Effect of thermomechanical factors on the properties of steel 15GFB

Such factors of thermomechanical treatment as the number of deformations, the length of time between them, and the temperature at the end of deformation are important in determining the optimum parameters of controlled rolling. Studies have shown that in order to obtain steel with a fine-grained ferritic-pearlitic structure having a developed substructure, it is necessary to repeatedly deform the semifinished product 15–33% in each pass within the temperature range 800–1150°C. Controlled rolling of the investigated low-alloy steel in the two-phase region ensures that the finished steel will have high strength characteristics.