The Influence of the High Temperature Annealing on the Small Impurities Segregation in J24056 Grain Steel

In the process of constructional steel products operation in conditions of high temperatures, chemical elements segregation occurs, which leads to the surface characteristics changing and influences their operation period. This paper is aimed in developing the model of mass transfer and redistribution of small-sized atoms (carbon, oxygen) in the binary system “steel-coating” after high temperature annealing in air atmosphere. It is estimated, that carbon concentration inside the grain increases up to 2.81%, at the grain boundaries it reaches 0.44%, while oxygen concentration increases in average up to 16%. The main mechanisms, leading to the redistribution of small-sized impurities, are non-equilibrium flows of point defects to the surface and grains boundaries.