequent gradient tempering. Carrying out HTMT in comparison with conventional hardening (from high-frequency heating or furnace heating) allows obtaining a higher complex of mechanical properties of the material. The purpose of this work is to study the effectiveness of hardening barrel blanks by high-temperature thermomechanical treatment with gradient tempering from a number of barrel steels. Keywords: gradient tempering, polygonal substructure, martensite, hardening, pipe blanks. DOI: 10.25791/pfim.04.2023.1272 Pp. 73-80.