Perm National Research Polytechnic University (Perm, Russia)

O. V. Silina, Cand. Eng., Associate Prof., Dept. of Metal Science, Thermal and Laser Processing of Metals, silina-olga@mail.ru
I. V. Matalasova, Postgraduate Student, Sept. of Metal Science, Thermal and Laser Processing of Metals, gi@elkam.ru

Physical-Technical Institute of the National Academy of Sciences of Belarus (Minsk, Belarus)

M. N. Bosyakov, Cand. Phys.-Math., Associate Prof., Leading Researcher, plasma.by.metal@gmail.com

ELKAM-Neftemash (Perm, Russia)

R. M. Polezhaev, Technical Director, prm@elkam.ru

The paper presents the results of hardening treatment by ion nitriding of stainless steel 08Kh17T. The research was carried out in order to identify the suitability of this steel as a material for the liner of bimetallic tubing for borehole pumps. Tubing works in conditions of intense abrasive wear, exposure to corrosive components (hydrogen sulfide, carbon dioxide, mineralized water), as well as alternating and shock loads. The influence of processing modes on the formation of a nitrided layer and the corrosion resistance of 08Kh17Т steel in its initial state and after cold radial forging with varying degrees of forging is shown. It has been established that ionic nitriding of 08Kh17Т steel ensures the production of hardened layers in accordance with the quality requirements of the inner surface of tubing. The influence of the activity of the gaseous medium (PN2) as the main technological parameter affecting the quality of the diffusion layer is considered. It is shown how the nitrogen (PN2) flux density affects the surface hardness, layer depth, and phase composition. It has been found that at high values of nitrogen flux density, the surface hardness increases with an increase in the degree of deformation. The structure and properties of the obtained layers are investigated. The phase composition of the surface of all the studied samples was analyzed. Comparative tests of the corrosion resistance of nitrided layers obtained on 08Kh17Т and 38Kh2MYuА steels have been carried out. It has been established that the corrosion rate of deformed nitrided steels (08Kh17Т and 38H2MYA) corresponds to the same level of resistance.

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