blackmetИзвестия высших учебных заведений. Черная МеталлургияIzvestiya. Ferrous Metallurgy0368-07972410-2091National University of Science and Technology "MISIS"10.17073/0368-0797-2020-10-782-790blackmet-1991Research ArticleПо итогам Международной научной конференции «ФИЗИКО-ХИМИЧЕСКИЕ ОСНОВЫ МЕТАЛЛУРГИЧЕСКИХ ПРОЦЕССОВ» им. академика А.М. САМАРИНА, Москва, 25 – 28 ноября 2019 г.Futher to the International Scientific Conference “PHYSICO-CHEMICAL BASES OF METALLURGICAL PROCESSES” named after Academician A.M. SAMARIN, Moscow, November 25 – 28, 2019Контроль оксидных неметаллических включений в процессе производства IF сталиControl of oxide non-metallic inclusions in production of IF steelМорозовА. О.MorozovA. O.

инженер-исследователь лаборатории диагностики материалов

119049, Россия, Москва, Ленинский пр., 4

119991, Россия, Москва, Ленинский пр., 49

Research Engineer of the Laboratory of Materials Diagnostics

Moscow

ПогодинА. М.PogodinA. M.

младший научный сотрудник лаборатории диагностики материалов

119049, Россия, Москва, Ленинский пр., 4

119991, Россия, Москва, Ленинский пр., 49

Junior Researcher of the Laboratory of Materials Diagnostics

Moscow

КомоловаО. А.KomolovaO. A.

к.т.н., доцент кафедры металлургии стали, новых производственных технологий и защиты металлов, старший научный сотрудник лаборатории диагностики материалов

(119049, Россия, Москва, Ленинский пр., 4

119991, Россия, Москва, Ленинский пр., 49

 

Cand. Sci. (Eng.), Assist. Professor of the Chair of Metallurgy of Steel, New Production Technologies and Metal Protection, Senior Researcher of the Laboratory of Materials Diagnostics

Moscow

 

o.a.komolova@gmail.comБикинК. Б.BikinK. B.

ведущий эксперт

162608, Россия, Вологодская обл., Череповец, ул. Мира, 30

Leading Expert

Vologda Region

kbbikin@severstal.comГригоровичК. В.GrigorovichK. V.

академик РАН, д.т.н., профессор кафедры металлургии стали, новых производственных технологий и защиты металлов, заведующий лабораторией диагностики материалов

119049, Россия, Москва, Ленинский пр., 4

119991, Россия, Москва, Ленинский пр., 49

Academician, Dr. Sci. (Eng.), Professor of the Chair of Metallurgy of Steel, New Production Technologies and Metal Protection, Head of the Laboratory of Materials Diagnostics

Moscow

Национальный исследовательский технологический университет «МИСиС»; Институт металлургии и материаловедения имени А.А. Байкова РАНРоссияNational University of Science and Technology “MISIS” (MISIS); Baikov Institute of Metallurgy and Materials Science, RASRussian FederationПАО «Северсталь»РоссияJSC “Severstal”, CherepovetsRussian Federation2020091220206310782790Copyright © Морозов А.О., Погодин А.М., Комолова О.А., Бикин К.Б., Григорович К.В., 20202020Морозов А.О., Погодин А.М., Комолова О.А., Бикин К.Б., Григорович К.В.Morozov A.O., Pogodin A.M., Komolova O.A., Bikin K.B., Grigorovich K.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://fermet.misis.ru/jour/article/view/1991

Современные тенденции в автомобилестроении направлены на снижение массы автомобиля и повышение его безопасности. Высокая пластичность IF-BH стали в сочетании с повышенной прочностью позволяет использовать прокат меньшей толщины в конструкции кузова автомобиля. Достижение высоких пластических свойств в IF-BH стали обеспечивается низким содержанием азота и углерода (C < 40 ppm, N < 40 ppm) и контролируемым содержанием углерода в твердом растворе. Возникновение большинства дефектов поверхности листа связано с неметаллическими включениями. Присутствие неметаллических включений в готовой продукции нарушает ее однородность, ухудшает поверхностные свойства стали, усталостную прочность и пластические характеристики металла. В результате выполнения работы методами микрорентгеноспектрального и фракционного газового анализа на растровом электронном микроскопе проанализированы образцы металла трех плавок IF-BH стали, отобранные по всей технологической цепочке производства в СП КС ПАО «Северсталь». Количественно определены основные типы оксидных неметаллических включений, находящихся в стали, а также общее содержание кислорода и азота в металле. Показано, что основными типами оксидных неметаллических включений в исследованных пробах металла являются алюминаты, силикаты и шпинель. Установлены два места с возможным вторичным окислением после ввода алюминия. Между пробами наблюдали заметный прирост азота, что свидетельствовало о вторичном окислении металла. При этом возрастало содержание включений алюминатов в металле и снижалось количество включений алюмомагниевой шпинели. Разработана математическая модель и программное обеспечение, описывающее процесс образования и удаления оксидных неметаллических включений. Адекватность программы подтверждена хорошей сходимостью между расчетными и экспериментальными данными по общему содержанию [O] в различных типах оксидов для первой пробы на установке ковш-печь и в слябе.

Modern trends in the automotive industry are aimed at reducing vehicle weight and increasing its safety. The high ductility of IF-BH steel in combination with increased strength allows the use of thinner rolled products in the car body structure. Achievement of high plastic properties in IF-BH steel is ensured by the low content of nitrogen and carbon (C <40 ppm, N <40 ppm) and controlled carbon content in the solid solution. The majority of sheet surface defects are associated with non-metallic inclusions. The presence of non-metallic inclusions in the finished product violates its homogeneity, deteriorates the surface properties of steel, fatigue strength and plastic characteristics of the metal. As a result of the work performed by the methods of fractional gas and micro-X-ray spectral analysis on a scanning electron microscope, metal samples of three IF-BH steel melts were analyzed, taken along the entire process chain of production. The main types of oxide non-metallic inclusions in the steel were quantitatively determined, as well as the total oxygen and nitrogen content in the metal. It is shown that the main types of oxide non-metallic inclusions in the investigated metal samples are aluminates, silicates and spinel. An increase in nitrogen content in the metal after breakdown of the vacuum on the VD was established, which indicates secondary oxidation of the metal. In metal of the samples in the section between the tundish and the crystallizer, nitrogen content in the metal increases which indicates the secondary metal oxidation. At the same time, the content of inclusions of aluminates in the metal increased and the number of inclusions of aluminum-magnesium spinel decreased. A mathematical model and software have been developed that describe the formation and removal of oxide nonmetallic inclusions. Adequacy of the program was confirmed by good convergence between the calculated and laboratory data on the total content [O] in various types of oxides for the first sample at the ladle-furnace unit and in the slab.

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The authors declare that there are no conflicts of interest present.