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—Low-alloy shipbuilding and pipeline steels are currently supplied after thermomechanical treatment, in which a ferrite–pearlite or ferrite–bainite structure depending on alloying is formed. During the thermomechanical treatment and then during cooling, a large number of defects are developed and recorded, which makes the crystalline structure nonequilibrium and leads to a nonuniform distribution of carbon and nitrogen atoms. The properties of steel with a nonequilibrium structure may degrade during processing treatments (cold straightening, bending, welding) and during exploitation or long-term storage. The effects of the modes of strain aging on the mechanism of steel fracture are studied and efficient ways to prevent embrittlement caused by aging are sought.