Methodical Approach and a Criterion for the Evaluation of the Susceptibility of Pipe Steel to Corrosion Cracking

Specific features of the stress-corrosion fracture of specimens of Kh70 pipe steel are analyzed under the conditions simulating the influence of various combinations of stress-corrosion factors. For the evaluation of the susceptibility of steels to stress-corrosion cracking (SCC), we propose to use a dimensionless coefficient Ks equal to the ratio of the relative narrowing of the specimen in air to its relative narrowing in a solution. We introduce the following evaluation criterion: steel is susceptible to SCC if the coefficient Ks is equal to or greater than 1.6.