INVESTIGATION OF THE INFLUENCE OF TECHNOLOGICAL FACTORS IN THE SMELTING OF LOW-ALLOY STEEL ON RESISTANCE TO HYDROGEN CRACKING

In the last decade, the oil and gas industry has been in dire need of seamless steel pipes resistant to corrosion destruction, which is associated with the development of oil production containing large amounts of hydrogen sulfide and other aggressive impurities. A key role in achieving high indicators of resistance to hydrogen cracking is given to the development and use of methods for controlling the type, quantity, size and morphology of non-metallic inclusions, forms of impurity presence, precipitation of non-metallic excess phases or strengthening structural components. The authors analyzed the current technology for smelting and casting of 13HFA steel at the KSP Steel PB LLP enterprise and developed a set of technological measures for smelting, extra-furnace treatment and casting of 13HFA steel, ensuring a high level of resistance to hydrogen cracking. A series of melts carried out according to the developed technological indicators ensured the achievement of the main HIC indicators at the level of CLR and CTR = 0 %. The research was conducted within the framework of grant funding from the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan under the competition for grant funding for scientific and (or) scientific and technical projects for 2024–2026 under the project AP23487674 «Complex processing of bauxites of Kazakhstan with additional extraction of iron by alternative reducing agents in the implementation of the low-carbon development strategy». Keywords: low-alloy steel, hydrogen cracking, smelting, out-of-furnace processing, continuous casting.