LABORATORY AND OPERATING TESTING OF HIGH-ALLOY STEEL PIPES MADE BY THE LATEST TECHNOLOGIES

The purpose of the research: evaluation quality and durability for pipes made high-alloyed austenitic ferritic-austenitic steels, which are manufactured at PJSC "CENTRAVIS PRODUCTION UKRAINE" using latest technologies, by conducting complex laboratory studies long-term operational tests chemical industry enterprises. Materials methods: research materials were experimental chromium-nickel-molybdenum steels new generation, technologies. microstructure was investigated metallography electron microscopy developed improved methods. Corrosive researches in terms included a test on firmness against local types corrosion inherent high-alloy steels: intergranular (IGC), pitting (PC), cracking (CC) sulfide stress (SSCC). mechanical properties determined tensile impact bending tests. Long-term carried out conditions industrial production enterprises apparatus urea caustic soda production. Research results: A high content special low-energy grain boundaries theory coincident nodes’ lattices (SG CSL) established structure according to technologies (≥ 75 %); resistance various most dangerous compared existing analogues, level properties, as well during environments implementation obtained results will contribute increasing efficiency operation highly alloyed steel demand world market competitiveness domestically produced European markets.