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.

中文翻译：

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评价管钢腐蚀开裂敏感性的方法和标准

在模拟各种应力腐蚀因素组合影响的条件下，分析了Kh70管钢试样应力腐蚀断裂的具体特征。为了评估钢对应力腐蚀开裂 (SCC) 的敏感性，我们建议使用无量纲系数 Ks，该系数等于试样在空气中的相对变窄与其在溶液中的相对变窄之比。我们引入以下评价标准：如果系数 Ks 等于或大于 1.6，则钢易发生 SCC。