Abstract
The susceptibility to stress-corrosion cracking of the pipe metal of a long-term operated for 40 years main gas pipeline made of X70 steel and an emergency reserve pipe during cathodic protection in NS4 was investigated. A tendency towards some increase in susceptibility to stress corrosion cracking at a potential shift of -0.75 to -1.05 V was found for the serviced pipe compared to stock pipe metal. It is shown that the value of KS is slightly higher for the operated pipe, which indicates the possible embrittlement of the steel with long-term exposure to external cathodic polarization.
Publisher
Karpenko Physico-Mechanical Institute of the NAS of Ukraine
Reference7 articles.
1. 1. Nykyforchyn H. In-service degradation of pipeline steels. In Degradation assessment and failure prevention of pipeline systems. Switzerland: Springer Int. Publ., 2021. - P. 15-29.
2. 2. Semenov S. E., Rybakov A.A., Kirian V.I., Filipchuk T.N., Goncharenko L.V., Vasilyuk V.M. and Vlasyuk F.S. Experimental evaluation of the state of metal of long-serviced welded oil pipelines // The Paton welding journal. - 2001. - 5. - P. 17-21.
3. 3. Semyonov S.E., Rybakov A.A., Goncharenko L.V., Filipchuk T.N., Drogomiretsky M.N. and Pedko B.I. Evaluation of condition of metal of welded pipes of long-operated gas pipelines // The Paton welding journal. - 2003. - 4. - P. 2-6.
4. 4. Nyrkova L.I., Rybakov A.O., Goncharenko L.V., Osadchuk and Kharchenko Yu.O., Analysis of the causes of fracture of the main gas pipeline // Zastita materijala. - 2023. - 2. - P. 177-186.
5. 5. Nyrkova L. I., Goncharenko L. V., Rybakov A. O., Osadchuk S. O., Klymenko A. V. and Kharchenko Y. O. Investigation of welded joints of long-term operated gas pipeline controllable rolled X70 steel // FME Transactions. - 2023. - 51, №. 1. - P. 71-80.