Mechanism of Formation and Method of Detection of Breakout Caused by Sticking between Mould and Slab in Continuous Casting of Steel

Itoyama, Seiji; Habu, Yasuhiro; Sorimachi, Kenichi; Kawaharada, Akira; Yabe, Sunao

doi:10.2355/tetsutohagane1955.68.7_784

Cited by 7 publications

(5 citation statements)

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“…Yoichi ITO, 1) * Seiji NABESHIMA, 2) Yuji MIKI, 1) Jun KUBOTA 3) and Katsuaki MATSUOKA 4) 1) Steel Research Laboratory, JFE Steel Corporation, 1 Kokan-cho, Fukuyama, Hiroshima, 721-8510 Japan.…”

Section: Evaluation Of Solidified Shell Thickness By Thermocouple In mentioning

confidence: 99%

“…This method has been proposed and is now commonly adopted in the continuous casting process. [4][5][6] However high-speed casting increases the risk of re-melting type BO, which is caused by re-melting of the solidified shell by the sensible heat of the impinging molten steel flow from the SEN, and entrapment type BO, which is caused by disturbance of shell growth due to entrapment of foreign matter such as slag rim, mold powder and inclusions in the solidified shell. Most detection technologies for these types of BO are based on trial-and-error methods using the mold thermocouple and thus cannot be said to be widely established.…”

Section: Evaluation Of Solidified Shell Thickness By Thermocouple In mentioning

confidence: 99%

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Evaluation of Solidified Shell Thickness by Thermocouple in Mold

Ito¹,

Nabeshima²,

Miki³

et al. 2019

ISIJ Int.

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Section: Evaluation Of Solidified Shell Thickness By Thermocouple In mentioning

confidence: 99%

Section: Evaluation Of Solidified Shell Thickness By Thermocouple In mentioning

confidence: 99%

Evaluation of Solidified Shell Thickness by Thermocouple in Mold

Ito¹,

Nabeshima²,

Miki³

et al. 2019

ISIJ Int.

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“…Toshiyuki KAJITANI, 1) Yuichiro KATO, 2) Koji HARADA, 3) Koji SAITO, 4) Kazuumi HARASHIMA 1) and Wataru YAMADA 1) 1) Kimitsu R&D Laboratory, Nippon Steel Corporation, 1 Kimitsu, Kimitsu, Chiba 299-1141 Japan. (Received on April 10, 2008; accepted on June 10, 2008 ) Mechanism of a hydrogen-induced sticker breakout is studied paying attention to the observation that the frequency of the breakout is higher during continuous casting of Si-K steel than Al-K steel.…”

Section: Mechanism Of a Hydrogen-induced Sticker Breakout In Continuomentioning

confidence: 99%

“…A sticker breakout, [1][2][3] the most common type of breakout, initiates from the sticking of the solidifying shell to the mould wall. Then, the thin solid shell around the mould meniscus is ruptured due to continuing withdrawal of the strand, and the rupture of the shell is compensated by filling of the molten steel.…”

Section: Introductionmentioning

confidence: 99%

Mechanism of a Hydrogen-induced Sticker Breakout in Continuous Casting of Steel: Influence of Hydroxyl Ions in Mould Flux on Heat Transfer and Lubrication in the Continuous Casting Mould

et al. 2008

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The formation of the micropores in mould flux is further investigated employing solid-state 1 H NMR with CRAMPS technique that has successfully enabled the quantitative analysis of hydroxyl ions in mould flux. The spectra have revealed that hydroxyl ions exist in mould flux and they increase in molten flux pool especially during the casting of Si-K steel. The result provides the new mechanism for the formation of the micropores: in a continuous casting mould, water vapour in the atmospheric air is absorbed into molten flux pool as hydroxyl ions, and they are usually reduced by soluble Al in molten steel pool. However, during the casting of Si-K steel where Si is a weaker deoxidizing element, the hydroxyl ions are not easily reduced, and they form the micropores of the gas including H 2 O during the crystallization of mould flux in the flux channel. According to the proposed mechanism, mould flux with a lower activity of SiO 2 has been developed for Si-K steel, and it successfully prevents the sticker breakouts.

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“…1,2 In the past 10 years, a series of methods to predict breakout have been developed based on logical judgment and artificial intelligence, [3][4][5] wherein the mould copper temperature is commonly used in the breakout prediction system (BOPS) and the mould monitoring system. [6][7][8][9] However, sticker breakouts are still a common occurrence in practice, especially at high casting speed. 10 False alarms from BOPS are considered to be another serious problem in continuous casting production.…”

Section: Introductionmentioning

confidence: 99%

Visual detection based on computer vision for sticker breakout in slab continuous casting

Liu

Wang

et al. 2014

Ironmaking & Steelmaking

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Based on the temperature readings of the mould measured by thermocouples during slab continuous casting, mould temperature and its velocity thermographs were built up, and a visual detection method for the sticker breakout proposed. In the temperature velocity thermograph, the abnormal temperature regions are marked by virtue of the computer image-processing algorithm, such as frame difference, threshold segmentation and eight connected component labelling. The abnormal region features are then extracted and processed as the temperature velocities, geometry characteristics and propagation velocities. In order to distinguish the true and false sticker breakouts, a comparison analysis is made. The results show that the combination of the temperature velocity thermograph and computer vision algorithm is an effective method for the sticker breakout detection. The temperature velocities, geometry characteristics and propagation velocities of the abnormal regions are three important criteria for sticker breakout detection. This method also provides a technology for developing a more visual and intelligent mould monitoring system and is helpful to enhance the accuracy for the breakout prediction system.

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Mechanism of Formation and Method of Detection of Breakout Caused by Sticking between Mould and Slab in Continuous Casting of Steel

Cited by 7 publications

References 0 publications

Evaluation of Solidified Shell Thickness by Thermocouple in Mold

Evaluation of Solidified Shell Thickness by Thermocouple in Mold

Mechanism of a Hydrogen-induced Sticker Breakout in Continuous Casting of Steel: Influence of Hydroxyl Ions in Mould Flux on Heat Transfer and Lubrication in the Continuous Casting Mould

Visual detection based on computer vision for sticker breakout in slab continuous casting

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