Karaganda Technical University (Karaganda, Kazakhstan):

A. Z. Isagulov, Dr. Eng., Executive Director, e-mail: aristotel@kstu.kz
Sv. S. Kvon, Cand. Eng., Prof., Dept. of Nanotechnology and Metallurgy, e-mail: svetlana1311@mail.ru
V. Yu. Kulikov, Cand. Eng., Prof., Dept. of Nanotechnology and Metallurgy, e-mail: mlpikm@mail.ru
A. A. Alina, Doctoral Student, Dept. of Nanotechnology and Metallurgy, e-mail: altynbekovna_21@mail.ru

This article examines the effect of the new deoxidizer on the structure and some properties of steel 30KhN2MA. As an experimental deoxidizer, we used ferrosilicoaluminum FS45A15, obtained according to the technology developed by the Chemical-metallurgucal institute named after Zh. Abishev. For metallographic analysis, the Thixomet Pro program was used, while the grain score of the structure and the index of contamination with non-metallic inclusions were assessed. Based on these data, it can be assumed that changes in the microstructure of steel after using a new deoxidizer will lead to some change in mechanical properties. To test this assumption, the prototype was tested for hardness, strength and wear resistance. All tests were carried out in accordance with the relevant GOST. Steel 30KhN2MA, deoxidized in the usual way, was used as a comparative sample - a standard. Experimental smelting was carried out in a modernized induction furnace of the UIP-25 type, ferrosilicoaluminium was introduced into the furnace a few minutes before the end of smelting. After complete cooling, specimens were cut from the mass of the experimental melting for heat treatment. Heat treatment mode: quenching 860 °C oil, tempering 400 °C air; after heat treatment, thin sections for metallographic analysis were prepared from the prototypes. For metallographic analysis, the Thixomet Pro program was used, while the grain score of the structure and the index of contamination with non-metallic inclusions were assessed. The results of this study show that deoxidation with new ferrosilicoaluminium FS45A15 has a beneficial effect on the formation of a fine-grained structure.

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