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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">blackmet</journal-id><journal-title-group><journal-title xml:lang="ru">Известия высших учебных заведений. Черная Металлургия</journal-title><trans-title-group xml:lang="en"><trans-title>Izvestiya. Ferrous Metallurgy</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">0368-0797</issn><issn pub-type="epub">2410-2091</issn><publisher><publisher-name>National University of Science and Technology "MISIS"</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.17073/0368-0797-2021-6-413-419</article-id><article-id custom-type="elpub" pub-id-type="custom">blackmet-2129</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ФИЗИКО-ХИМИЧЕСКИЕ ОСНОВЫ МЕТАЛЛУРГИЧЕСКИХ ПРОЦЕССОВ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>PHYSICO-CHEMICAL BASICS OF METALLURGICAL PROCESSES</subject></subj-group></article-categories><title-group><article-title>Фазовые равновесия, реализующиеся при раскислении  силикостронцием низкоуглеродистого расплава на основе железа</article-title><trans-title-group xml:lang="en"><trans-title>Phase equilibrium occurring during low-carbon iron-based melt deoxidation  with silicostrontium</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-8581-1475</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Макровец</surname><given-names>Л. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Makrovets</surname><given-names>L. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Лариса Александровна Макровец, инженер кафедры материаловедения и физико-химии материалов</p><p>454080, Челябинск, пр. Ленина, 76</p></bio><bio xml:lang="en"><p>Larisa A. Makrovets, Engineer of the Chair of Materials Science and Physical Chemistry of Materials</p><p> 454080 Chelyabinsk, Lenina Ave., 76  </p></bio><email xlink:type="simple">makrovetcla@susu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-9514-3201</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Самойлова</surname><given-names>О. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Samoilova</surname><given-names>O. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Ольга Владимировна Самойлова, к.х.н., старший научный сотрудник, доцент кафедры материаловедения и физико-химии материалов</p><p>454080, Челябинск, пр. Ленина, 76</p></bio><bio xml:lang="en"><p>Olga V. Samoilova, Cand. Sci. (Chem.), Senior Researcher, Assist. Prof. of the Chair of Materials Science and Physical Chemistry of Materials</p><p>454080 Chelyabinsk, Lenina Ave., 76 </p></bio><email xlink:type="simple">samoylova_o@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5535-4875</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Михайлов</surname><given-names>Г. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Mikhailov</surname><given-names>G. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Геннадий Георгиевич Михайлов, д.т.н., профессор кафедры материаловедения и физико-химии материалов</p><p>454080, Челябинск, пр. Ленина, 76</p></bio><bio xml:lang="en"><p>Gennadii G. Mikhailov, Dr. Sci. (Eng.), Prof. of the Chair of Materials Science and Physical Chemistry of Materials</p><p>454080 Chelyabinsk, Lenina Ave., 76 </p></bio><email xlink:type="simple">mikhailovgg@susu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-0825-717X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Бакин</surname><given-names>И. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Bakin</surname><given-names>I. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Игорь Валерьевич Бакин, аспирант кафедры материаловедения и физико-химии материалов; начальник отдела инновации, модернизации и технического развития</p><p>454080, Челябинск, пр. Ленина, 76</p><p>454901, Челябинск, п. Водрем 40, 25</p></bio><bio xml:lang="en"><p>Igor’ V. Bakin, Postgraduate of the Chair of Materials Science and Physical Chemistry of Materials; Head of the Division of Innovation, Modernization and Technical Development</p><p>454080 Chelyabinsk, Lenina Ave., 76 </p><p>454901 Chelyabinsk, 25 Vodrem Vil. – 40</p></bio><email xlink:type="simple">igor.npp.bakin@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Южно-Уральский государственный университет</institution><country>Россия</country></aff><aff xml:lang="en"><institution>South Ural State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Южно-Уральский государственный университет; ООО НПП Технология</institution><country>Россия</country></aff><aff xml:lang="en"><institution>South Ural State University; LLC  RPE Technology</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>18</day><month>07</month><year>2021</year></pub-date><volume>64</volume><issue>6</issue><fpage>413</fpage><lpage>419</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Макровец Л.А., Самойлова О.В., Михайлов Г.Г., Бакин И.В., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Макровец Л.