Empress Catherine II Saint Petersburg Mining University (Saint Petersburg, Russia)

V. B. Kuskov, Cand. Eng., Associate Prof., Dept. of Mineral Processing, e-mail: Kuskov_VB@pers.spmi.ru
E. S. Iliin, Ph. D. Student, Dept. of Mineral Processing, e-mail: s235069@stud.spmi.ru

Ferrum is the metal which is mostly used by people. Our usual life is impossible in conventional way without ferrum. Ferrum is also the base for iron and steel, and steel is the most widely used construction material for the industries. The properties of this material are very important and steel application areas are determined depending on these properties. Different methods of steel processing are used for improvement of its quality. One of this methods is presented by heat treatment, in particular – thermal cycling, which allows to improve substantially mechanical properties of steel. There are many variants of heat treatment for steels, however, thermal cycling has still large field for further investigations. Based on the modern technical level, heat treatment processes can be carried out with heating rate varying from parts of grades per second to hundreds of grades per second. It is also possible to vary number of heating and cooling cycles, what has significant effect on mechanical properties of processed steel. Additionally, the processes after heat treatment provide apparent influence on these properties. Mechanical steel processing after conducted heat treatment also has the effect on steel properties. Conduction of metal processing according to incorrect operating modes can have very negative consequences for steel properties. Wrong operation with material can seriously deteriorate obtained steel properties after heat treatment. The paper presents the experiences of thermal cycling of ShKh-15 steel and the conditions allowing to obtain optimal steel strength properties are determined.

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