OBRABOTKA METALLOV

Introduction: Equipment using at hazardous production facilities is in most cases made of the structural steels, which are subject to severe corrosion damage in contact with aggressive environments. In aggressive environments, the process of corrosion destruction of the material has a multi-component nature. The multicomponent nature of corrosion processes still leaves the question as to what factors have a greater effect on the process of corrosion. In the literature, the size of the grain structure is indicated as the main corrosion-determining factor. However, in addition to the sizes of the grain, corrosion is also affected by the corresponding factor of grain size variation, characterizing the dispersion of the system as a whole.  Therefore, differentiation of factors affecting the course of corrosion processes remains an urgent problem. Purpose: To analyze the possibility of using the grain size variation factor as a diagnostic parameter for determining the rate of the corrosive destruction of structural steel. In article were studied a heat-treated steel samples 15HSND, 09G2S and St3 made from rolled steel. Methods of research: For the study of steels 15KHSND, St3 and 09G2S was applied in the work: scanning electron and optical microscopes-to study the grain structure and intergranular boundaries; SIAMS 700 software package-to find the boundaries and average statistical data on the grain structure; a portable x-ray fluorescence chemical analyzer-to determine the chemical composition of the samples under study; laboratory balance with a measurement error of 0.001 g – to measure the mass of the samples. Results and Discussion: It is established that for the rate of corrosion of structural steels and the factor of heterogeneity, a single satisfactory linear correlation is observed, which can be used to predict the corrosion-hazardous States of structures. It is noted that the loss of some values from the General regression curve can be associated with the processes of reducing distortions in the crystal lattices of steel during a certain heat treatment. The severity of these processes for the considered steels may be different due to the presence of different amounts of alloying elements in their composition.

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