<p>The features of crack propagation near non-metallic inclusions of different types, and possible methods of retardation of their growth by changing loading conditions and applying various treatments, are established for various steels. It is shown that crack propagation is accompanied by its branching on destroyed inclusions and in their clusters, as well as on structural defects of the steel matrix. The plastic sulfide inclusions, localization of relaxation processes in the steel matrix, and changes in the stress state near the inclusion under various loading conditions can retard crack propagation. The influence of local microcomposite structures in the steel matrix obtained by high-energy treatments on the features of crack propagation and retardation near non-metallic inclusions is shown.</p>