scholarly journals Monitoring Surface Defects Deformations and Displacements in Hot Steel Using Magnetic Induction Tomography

Sensors ◽  
2019 ◽  
Vol 19 (13) ◽  
pp. 3005 ◽  
Author(s):  
Fang Li ◽  
Stefano Spagnul ◽  
Victor Odedo ◽  
Manuchehr Soleimani
Keyword(s):  
Continuous Casting ◽  
Magnetic Induction ◽  
Surface Defects ◽  
Surface Deformation ◽  
Real Life ◽  
Steel Production ◽  
Casting Process ◽  
Contactless Method ◽  
Image Region ◽  
Magnetic Induction Tomography

Magnetic Induction Tomography (MIT) is a non-invasive imaging technique that has been widely applied for imaging materials with high electrical conductivity contrasts. Steel production is among an increasing number of applications that require a contactless method for monitoring the casting process due to the high temperature of hot steel. In this paper, an MIT technique is proposed for detecting defects and deformations in the external surfaces of metal, which has the potential to be used to monitor the external surface of hot steel during the continuous casting process. The Total Variation (TV) reconstruction algorithm was developed to image the conductivity distributions. Nonetheless, the reconstructed image of the deformed square metal obtained using the TV algorithm directly does not yield resonable images of the surface deformation. However, differential images obtained by subtracting the image of a perfect square metal with no deformations from the image obtained for a deformed square metal does provide accurate and repeatable deformation information. It is possible to obtain a more precise image of surface deformation by thresholding the differential image. This TV-based threshold-differencing method has been analysed and verified from both simulation and experimental tests. The simulation results reported that 0.92 % of the image region can be detected, and the experimental results indicated a 0.57 % detectability. Use of the proposed method was demonstareted in a MIT device which was used in continuous casting set up. The paper shows results from computer simulation, lab based cold tests, and real life data from continoeus cating demonstating the effectiveness of the proposed method.

The Effect of Temperature Fluctuation on the Formation of Billet Surface Defect in the Initial Solidification Area

2010 ◽  
Vol 148-149 ◽  
pp. 163-167
Author(s):  
Xiao Li Jin ◽  
Zuo Sheng Lei ◽  
Kang Deng ◽  
Zhong Ming Ren
Keyword(s):  
Continuous Casting ◽  
Temperature Fluctuation ◽  
Surface Defects ◽  
Casting Process ◽  
Effect Of Temperature ◽  
Billet Surface ◽  
Maximum Value ◽  
Key Factor ◽  
Oscillation Marks ◽  
Initial Solidification

The heat transfer in steel continuous casting process under mold oscillation was calculated, and temperature fluctuation phenomena was found in the initial solidification area, the maximum value was approximate 16 °C. The effect of different continuous casting parameters on temperature fluctuation were analyzed, and the temperature fluctuation was considered to be a key factor to the formation of oscillation marks. The Index of Temperature Fluctuation(ITF) was proposed to predict the effect of temperature fluctuation on the formation of billet surface defects.

scholarly journals An improved imperialist competitive algorithm for hybrid flowshop rescheduling in steelmaking-refining-continuous casting process

2020 ◽  
pp. 002029402096018
Author(s):  
Kunkun Peng ◽  
Xudong Deng ◽  
Chunjiang Zhang ◽  
Quan-Ke Pan ◽  
Liang Ren ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Optimal Schedule ◽  
Steel Production ◽  
Casting Process ◽  
Imperialist Competitive Algorithm ◽  
Initial Population ◽  
Hybrid Flowshop ◽  
Iron And Steel ◽  
Competitive Algorithm ◽  
Iron And Steel Production

Steelmaking-refining-Continuous Casting (SCC) is a key process in iron and steel production. SCC scheduling is to determine an optimal schedule for the SCC process, which is a worldwide and important problem. High-quality SCC scheduling methods will help to allocate production resources effectively and increase the productivity. However, dynamic events (e.g. machine breakdown) may happen in the realistic SCC process, which will make the SCC schedule inexecutable or not optimal. In this case, SCC rescheduling is essential in order to obtain a new optimal schedule suitable for the current production environments. The SCC rescheduling can be modeled as hybrid flowshop rescheduling. In this paper, an Improved Imperialist Competitive Algorithm (IICA) is proposed to address the SCC rescheduling. In the proposed IICA, an empire initialization is first devised for constructing an initial population with diversity and certain quality. Moreover, multiswap-based local search and imperialist competition are designed to improve the exploitation ability of the IICA, while revolution and restart strategy are devised to enhance the exploration ability of the IICA. Comparison experiments with three kinds of ICA have shown the efficiency of the IICA.

scholarly journals On Modelling Parasitic Solidification Due to Heat Loss at Submerged Entry Nozzle Region of Continuous Casting Mold

