Effects of an even secondary cooling mode on the temperature and stress fields of round billet continuous casting steel

Zhang, Jian; Chen, Dengfu; Zhang, Chengqian; Wang, Shuigen; Hwang, Weng-Sing; Han, Miao

doi:10.1016/j.jmatprotec.2015.03.022

Cited by 27 publications

(17 citation statements)

References 12 publications

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“…The influence of fluid flow can be accounted in a simplified way by means of the effective thermal conductivity k eff . Increasing heat transfer due to convection in the flow of liquid steel at different distances from the meniscus can be considered by an increased effective thermal conductivity as proposed by Zhang et al [33]. For more information about the solidification model in terms of equations, initial and boundary conditions, see the previous works of the co-authors of this paper [3,31].…”

Section: Slice Solidification Modelmentioning

confidence: 99%

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

Březina

Mauder

Klimeš

et al. 2021

Metals

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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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Section: Slice Solidification Modelmentioning

confidence: 99%

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

Březina

Mauder

Klimeš

et al. 2021

Metals

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“…The influence of heat transfer by the fluid flow is account in the effective thermal conductivity term k eff . The thermal conductivity is increased by the flow of liquid steel at different distances from the meniscus, where k eff is represented by Zhang et al [12] as follows:…”

Section: Solidification Model-brdsmmentioning

confidence: 99%

High Quality Steel Casting by Using Advanced Mathematical Methods

Mauder

Stetina

2018

Metals

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The main concept of this paper is to utilize advanced numerical modelling techniques with self-regulation algorithm in order to reach optimal casting conditions for real-time casting control. Fully 3-D macro-solidification model for the continuous casting (CC) process and an original fuzzy logic regulator are combined. The fuzzy logic (FL) regulator reacts on signals from two data inputs, the temperature field and the historical steel quality database. FL adjust the cooling intensity as a function of casting speed and pouring temperature. This approach was originally designed for the special high-quality high-additive steel grades such as higher strength grades, steel for acidic environments, steel for the offshore technology and so forth. However, mentioned approach can be also used for any arbitrary low-carbon steel grades. The usability and results of this approach are demonstrated for steel grade S355, were the real historical data from quality database contains approximately 2000 heats. The presented original solution together with the large steel quality databases can be used as an independent CC prediction control system.

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“…Many scholars have studied the numerical simulation of the optimization of the secondary cooling system of continuous casting process. Zhang et al [20] presented an unequal interval arrangement of nozzles (UIAN) in the casting direction of the secondary cooling process for continuous casting of the round billets, which can uniform the surface temperature of the round billets and eliminate the midway cracks. Meanwhile, Hou et al [21] developed a dynamic secondary cooling control model which can automatically adjust the secondary cooling flow according to the slab casting parameters and maintain the slab surface temperature closer to the target value.…”

Section: Introductionmentioning

confidence: 99%

Thermomechanical Analysis of the Effects of Water Distribution on Cracks during Vertical Continuous Casting under Soft Reduction Conditions

Yao

Wang

Liu

et al. 2020

Advances in Materials Science and Engineering

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In the production process of continuous casting slab, the unreasonable secondary cooling system can lead to serious crack defects. This study focuses on the problem of cracks in nuclear power stainless steel produced by vertical continuous casting under soft reduction conditions. Based on the actual production process parameters, the thermomechanical finite element model was established to investigate the effects of water distribution in the secondary cooling zones on cracks by using ProCAST. The results show that the stress concentration is obvious under the original process, especially the positions of 4 mm below the wide surface and 6 mm below the narrow surface. It is easy to generate cracks, and the area with the highest hot-tearing index is approximately 26 cm2. In addition, the secondary cooling system is adjusted based on the existing problems of the original process. The temperature of the casting slab rises by about 15°C at the solidification end point, and the length of the liquid core increases by about 0.5 m when the quantity of the water flow decreases in zone 2 and zone 3. The stress concentration is alleviated, and the possibility of cracking is reduced. Especially, it is evident that the proportion of water on the loose side margin increases from 40% to 45%, while the proportion of water on the fixed side margin of zone 3 is adjusted from 56% to 60%.

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Effects of an even secondary cooling mode on the temperature and stress fields of round billet continuous casting steel

Cited by 27 publications

References 12 publications

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

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

High Quality Steel Casting by Using Advanced Mathematical Methods

Thermomechanical Analysis of the Effects of Water Distribution on Cracks during Vertical Continuous Casting under Soft Reduction Conditions

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