The theory of the use of structures made of rolled stock of large thickness, the methodology for assessing the quality of plates and the peculiarities of their operation in structures are considered. Dependence of properties of thick sheets on alloying, heat treatment and peculiarities of production are analyzed. The behavior of steel in the manufacture and operation of structures is described. The properties of new generation steels for rolled products of large thickness were discussed. Examples of the use of these materials in the latest unique structures are given.