Abstract
In the present investigation, the fracture-resistance test results of modern structural steels of the grades 22K (USSR), Creselso 330E (France), 19MN5 (Japan), and their weldments have been extensively studied under test conditions simulating the service operation of Dy752 pipings of NPP with reactors of the BWR type. The low-cycle fatigue-resistance and crack-growth rate of the material have been evaluated in the operational-temperature range of 20–350°C, together with the fracture-toughness values, with the use of the brittle-crack-initiation criterion. It has been shown that all the characteristics of the materials investigated, reflecting the various stages of the fracture process, are very close in their values, and, to predict the service life of such pipings, the corresponding correlations given in the USSR standard PNAE G-7-002-86 may be used.
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