Review article

It has been established that the strength properties of structural steels 08, 10, 20, St3, 09G2S and 10HSND substantially depend on the mode of thermal and thermal-cycle processing (TP). Increasing the number of TP cycles to 3-6 significantly increases the strength of the metal in relation to high-temperature annealing and normalization. With a further increase in the number of cycles, the process of increasing the strength of the metal slows down. The presence of alloying elements in steels, reducing the thermodynamic activity of carbon, slows down the structural transformations of the metal, which requires for them to be activated, in comparison with carbon steels, the increase of the thermal cycling temperature, or the increase of the number of cycles. The effect of increasing the strength properties of the metal in the process of the controlled TP including the application of passive ferro-probe technique can be used in case of the dangerous local stress concentration zones strengthening in welded joints and elements of welded metal structures.