А., Самойлова О.В., Михайлов Г.Г., Бакин И.В.</copyright-holder><copyright-holder xml:lang="en">Makrovets L.A., Samoilova O.V., Mikhailov G.G., Bakin I.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://fermet.misis.ru/jour/article/view/2129">https://fermet.misis.ru/jour/article/view/2129</self-uri><abstract><p>В настоящее время для повышения качества металла, в особенности низколегированного, применяют технологии внепечной обработки стали с использованием комплексных сплавов, в состав которых входят помимо кремния щелочноземельные металлы. Изучение влияния добавок стронция на процессы раскисления и модифицирования жидкой стали является одним из перспективных направлений исследования в области металлургических технологий. Проведено термодинамическое моделирование фазовых равновесий в расплаве системы Fe –Sr–Si–C–O с использованием методики построения поверхности растворимости компонентов в металле. Поверхность растворимости определяет границы стабильности образующихся при раскислении неметаллических фаз в зависимости от состава жидкого металла исследуемой системы. Расчет был проведен с использованием констант равновесия реакций, протекающих в расплаве при раскислении, а также параметров взаимодействия первого порядка (по Вагнеру) элементов в жидком железе. Активности компонентов оксидного расплава определяли с использованием теории субрегулярных ионных растворов. Активности газовой фазы рассчитывали с учетом парциальных давлений. Моделирование проводили для двух температур (1550 и 1600 °С) для фиксированных концентраций углерода (0 (отсутствие углерода в жидком железе) и 0,1 % (низкоуглеродистый металлический расплав)). Показано, что в сравнении с кремнием стронций является более сильным раскислителем в жидком металле. По результатам моделирования в качестве основных оксидных фаз в продуктах раскисления должны быть жидкие оксидные неметаллические включения переменного состава или ортои  метасиликаты стронция Sr2 SiO4 и SrSiO3  (при увеличении концентрации стронция). Снижение температуры жидкого металла приводит к  некоторым изменениям в фазообразовании (становится возможным образование силиката SrSiO3 ).</p></abstract><trans-abstract xml:lang="en"><p>At the moment, to improve quality of metal (especially low-alloyed), out-of-furnace steel processing technologies are used with complex alloys utilization, which include alkaline earth metals (ALM) in addition to silicon. Study of strontium additives effect on deoxidation and liquid steel modification processes is one of the promising areas of research in field of metallurgical technologies. Thermodynamic modeling of phase equilibria in Fe – Sr – Si –C– O system melt was carried out using method of constructing surface of components solubility in metal. Solubility surface determines stability limits of non-metallic phases formed during deoxidation, depending on composition of liquid metal of the studied system. The  calculation was carried out using equilibrium constants of reactions occurring in the melt during deoxidation, as well as the first order interaction parameters (according to Wagner) of elements in liquid iron. Activity of the oxide melt components was determined using theory of subregular ionic solutions. Activity of the gas phase was calculated taking into account partial pressures. Simulations were performed for two temperatures (1550 and 1600  °C) for fixed carbon concentrations (0 (no carbon in liquid iron) and 0.1 % (low-carbon metal melt)). It has been shown that, in comparison with silicon, strontium is stronger deoxidizing agent in liquid metal. According to the simulation results, liquid oxide non-metallic inclusions of variable composition or strontium ortho- and metasilicates Sr2SiO4 and SrSiO3 (with an increase in strontium concentration) should be the main oxide phases in deoxidation products. Decrease in the temperature of liquid metal leads to changes in phase formation (formation of SrSiO3 silicate becomes possible).</p></trans-abstract><kwd-group xml:lang="ru"><kwd>термодинамическое моделирование</kwd><kwd>система Fe–Sr–Si–C–O</kwd><kwd>фазовые равновесия</kwd><kwd>раскисление стали</kwd><kwd>стронций</kwd><kwd>кремний</kwd></kwd-group><kwd-group xml:lang="en"><kwd>thermodynamic modeling</kwd><kwd>Fe–Sr–Si–C–O system</kwd><kwd>phase equilibrium</kwd><kwd>steel deoxidation</kwd><kwd>strontium</kwd><kwd>silicon</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Работа выполнена при поддержке Правительства РФ (Постановление № 211 от 16.03.2013 г.), соглашение № 02.A03.21.0011</funding-statement><funding-statement xml:lang="en">The work was supported by the Government of the Russian Federation (Resolution No. 211 of March 16, 2013), agreement No. 02.A03.21.0011</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Скок Ю.Я. 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