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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">10.17073/0368-0797-2024-2-219-228</article-id><article-id custom-type="elpub" pub-id-type="custom">blackmet-2713</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>По материалам международной  конференции «Научно-практическая школа для молодых металлургов» – 2023</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>On the materials of the international conference “Scientific and Practical School for Young Metallurgists” – 2023</subject></subj-group></article-categories><title-group><article-title>Повышение коррозионных свойств дуплексной стали с помощью модифицирования РЗМ</article-title><trans-title-group xml:lang="en"><trans-title>Increasing the corrosion properties of duplex steel with REM modification</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0009-0006-9622-7243</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Карасев</surname><given-names>В. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Karasev</surname><given-names>V. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Владимир Сергеевич Карасев, инженер научно-образовательного центра «Северсталь-Политех»</p><p>Россия, 195251, Санкт-Петербург, ул. Политехническая, 29</p></bio><bio xml:lang="en"><p>Vladimir S. Karasev, Engineer of the Scientific and Educational Center “Severstal-Polytech”</p><p>29 Politekhnicheskaya Str., St. Petersburg 195251, Russian Federation</p></bio><email xlink:type="simple">karasev_vs@spbstu.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Коджаспиров</surname><given-names>Г. Е.</given-names></name><name name-style="western" xml:lang="en"><surname>Kodzhaspirov</surname><given-names>G. E.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Георгий Ефимович Коджаспиров, д.т.н., профессор Высшей школы физики и технологий материалов</p><p>Россия, 195251, Санкт-Петербург, ул. Политехническая, 29</p></bio><bio xml:lang="en"><p>Georgii E. Kodzhaspirov, Dr. Sci. (Eng.), Prof. of the Higher School of Physics and Technology of Materials</p><p>29 Politekhnicheskaya Str., St. Petersburg 195251, Russian Federation</p></bio><email xlink:type="simple">kodjaspirov@spbstu.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/0000-0003-2571-060X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Федоров</surname><given-names>А. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Fedorov</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Александр Сергеевич Федоров, инженер Научно-технологического комплекса Новые технологии и материалы</p><p>Россия, 195251, Санкт-Петербург, ул. Политехническая, 29</p></bio><bio xml:lang="en"><p>Aleksandr S. Fedorov, Engineer of the Scientific and Technological Complex “New Technologies and Materials”</p><p>29 Politekhnicheskaya Str., St. Petersburg 195251, Russian Federation</p></bio><email xlink:type="simple">fedorov_as@spbstu.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/0000-0001-6701-1765</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Альхименко</surname><given-names>А. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Al’khimenko</surname><given-names>A. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Алексей Александрович Альхименко, директор Научно-технологического комплекса «Новые технологии и материалы»</p><p>Россия, 195251, Санкт-Петербург, ул. Политехническая, 29</p></bio><bio xml:lang="en"><p>Aleksei A. Al’khimenko, Director of the Scientific and Technological Complex “New Technologies and Materials”</p><p>29 Politekhnicheskaya Str., St. Petersburg 195251, Russian Federation</p></bio><email xlink:type="simple">a.alkhimenko@spbstu.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/0000-0002-4817-4048</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Житенев</surname><given-names>А. И.</given-names></name><name name-style="western" xml:lang="en"><surname>Zhitenev</surname><given-names>A. I.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Андрей Игоревич Житенев, к.т.н., руководитель технологичес­ких проектов, Дирекция по исследованиям и разработке новых продуктов, управление «Электротехнические стали»</p><p>Россия, 398040, Липецк, пл. Металлургов, 2</p></bio><bio xml:lang="en"><p>Andrei I. Zhitenev, Cand. Sci. (Eng.), Head of Technological Projects, Directorate for Research and Development of New Products, Department of “Electrotechnical Steels”</p><p>2 Metallurgov Sqr., Lipetsk 398040, Russian Federation</p></bio><email xlink:type="simple">zhitenev.ai1991@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский политехнический университет Петра Великого</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Peter the Great St. Petersburg Polytechnic University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>ПАО «Новолипецкий металлургический комбинат»</institution><country>Россия</country></aff><aff xml:lang="en"><institution>PJSC “Novolipetsk Metallurgical Plant”</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>21</day><month>04</month><year>2024</year></pub-date><volume>67</volume><issue>2</issue><fpage>219</fpage><lpage>228</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Карасев В.С., Коджаспиров Г.Е., Федоров А.