2411-3336 2541-9404 Записки Горного института Journal of Mining Institute Санкт-Петербургский горный университет императрицы Екатерины ΙΙ Empress Catherine II Saint Petersburg Mining University 10.31897/PMI.2021.3.8 pmi-14729 https://pmi.spmi.ru/pmi/article/view/14729 Металлургия и обогащение Metallurgy and concentration Influence of heat treatment on the microstructure of steel coils of a heating tube furnace Влияние термической обработки на микроструктуру стальных змеевиков нагревательной трубчатой печи Bazhin Vladimir Yu. Бажин В. Ю. Bazhin Vladimir Yu. bazhin-alfoil@mail.ru 0000-0001-8231-3833 Санкт-Петербургский горный университет (Санкт-Петербург, Россия) Saint Petersburg Mining University (Saint Petersburg, Russia) Issa Bashar Исса Башар Issa Bashar basharissashtain@gmail.com 0000-0002-7612-7599 Санкт-Петербургский горный университет (Санкт-Петербург, Россия) Saint Petersburg Mining University (Saint Petersburg, Russia) 20 09 2021 2021 249 393 400 10 03 2021 21 05 2021 20 09 2021 © 2021 В. Ю. Бажин, Башар Исса © 2021 Vladimir Yu. Bazhin, Bashar Issa 2021 В. Ю. Бажин, Башар Исса Vladimir Yu. Bazhin, Bashar Issa Эта статья доступна по лицензии Creative Commons Attribution 4.0 International (CC BY 4.0) This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0) https://pmi.spmi.ru/pmi/article/view/14729

При транспортировке и переработке тяжелой металлоносной нефти возникают проблемы с локальными разрушениями металлических конструкций и элементов из-за процессов коррозии. Во время эксплуатации оборудования выявлено, что преждевременный выход из строя стальных змеевиков нагревательных трубчатых печей на нефтеперерабатывающих и нефтехимических заводах связан с недостаточной прочностью и коррозионной стойкостью стальных конструкций. Изучение влияния структуры и фазового состава стальных элементов из сплава 15Х5М нагревательных печей нефтеперерабатывающего производства на коррозионные свойства, связанные с потерей массы и локальными разрушениями во время термообработки, позволяет разработать условия защиты и определить режимы нагрева с лимитирующей стадией скорости окисления. Скорость различных типов коррозии стали марки 15Х5М используется в качестве показателя для оценки эффективности примененных режимов термических обработок змеевиков с целью повышения коррозионной стойкости и улучшения их эксплуатационных характеристик. Проведенные эксперименты по термообработке некоторых участков стальных змеевиков позволили определить рациональные режимы нагрева исследуемых змеевиков, что позволяет снизить потерю их массы и повысить коррозионную стойкость рабочих поверхностей во время эксплуатации. Предлагаемый вариант термообработки стальных змеевиков в заданные промежутки времени их работы в трубчатых печах создает условия для устойчивой эксплуатации и влияет на степень промышленной и экологической безопасности при снижении материальных затрат, связанных с ремонтом и заменой отдельных узлов и деталей трубчатых печей.

Transportation and refining of heavy metal-bearing oil are associated with the problems of localized destruction of metal structures and elements due to corrosion. In the process of equipment operation, it was revealed that premature failure of steel coils of heating tube furnaces at oil refineries and petrochemical plants was associated with insufficient strength and corrosion resistance of the steelwork. The study of the effect that structure and phase composition of 15KH5M-alloy steel elements of heating furnaces at oil refineries have on the corrosion properties, associated with mass loss and localized destructions in the process of heat treatment, allows to develop protective measures and determine heating modes with a rate-limiting step of oxidation. The rate of various corrosion types of 15KH5M steel is used as an indicator to assess the effectiveness of the applied modes of coil heat treatment in order to increase their corrosion resistance and improve their operational characteristics. Conducted experiments on heat treatment of certain steel coil sections allowed to determine rational heating modes for the studied coils, which made it possible to reduce their mass loss and increase corrosion resistance of working surfaces in the process of operation. Proposed heat treatment of steel coils at specified intervals of their operation in the tube furnaces creates conditions for their stable performance and affects the degree of industrial and environmental safety, as well as reduces material costs associated with the repair and replacement of individual assemblies and parts of tube furnaces.

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