Strategy of Cooling Parameters Selection in the Continuous Casting of Steel

This paper presents a strategy of the cooling parameters selection in the process of continuous steel casting. Industrial tests were performed at a slab casting machine at the Arcelor Mittal Poland Unit in Krakow. The tests covered 55 heats for 7 various steel grades. Based on the existing casting technology a numerical model of the continuous steel casting process was formulated. The numerical calculations were performed for three casting speeds - 0.6, 0.8 and 1 m min-1. An algorithm was presented that allows us to compute the values of the heat transfer coefficients for the secondary cooling zone. The correctness of the cooling parameter strategy was evaluated by inspecting the shell thickness, the length of the liquid core and the strand surface temperature. The ProCAST software package was used to construct the numerical model of continuous casting of steel.

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Applying a Numerical Model of the Continuous Steel Casting Process to Control the Length of the Liquid Core in the Strand

Archives of Metallurgy and Materials ◽

10.1515/amm-2015-0040 ◽

2015 ◽

Vol 60 (1) ◽

pp. 251-256 ◽

Cited By ~ 1

Author(s):

K. Miłkowska-Piszczek ◽

J. Falkus

Keyword(s):

Numerical Model ◽

Continuous Casting ◽

Steel Casting ◽

Continuous Casting Machine ◽

Liquid Core ◽

Casting Process ◽

Continuous Steel Casting ◽

Continuous Steel ◽

Cooling Zone ◽

Secondary Cooling

Abstract This paper presents development and the application of a numerical model of the continuous steel casting process to optimise the strand solidification area. The design of the numerical model of the steel continuous casting process was presented and which was developed based on the actual dimensions of the slab continuous casting machine in ArcelorMittal Poland Unit in Kraków. The S235 steel grade and the cast strand format of 220×1280 mm were selected for the tests. Three strand casting speeds were analysed: 0.6, 0.8 and 1 m min-1. An algorithm was presented, allowing the calculation of the heat transfer coefficient values for the secondary cooling zone. In order to verify the results of numerical simulations, additional temperature measurements of the strand surface within the secondary cooling chamber were made. The ProCAST software was used to construct the numerical model of continuous casting of steel.

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Comparison of Optimization-Regulation Algorithms for Secondary Cooling in Continuous Steel Casting

Metals ◽

10.3390/met11020237 ◽

2021 ◽

Vol 11 (2) ◽

pp. 237

Author(s):

Michal Brezina ◽

Tomas Mauder ◽

Lubomir Klimes ◽

Josef Stetina

Keyword(s):

Convergence Rate ◽

Water Flow ◽

Steel Casting ◽

Casting Process ◽

Continuous Steel Casting ◽

Continuous Steel ◽

Cooling Zone ◽

Secondary Cooling ◽

Flow Rates ◽

Secondary Cooling Zone

The paper presents the comparison of optimization-regulation algorithms applied to the secondary cooling zone in continuous steel casting where the semi-product withdraws most of its thermal energy. In steel production, requirements towards obtaining defect-free semi-products are increasing day-by-day and the products, which would satisfy requirements of the consumers a few decades ago, are now far below the minimum required quality. To fulfill the quality demands towards minimum occurrence of defects in secondary cooling as possible, some regulation in the casting process is needed. The main concept of this paper is to analyze and compare the most known metaheuristic optimization approaches applied to the continuous steel casting process. Heat transfer and solidification phenomena are solved by using a fast 2.5D slice numerical model. The objective function is set to minimize the surface temperature differences in secondary cooling zones between calculated and targeted surface temperatures by suitable water flow rates through cooling nozzles. Obtained optimization results are discussed and the most suitable algorithm for this type of optimization problem is identified. Temperature deviations and cooling water flow rates in the secondary cooling zone, together with convergence rate and operation times needed to reach the stop criterium for each optimization approach, are analyzed and compared to target casting conditions based on a required temperature distribution of the strand. The paper also contains a brief description of applied heuristic algorithms. Some of the algorithms exhibited faster convergence rate than others, but the optimal solution was reached in every optimization run by only one algorithm.