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1375
Author(s):  
Alexander Vakhrushev ◽  
Abdellah Kharicha ◽  
Menghuai Wu ◽  
Andreas Ludwig ◽  
Yong Tang ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Steel Slag ◽  
Phase Interface ◽  
Steel Production ◽  
Submerged Entry Nozzle ◽  
Casting Process ◽  
Material Model ◽  
Slag Layer ◽  
Continuous Casting Mold ◽  
High Production Rate

Continuous casting (CC) is one of the most important processes of steel production; it features a high production rate and close to the net shape. The quality improvement of final CC products is an important goal of scientific research. One of the defining issues of this goal is the stability of the casting process. The clogging of submerged entry nozzles (SENs) typically results in asymmetric mold flow, uneven solidification, meniscus fluctuations, and possible slag entrapment. Analyses of retained SENs have evidenced the solidification of entrapped melt inside clog material. The experimental study of these phenomena has significant difficulties that make numerical simulation a perfect investigation tool. In the present study, verified 2D simulations were performed with an advanced multi-material model based on a newly presented single mesh approach for the liquid and solid regions. Implemented as an in-house code using the OpenFOAM finite volume method libraries, it aggregated the liquid melt flow, solidification of the steel, and heat transfer through the refractory SENs, copper mold plates, and the slag layer, including its convection. The introduced novel technique dynamically couples the momentum at the steel/slag interface without complex multi-phase interface tracking. The following scenarios were studied: (i) SEN with proper fiber insulation, (ii) partial damage of SEN insulation, and (iii) complete damage of SEN insulation. A uniform 12 mm clog layer with 45% entrapped liquid steel was additionally considered. The simulations showed that parasitic solidification occurred inside an SEN bore with partially or completely absent insulation. SEN clogging was found to promote the solidification of the entrapped melt; without SEN insulation, it could overgrow the clogged region. The jet flow was shown to be accelerated due to the combined effect of the clogging and parasitic solidification; simultaneously, the superheat transport was impaired inside the mold cavity.

Modeling of the Steel Flow and Non-Metallic Inclusion Separation due to Flotation in a Six-Strand cc Tundish

2012 ◽  
Vol 706-709 ◽  
pp. 1556-1561
Author(s):  
Marek Warzecha
Keyword(s):  
Continuous Casting ◽  
Technological Development ◽  
Three Dimensional ◽  
Steel Production ◽  
Casting Process ◽  
Metallic Inclusion ◽  
Continuous Casting Process ◽  
Flow Through ◽  
Steel Flow ◽  
Physical Phenomena

Constantly increasing customers’ demands for the production of high and very high-quality steels, promote the intensive technological development of their production. Today, the dominating method of global steel production is continuous casting. A continuous casting plant includes the ladle turret, several steel ladles, a tundish, and a mold followed by a framework of rolls to support the strip. The tundish has become a very important metallurgical unit in the continuous casting process. Nowadays its role is not only to guaranty the link between the process of secondary metallurgy and the continuous casting process in the mould but it becomes an active metallurgical reactor. Therefore in recent years a lot of researches were done to establish a better understanding of the physical phenomena accompanying the steel flow through the tundish and non-metallic inclusion separation into the top slag cover. The article presents computational studies of the three-dimensional turbulent steel flow and non-metallic inclusions separation in a multi-strand tundish for steady-state casting conditions. Simulations of the steel flow in the tundish are performed with boundary conditions that are derived from the real casting process. The mathematical model used for simulations, was partly validated with experimental measurements. Numerical calculations are carried out by the finite-volume code Fluent using k-ε standard turbulence model. With the calculated flow field, micro-inclusions removal due to flotation to the coving slag is investigated numerically. For the particle separation at the interface a modified boundary condition is implemented.

scholarly journals In situ steel solidification imaging in continuous casting using magnetic induction tomography

2020 ◽  
Vol 31 (6) ◽  
pp. 065401 ◽  
Author(s):  
Manuchehr Soleimani ◽  
Fang Li ◽  
Stefano Spagnul ◽  
Juan Palacios ◽  
José I Barbero ◽  
...  
Keyword(s):  
Continuous Casting ◽  
Magnetic Induction ◽  
Magnetic Induction Tomography

Analysis of Water Consumption Intensity for Steel Production in China

2020 ◽  
Vol 993 ◽  
pp. 1465-1472
Author(s):  
An Long Li ◽  
Zhi Hong Wang ◽  
Bo Xue Sun ◽  
Si Wen Gao
Keyword(s):  
Continuous Casting ◽  
Water Consumption ◽  
Steel Production ◽  
Casting Process ◽  
Balance Model ◽  
Total Water ◽  
Steel Rolling ◽  
Total Water Consumption ◽  
Accounting Model ◽  
Consumption Intensity

