Assessment of the possibility of resistance butt welding of pipes made of heat-resistant steel 0.15C-5Cr-Mo

OBRABOTKAMETALLOV technology Vol. 26 No. 3 2024 2. It is shown that hardness is an important indicator reflecting changes in the microstructure in the welded joint. Changes in strength show a positive correlation with changes in hardness, while changes in ductility show a negative correlation with changes in hardness. Thus, hardness testing can be used in engineering applications to evaluate the effectiveness of post-weld heat treatment in improving the properties of a welded joint. 3. To obtain the required mechanical properties of welded joints of pipes made of steel 0.15C-5Cr-Mo welded by resistance butt welding, it is necessary to carry out local heat treatment according to tempering modes or normalization with tempering. References 1. Wen J.-b., Zhou C.-Y., Li X., Pan X.-M., Chang L., Zhang G.-D., Xue F., Zhao Y.-F. Effect of temperature range on thermal-mechanical fatigue properties of P92 steel and fatigue life prediction with a new cyclic softening model. International Journal of Fatigue, 2019, vol. 129, p. 105226. DOI: 10.1016/j.ijfatigue.2019.105226. 2. Seo W., Suh J., Shim J.H., Lee H.S., Yoo K.B., Choi S. Effect of post-weld heat treatment on the microstructure and hardness of P92 steel in IN740H/P92 dissimilar weld joints. Materials Characterization, 2020, vol. 160, p. 110083. DOI: 10.1016/j.matchar.2019.110083. 3. Kumar A., Pandey C. Some studies on dissimilar welds joint P92 steel and Inconel 617 alloy for AUSC power plant application. International Journal of Pressure Vessels and Piping, 2022, vol. 198, p. 104678. DOI: 10.1016/j. ijpvp.2022.104678. 4. Dak G., Pandey C. A critical review on dissimilar welds joint between martensitic and austenitic steel for power plant application. Journal of Manufacturing Processes, 2020, vol. 58, pp. 377–406. DOI: 10.1016/j. jmapro.2020.08.019. 5. Masuyama F. Low-alloyed steel grades for boilers in ultra-supercritical power plants. Materials for ultrasupercritical and advanced ultra-supercritical power plants. Woodhead Publ., 2017, pp. 53–76. DOI: 10.1016/B9780-08-100552-1.00002-6. 6. Gabrel J., Bendick W., Vandenberghe B., Lefebvre B. Status of development of VM 12 steel for tubular applications in advanced power plants. Energy Materials, 2006, vol. 1 (4), pp. 218–222. DOI: 10.1179/ 174892406X173657. 7. Shigeyama H., Takahashi Y., Siefert J., Parker J. Creep-fatigue life evaluation for grade 91 steels with various origins and service histories. Metals, 2024, vol. 14 (2), p. 148. DOI: 10.3390/met14020148. 8. Halimov A.A., Gharinova N.V., Khalimov A.G., Fairushin A.M. Obespechenie tekhnologicheskoi prochnosti svarnykh soedinenii iz martensitnykh khromistykh stalei tipa 15Kh5M [Ensuring technological strength of welding joints of chromium martensitic steel 15CR5M]. Neftegazovoe delo = Oil and Gas Business, 2012, vol. 10, no. 3, pp. 102–108. (In Russian). 9. Khalimov A.A., Zharinova N.V. Optimizatsiya tekhnologii vysokotemperaturnoi termicheskoi obrabotki svarnykh soedinenii iz khromistykh zharoprochnykh stalei [High-temperature thermal process technology optimization of the welded joints from chromium heat-resistant steels]. Tekhnologiya Mashinostroenya = Technology of Mechanical Engineering, 2009, no. 10, pp. 19–25. 10. GOST 20072–74. Stal’ teploustoichivaya. Tekhnicheskie usloviya [State Standard 20072–74. Heat-resistant steel. Specifications]. Moscow, Standards Publ., 1974. 19 p. 11. RD 153-34.1-003-01. Svarka, termoobrabotka i kontrol’ trubnykh sistem kotlov i truboprovodov pri montazhe i remonte energeticheskogo oborudovaniya (RTM-1s) [Regulating document 153-34.1-003-01. Welding, heat treatment and control of pipe systems of boilers and pipelines during installation and repair of power equipment (RTM1s)]. Approved by the order of the Ministry of Energy of Russia from 02.07.2001. St. Petersburg, DEAN Publ., 2002. 463 p. 12. IskhakovA.R., MedvedevYu.S., KorolevN.M., ZainullinR.S., KhalimovA.G., Kutluev I.M., ChernykhYu.A., Tishkin A.F Poluavtomaticheskaya svarka v srede uglekislogo gaza stali tipa 15Kh5M (vremennaya instruktsiya) [Semi-automatic welding in a carbon dioxide environment for steel type 15Х5М (temporary instructions)]. Moscow, TSINTIkhimneftemash Publ., 1992. 8 p. 13. Ruchnaya elektrodugovaya svarka s regulirovaniem termicheskikh tsiklov konstruktivnykh elementov neftekhimicheskogo oborudovaniya iz zakalivayushchikhsya stalei tipa 15Kh5M [Manual electric arc welding with regulation of thermal cycles of structural elements of petrochemical equipment made of hardening steels of type 15Х5М]. РТМ 26-17-076-87. Moscow, Minkhimmash Publ., 1987. 26 p. (In Russian).

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