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Calculation of Solidification during Continuous Casting and its Experimental Verification

Materials Science Forum ◽

10.4028/www.scientific.net/msf.473-474.329 ◽

2005 ◽

Vol 473-474 ◽

pp. 329-334 ◽

Cited By ~ 1

Author(s):

Gábor Fehérvári

Keyword(s):

Continuous Casting ◽

Experimental Verification ◽

Steel Casting ◽

Shell Thickness ◽

Computer Programs ◽

Continuous Steel Casting ◽

Experimental Results ◽

Continuous Steel ◽

Industrial Experiments

Two computer programs were used for simulation of continuous steel casting processes in frame of this work. In the same time industrial experiments by isotope technics were carried out for observation of solidification and shell thickness. The comparison of calculations and experimental results mutually verified the applicability of methods for more sophisticated control of continuous casting procedure.

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Determination of the Cracking Susceptibility of Steel S355J2G3 during the Continuous Casting Process

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.220-221.731 ◽

2015 ◽

Vol 220-221 ◽

pp. 731-736

Author(s):

Konrad Błażej Laber ◽

Henryk Dyja

Keyword(s):

Continuous Casting ◽

Steel Casting ◽

Physical Modelling ◽

Casting Process ◽

Steel Grade ◽

Continuous Steel Casting ◽

Continuous Steel ◽

Continuous Casting Process ◽

Process Simulator

The paper presents the results of physical modelling aimed at determining the cracking susceptibility of the selected steel grade under conditions characteristic of the continuous casting process. The material used for investigation was steel grade S355J2G3 [1]. For a study on the physical modelling of the continuous steel casting process, the GLEEBLE 3800 [2, 3], a metallurgical process simulator, was employed. The obtained results allowed establishing conditions for a continuous steel casting process that could cause cracks to form in the material being cast. Research on one of technological conditions for steelworks was carried out taking into account the problem of cracking during rolling in the initial group of the bar rolling mill.

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MATHEMATICAL MODELING OF THE PROCESSES OF THE FORMATION OF CAST UNITS IN THE CONTINUOUS CASTING OF STEEL

Вестник ГГНТУ. Технические науки ◽

10.34708/gstou.2019.16.2.007 ◽

2019 ◽

Author(s):

А.С. Нурадинов ◽

Н.С. Уздиева ◽

Э.М. Балатханова ◽

А.Н. Тепсаев

Keyword(s):

Mathematical Modeling ◽

Continuous Casting ◽

Continuous Casting Machine ◽

Variable Parameter ◽

Casting Machine ◽

Cooling Zone ◽

Continuous Casting Of Steel ◽

Secondary Cooling ◽

Secondary Cooling Zone ◽

Proposed Model

Проведен теоретический анализ процессов формирования литых заготовок при непрерывной разливке стали. На базе проведенного анализа разработана математическая модель для изучения термосиловых процессов, происходящих в кристаллизаторе и зоне вторичного охлаждения машины непрерывного литья заготовок (МНЛЗ). Методом математического моделирования определены параметры теплообмена и затвердевания исследуемых заготовок вдоль ее технологической оси. В качестве переменного параметра при формировании заготовок рассмотрена интенсивность теплоотвода в зоне вторичного охлаждения. Установлено, что математическое моделирование достаточно адекватно воспроизводит процессы формирования реальной непрерывнолитой заготовки, что позволяет рекомендовать предложенную модель для проведения исследований и оптимизации условий теплообмена в зоне вторичного охлаждения МНЛЗ. A theoretical analysis of the formation of castings in the continuous casting of steel. Based on the analysis, a mathematical model has been developed for the study of thermoforce processes occurring in the mold and the secondary cooling zone of a continuous casting machine (CCM). The parameters of heat transfer and solidification of the studied blanks along its technological axis are determined by the method of mathematical modeling. The intensity of the heat sink in the secondary cooling zone is considered as a variable parameter in the formation of blanks. It is established that mathematical modeling adequately reproduces the processes of formation of a real continuouscast billet, which allows us to recommend the proposed model for research and optimization of heat exchange conditions in the zone of secondary cooling of continuous casting machines.

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