С., Альхименко А.А., Житенев А.И., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Карасев В.С., Коджаспиров Г.Е., Федоров А.С., Альхименко А.А., Житенев А.И.</copyright-holder><copyright-holder xml:lang="en">Karasev V.S., Kodzhaspirov G.E., Fedorov A.S., Al’khimenko A.A., Zhitenev A.I.</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/2713">https://fermet.misis.ru/jour/article/view/2713</self-uri><abstract><p>Дуплексные коррозионностойкие стали – это современный класс материалов, обладающих уникальным сочетанием высоких коррозионных и механических свойств. Благодаря этому они могут получить широкое применение в деталях машин и агрегатов на месторождениях с агрессивными условиями добычи нефти и газа. Одним из недостатков этих материалов является их склонность к локальным коррозионным поражениям, при прочих равных условиях формирующихся на неметаллических включениях (НВ), которые образуются при выплавке и разливке. Для управления чистотой стали в условиях открытой индукционной выплавки эффективно применять модифицирование редкоземельными металлами (РЗМ). Поэтому целью настоящей работы являлось определение оптимального содержания РЗМ в дуплексной стали для повышения коррозионных свойств. Проведено термодинамическое моделирование образования НВ в дуплексной коррозионностойкой стали S32750. Результаты расчетов сопоставлены с экспериментальными данными. Показано, что существует оптимальная концентрация РЗМ, при которой загрязненность включениями минимальна из-за благоприятных условий для их удаления, а при дальнейшем увеличении расхода повышается из-за коагуляции большого количества тугоплавких оксидов. В результате электрохимичес­ких испытаний определены такие параметры, как потенциал коррозии, потенциал питтингообразования и базис питтингостойкостости опытных сталей. Коррозионные свойства исследованной дуплексной стали значительно улучшаются при обработке РЗМ. На качественном уровне проведена оценка электрохимических потенциалов разных типов включений. На основании полученных результатов по коррозионной стойкости и загрязненности изученных отливок получено оптимальное количество РЗМ, вводимого для модифицирования включений, которое составляет 0,05 % (0,65Ce + 0,35La).</p></abstract><trans-abstract xml:lang="en"><p>Duplex stainless steels are a modern class of materials with a unique combination of high corrosion and mechanical properties. Due to this, they can be widely used in machine parts and aggregates in fields with aggressive oil and gas production conditions. One of the disadvantages of these materials is their tendency to local corrosion damage on non-metallic inclusions, other things being equal, formed during smelting and casting. To control the purity of steel in conditions of open induction smelting, it is effective to use modification with rare earth metals (REM). Therefore, the purpose of this work was to determine the optimal content of REM in duplex steel to increase corrosion properties. Thermodynamic modeling of the formation of nonmetallic inclusions in duplex corrosion-resistant steel S32750 was carried out and the results of calculations were compared with the experimental data. It is shown that there is an optimal concentration of REM at which contamination with inclusions is minimal due to favorable conditions for their removal, and with a further increase in consumption it increases due to coagulation of a large number of refractory oxides. Electrochemical tests were performed and parameters such as corrosion potential, pitting formation potential and the basis of pitting resistance of experimental steels were determined. Therefore, the corrosion properties of the investigated duplex steel are significantly improved when treated with REM. The electro­chemical potentials of different types of inclusions are evaluated on a qualitative level. Based on the obtained results on corrosion resistance and contamination of the studied castings, the optimal amount of REM introduced for modifying inclusions is 0.05 % (0.65Ce + 0.35La).</p></trans-abstract><kwd-group xml:lang="ru"><kwd>дуплексные коррозионностойкие стали</kwd><kwd>термодинамическое моделирование</kwd><kwd>технология раскисления</kwd><kwd>модифицирование</kwd><kwd>неметаллические включения</kwd><kwd>электрохимические исследования</kwd></kwd-group><kwd-group xml:lang="en"><kwd>duplex stainless steels</kwd><kwd>thermodynamic modelling</kwd><kwd>deoxidation technology</kwd><kwd>modification</kwd><kwd>non-metallic inclusions</kwd><kwd>electrochemical tests</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Исследование выполнено при финансовой поддержке Министерства науки и высшего образования Российской Федерации в рамках программы Научного центра мирового уровня: Передовые цифровые технологии (соглашение № 075-15-2022-311 от 20.04.2022).</funding-statement><funding-statement xml:lang="en">The work was supported by the Ministry of Science and Higher Education of the Russian Federation under the World Class Research Centre Program: Advanced Digital Technologies (Agreement No. 075-15-2022-311 dated 20.04.2022).</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">Franci R., Byrne G. 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