The water consumption intensity of steel production through BF-BOF technology was decomposed by an innovative process-based water-accounting model, i.e., water-balance model. One ton of steel product was chosen to be the functional unit. The system boundary of the case study included the production processes of coking, sintering, iron making, steel making, continuous casting and rolling. The results showed that the water consumption intensity of steel production was 3.969t/t in this case. The water consumption of evaporation, solidification and wastewater were 2.373t, 0.013t and 1.583t, accounting for 59.79%, 0.33% and 39.88% of the total water consumption, respectively. Steel rolling is the largest contributor to water consumption, and the amount of water consumption is 1.523t, accounting for 38.37% of the total water consumption; followed by coking process and continuous casting process, the amounts of which are 0.814t (20.50%) and 0.634t (15.97%), respectively. This finding can push the utilization of advanced technologies to save water resource in steel industry.

Effect of Water Gap in Delivery System on Twin Roll Strip Caster by Simulation

2014 ◽  
Vol 602-603 ◽  
pp. 652-655
Author(s):  
Luo Cheng Yang ◽  
Hong Xi Zhu ◽  
Cheng Ji Deng ◽  
Wen Jie Yuan ◽  
Jun Ding
Keyword(s):  
Continuous Casting ◽  
Delivery System ◽  
Surface Defects ◽  
Continuous Caster ◽  
Casting Process ◽  
Finite Element Software ◽  
Actual Production ◽  
Quality Material ◽  
Comsol Simulation ◽  
Twin Roll

In continuous casting process, the mould is the core of the continuous caster, and the vast majority of the surface defects of steel is originated in the crystallizer. Choosing a reasonable water gap in the delivery system is particularly important, especially in twin roll strip continuous casting, the flow delivery system thin belt has a close relationship with the quality of the products. Experiments to skateboard and water gap, STEEL AISI 4340 materials chosen as the simulation material at the same time, distribution water gap taking the form of a set themselves by using the finite element software COMSOL simulation calculation of different gaps opening mode of velocity field, and fluid line back to the high wall, made a comprehensive analysis in different speak way open comprehensive effect is best, the most conducive to the production of high quality material. The experiment determines the best form of water gap, improving the efficiency of the actual production. Make it to the actual production has a certain guiding significance.

Continuous Casting of Microalloyed Steels. Influence of Composition and Operational Parameters in Billet Surface Cracking

2005 ◽  
Vol 500-501 ◽  
pp. 163-170 ◽  
Author(s):  
G. Alvarez de Toledo ◽  
A. Arteaga ◽  
J.J. Laraudogoitia
Keyword(s):  
Continuous Casting ◽  
Surface Defects ◽  
Casting Process ◽  
Precipitate Size ◽  
Microalloyed Steels ◽  
Cast Billet ◽  
Main Concern ◽  
Operational Parameters ◽  
Solidification Model ◽  
Billet Surface

Surface defects, mainly intergranular cracks (IGC), in as cast billet is the main concern for the production of microalloyed steels with the continuous casting process. A description is given of the IGC in the as cast billet surface and the main casting parameters influencing its formation. An analytical model of the influence of the microalloyed content in the formation of precipitates and the corresponding billet surface ductility at the temperature of billet straightening is presented. The model was validated with bibliographical ductility experimental values and was used to perform composition optimisation for continuous casting production. The analytical approach has been completed with a numerical precipitation model coupled with a continuous casting billet solidification model. The coupled program allows precipitate size distribution calculation in selected points of the cross billet section as a function of production parameters, steel composition and billet size. These precipitate distributions are important to detect ductility problems in billets and to optimise the operational parameters so as to avoid these problems.

Study and Design on Clean Steel Production Platform

2012 ◽  
Vol 161 ◽  
pp. 37-41
Author(s):  
Fu Ming Zhang
Keyword(s):  
Continuous Casting ◽  
High Efficiency ◽  
Low Cost ◽  
Steel Production ◽  
Casting Process ◽  
Steel Plant ◽  
Continuous Casting Process ◽  
High Quality ◽  
Iron And Steel ◽  
Clean Steel

The technology for clean steel production in modern steel plant is analyzed, a philosophy with production efficiency, manufacturing cost and product performance in its core. A review on functions is also made which of high-efficiency, low-cost and high-quality steel products manufactured by the new generation iron and steel plant, in combination with the study on design of steelmaking – continuous casting process of Shougang Jingtang iron and steel plant. By applying precise and dynamic design system to optimize and allocate systems and working procedures of hot metal pretreatment, converter smelting, secondary refining, continuous casting process, etc, a platform of high-efficiency, low-cost and high-quality clean steel production is built.

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