**2. Relationship between corrosion resistance of austenitic chromium-nickel steels AISI 304, 08Cr18Ni10, AISI 321, 08Cr18Ni10Ti (contain low amount of δ-ferrite) and paramagnetic state of austenite**

Despite numerous studies of corrosion processes of various materials [1–4], the problems that arise require a comprehensive study of the mechanisms of corrosion behavior to ensure reliable and safe operation of modern structural materials. It should be noted that even in one smelter of industrial steel δ-ferrite is distributed unevenly, for example for steel 08Cr18Ni10Ti—the width of the sheet perpendicular to the rolling the amount of δ-ferrite varied from 0.01% to 0.4%. Chromiumnickel austenitic steels contain little δ-ferrite, which due to the small contact surface cannot significantly affect the corrosion behavior of austenitic steels [5]. We can assume that corrosion is affected by the pre-formed atomic-magnetic state of the whole austenitic matrix (austenite), which is characterized by the sum of magnetic moments of atoms per unit mass (specific magnetization) and described by an external parameter—specific magnetic susceptibility χ0. In [6] it was noted that the presence of a low content of δ-phase (*P*<sup>δ</sup> < 2%) in steel 12Х18Н10Т is not detected by radiography, metallographic methods show its presence, and the phase content was determined by the magnitude of the magnetization.

To study the dependence of corrosion resistance on the paramagnetic state of the austenitic matrix (parameter χ0) and evaluate the effect of low δ-ferrite content on
