Sheets from a pipe steel rolled in the finishing stage of controlled thermomechanical treatment (TMT) above and below the temperature of the start of γ → α transformations are studied. The structures and textures of the specimens are determined by metallographic analysis, and tests for impact bending and tension are performed. It is shown that the structural heterogeneity formed in rolling below A3 affects the structure of the steel substantially after controlled cooling. The structure acquires regions of homogeneous crystallographic texture elongated over the rolling direction, which may become places of propagation of secondary cracks due to the lowest fracture energy. Such processes lower the total running fracture energy in gas pipelines from high-strength steels.