Effect of casting parameters on sticker breakout and its propagation behaviour during slab continuous casting

Liu, Y.; Wang, X. D.; Yao, Man; Zhang, X. B.; Ma, Huijuan; Wang, Z.; C., J.; Wang, X.; Shi, Guo-Quan

doi:10.1179/1743281214y.0000000189

Cited by 17 publications

(8 citation statements)

References 10 publications

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“…In addition, various studies have investigated the effect of the casting speed on a number of different slab defects such as hook structures, particle inclusions, and oscillation marks. Whereas problems like bulging and breakouts seem to intensify at higher casting speeds [19,20], Li et al [20] and Lee et al [21] reported a reduction in both the hook depth and the inclusion index/number of entrapped particles with growing casting speeds for speeds below 1.8 and 2.5 m/min, respectively. Their results are further backed up using an anti-correlation of the casting speed and the entrapment probability at the submerged entry nozzle revealed by Wu et al [22].…”

Section: Related Workmentioning

confidence: 98%

Effect of slab width on choice of appropriate casting speed in steel production

Merten

Hütt

Uygun

2022

J. Iron Steel Res. Int.

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In steel continuous casting (CC), the choice of the appropriate speed at which the slab is cast can be influenced by many different factors and phenomena. While the slab thickness seems to have the biggest impact, other features like the slab width have been consistently overlooked. In fact, the slab width practically limits the casting speed via the mass flow constraint which governs the input and output balance at the tundish. Here, we present a case study that aims at analyzing steel production data from the perspective of casting speed constraints. By studying the speed fluctuations of an industrial CC machine, we identify a strategic regime change toward a stricter consideration of the mass flow constraint. The regime change manifests itself in a significant increase in the correlation between the actual casting speed and the maximal speed associated with the mass flow constraint. On the surface, taking greater account of the input and output balance at the tundish has reduced the productivity of the continuous caster; however, one can argue that the lessened yield is compensated by a diminished risk of eventual slab breaking. From the perspective of this trade-off, we establish a visualization technique that enables us to pinpoint the boundary beyond which one strategic regime becomes economically more advantageous than the other.

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Section: Related Workmentioning

confidence: 98%

Effect of slab width on choice of appropriate casting speed in steel production

Merten

Hütt

Uygun

2022

J. Iron Steel Res. Int.

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“…In the view of the heat transfer between slab shell and mould copper plates, the higher and lower temperature were not helpful to obtain the steady heat transfer, which would like to bring the risk of sticker breakout. slab were calculated by the temperature of the adjacent thermocouples [14] as shown in Equations ( 1) to (3).…”

Section: Occurrence Timementioning

confidence: 99%

Casting parameters and propagation behaviour of sticker breakout for the conventional slab

Liu

Wang

et al. 2022

Ironmaking & Steelmaking

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The casting parameters and behaviour of 61 sticker breakouts were analysed during the continuous casting of the conventional slab. The difference of sticker breakouts between the conventional slabs and wide and heavy slabs was also studied. The results show that the high casting speed or change of casting speed is the main reason. The mould level of the conventional slab is small and not the reason for sticker breakouts, which is different from the causes of wide and heavy slab. In terms of propagation behaviour, there are 14 cases out of 61 sticker breakouts occurred only around one column of thermocouples. The vertical velocity is in the range of 0.3∼2.4 m•min −1 , and the horizontal velocity is in the range of 1.0∼9.0 m•min −1 . The vertical velocities of the three sticker breakouts are higher than their casting speeds, which is different from the wide and heavy slab.

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“…The formation of a sticker breakout starts with localised sticking followed by tearing of the shell and the tear propagating down the mould, 2,19 as shown in Fig. 2.…”

Section: Description Of Slab Continuous Casting Processmentioning

confidence: 99%

Development and application of mould breakout prediction system with online thermal map for steel continuous casting

Deng

et al. 2014

Ironmaking & Steelmaking

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A new system to predict and prevent sticking type breakout in slab continuous casting is presented. It uses novel logic judgment model for sticker prediction. The elaborate model has four important characteristics: (1) arranging more rows of thermocouples in high density; (2) using temperature change rate and the time lag of abnormal changes for neighbouring thermocouple temperatures; (3) abandoning frequently used temperature inversion; and (4) vertical detection and horizontal detection to accurately recognise sticker propagation. The results of example simulations and field application indicate that the present model can detect sticking type breakout completely and in time keep false alarm ratios to a minimum and so achieve better performance for breakout prediction and prevention. Also, the mould breakout prevention system (MBPS) uses online thermal map of the mould for process visualisation and assisting breakout prediction. A novel method called 'contour region filling method' is proposed for drawing the colour maps, which includes discrete data gridding, contour line generation and contour polygon filling. Simulation experiments demonstrate that the method is feasible and effective for drawing online thermal maps. Meanwhile, field application results indicate that the present thermal map could well reflect the characteristics of temperature field of mould in normal and abnormal conditions, and is satisfactory for the process of practical operation.

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Effect of casting parameters on sticker breakout and its propagation behaviour during slab continuous casting

Cited by 17 publications

References 10 publications

Effect of slab width on choice of appropriate casting speed in steel production

Effect of slab width on choice of appropriate casting speed in steel production

Casting parameters and propagation behaviour of sticker breakout for the conventional slab

Development and application of mould breakout prediction system with online thermal map for steel continuous casting

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