Abstract
The paper presents results of a study of the stress corrosion cracking (SCC) processes of lowcarbon low-alloyed steels with different levels of ageing. It is shown that the limit of macroelasticity and the incubation period of the SCC decrease with the increase of the ageing level. This can be explained as follows: the limit of macroelasticity determines the beginning of microplastic flow in the material, actively affecting the process of stress corrosion cracking. Basing on selected test pattern the dependence of the stress corrosion cracking from the ageing level has a three-stage character. Behavior of the chosen characteristic is explained on the grounds of the theory of defects.
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