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Assessing of resistance to intercrystalline corrosion of 20Kh13 and 40Kh13 steels
https://doi.org/10.26896/1028-6861-2025-91-10-34-41
Abstract
Martensitic steels of the Kh13 type, such as 20Kh13 and 40Kh13, are widely used, for example, in the production of medical instruments. This study presents the results of assessing the susceptibility to intergranular corrosion (IGC) of 20Kh13 and 40Kh13 steels in their initial state (after hot rolling) and after heat treatment (annealing to produce granular pearlite) using the AMUF accelerated test method. The microstructure was analyzed using scanning electron microscopy, along with the chemical composition and hardness of the investigated steels. It was found that after annealing, 20Kh13 steel exhibits a higher susceptibility to IGC compared to 40Kh13, despite their similar structural characteristics. This is attributed to differences in the morphology of the carbide phase — smaller and more uniformly distributed carbides in 40Kh13 provide better corrosion resistance. The obtained results can be used to improve the methodology for evaluating the susceptibility of martensitic steels to IGC, thereby enabling more reliable quality assessment of medical instruments and predicting their service life.
About the Authors
Yu. S. Mordovina
R. E. Alekseev Nizhny Novgorod State Technical University
Russian Federation
Russian Federation
Yuliya S. Mordovina.
24, ul. Minina, Nizhny Novgorod, 603155.
M. A. Chernigin
R. E. Alekseev Nizhny Novgorod State Technical University
Russian Federation
Russian Federation
Mikhail A. Chernigin.
24, ul. Minina, Nizhny Novgorod, 603155.
M. E. Fedosova
Dzerzhinsk Polytechnic Institute (branch)
Russian Federation
Russian Federation
Marina E. Fedosova.
49, ul. Gaydara, Dzerzhinsk, Nizhegorodskaya obl., 606026.
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Review
For citations:
Mordovina Yu.S., Chernigin M.A., Fedosova M.E. Assessing of resistance to intercrystalline corrosion of 20Kh13 and 40Kh13 steels. Industrial laboratory. Diagnostics of materials. 2025;91(10):34-41. (In Russ.) https://doi.org/10.26896/1028-6861-2025-91-10-34-41
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