Abstract
Development of new methods for production of continuous cast slab blanks shall not be based on low speed equilibrium crystallization processes in steel. Feeding melt into crystallizer side-wall layers through feed rising construction of submerged nozzle with eccentric outlet holes allows a significant increase in steel crystallization rate during slab casting. The main results of large section slabs casting using new technology providing improvement of their quality are given. When casting steel through an experimental nozzle, considerable decrease in width of columnar crystals zone and increase of disoriented crystals zone are observed, as well as decrease in index of centerline segregation. When casting with a new technology, heat transfer in crystallizer increases by 10 – 12 %. In impact test, a number of qualitative characteristics of metal have been identified that are not captured in other types of tests. The main regularities in metal structure formation in continuous finishing mill group of continuous wide strip mill (CWSM) and subsequent cooling were studied using physical modeling method. Wedge-shaped samples of industrial melted low-carbon steel, withdrawn from semi-finished rolled stock cooled on CWSM intermediate rolling table, were rolled in one and two passes on twohigh speed laboratory rolling mill with a bypass device. Geometric and kinematic resemblance of rolling process was observed. Rolled samples, after fixed exposures on air, were dropped by a special device onto the lateral edge for partial hardening in cooling solution. A set of relative reductions were received longwise the sample, a set of cooling rates – edgewise. Based on results of physical modeling, the main formation regularities of low-carbon steel structure during rolling and accelerated cooling of strips on continuous wide strip mill were established. Using these regularities and the Hall-Petch equation, it is possible to provide specified structure and flow limit of the finished hot-rolled plate. By eliminating of additional heating of slabs for rolling and improving quality of rolled products, a significant economic effect can be obtained.
Highlights
Recent developments of water and mist spray cooling in continuous casting of steels // Metallurgical Research Technology. 2016
Development of new methods for production of continuous cast slab blanks shall not be based on low speed equilibrium crystallization processes in steel
Feeding melt into crystallizer side-wall layers through feed rising construction of submerged nozzle with eccentric outlet holes allows a significant increase in steel crystallization rate during slab casting
Summary
Использование подачи расплава в пристеночные слои стенок кристаллизатора через напорную конструкцию погружного стакана с эксцентричными выходными отверстиями позволяет при разливке слябов добиться сущест венного увеличения скорости кристаллизации стали. При разливке стали через опытный стакан наблюдается значительное уменьшение ширины зоны столбчатых кристаллов и увеличение зоны разориентированных кристаллов, а также уменьшение балла осевой ликвации. По результатам физического моделирования установлены основные закономерности формирования структуры низкоуглеродистой стали при прокатке и ускоренном охлаждении полос на непрерывном широкополосном стане.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Izvestiya Visshikh Uchebnykh Zavedenii. Chernaya Metallurgiya = Izvestiya. Ferrous Metallurgy
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
