Re-start Technology for Reducing Sticking-type Breakout in Thin Slab Caster

Moon, Chang-Ho; Lee, Duk Man; Moon, Suk Chun; Park, Hae-Doo

doi:10.2355/isijinternational.48.48

Cited by 10 publications

(5 citation statements)

References 2 publications

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“…In addition, breakouts also result in the lost of production time and significant yield penalties. Breakouts are broadly classified into two categories: sticking‐type breakout and cracking‐type breakout . There are several factors to influence breakouts in the casting process.…”

Section: Breakout Versus Heat Transfermentioning

confidence: 99%

Initial Solidification and Its Related Heat Transfer Phenomena in the Continuous Casting Mold

Wang

Zhu

Zhou

2017

steel research int.

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The initial solidification of molten steel in the mold is very important, as it is the origin of the final slab, which associates with the surface defects and determines the final quality of casting slab. In this article, six main topics, including the initial solidification study method, molten steel solidification, mold flux structure, fluid flow, oscillation marks formation, and breakout are reviewed with the purpose to explore the intrinsic mechanism of the complex initial solidification process and its related multi-phase heat transfer phenomena. The results summarized here can provide a foundational understanding of the initial solidification and heat transfer phenomena occurring in the continuous casting mold.

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Section: Breakout Versus Heat Transfermentioning

confidence: 99%

Initial Solidification and Its Related Heat Transfer Phenomena in the Continuous Casting Mold

Wang

Zhu

Zhou

2017

steel research int.

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“…According to the method of Tsuneoka, Moon et al. [11] analysed the mechanism of tearing and repairing of shell for thin slab continuous casting process, and obtained the recovery conditions of the sticking-induced rupture. And to further make up for the lack of Tsuneoka, by combining recovery conditions of the rupture and thickness requirement of the newly formed shell at the rupture, the recovery parameters of the sticking-type breakout were deduced quantitatively, such as the minimum healing speed and its holding time, decreasing speed gradient and increasing speed gradient.…”

Section: Theory and Mathematical Model Of Sticking-type Breakout Reco...mentioning

confidence: 99%

Recovery mechanism of the sticking-type breakout during continuous casting of steel

Qian

Xie

et al. 2017

Ironmaking & Steelmaking

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Sticking-type breakout is one of key factors which restrict the development of high-speed or wideheavy plate continuous casting technology. In order to better heal and control the sticking-type breakout, this paper presents a comprehensive study for its recovery mechanism. First, according to force characteristics of solidified shell at mold exit, calculation method of safe shell thickness is proposed. Then, considering sticker propagation behaviour and safe shell thickness, a more practical recovery model of sticking-type breakout is established and verified by actual examples. The result shows the proposed recovery strategies avoid casting speed to be decreased too low or cast stop, thus save unnecessary operating time, and are better than original strategies. Furthermore, influencing factors of recovery behaviour are analyzed. The result shows hot spot location, operating casting speed, and mold oscillation frequency have a significant effect on minimum speed for the recovery and oscillation stoke has little influence on it.

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“…In particular, the electromagnetic brake adopted a new magnet type specially designed for the thin-slab casting funnel-shaped mold [14]. Furthermore, authors like Wang et al [15] studied predicting transient fields in the caster using a large eddy simulation and an enthalpy-porosity method; such a method helps predict the solidification shell in addition to increasing the possibility of washing the solidified steel crust [16] and possible wire breakage [17]. Also, there are other consequences to consider: slag trapping toward the sinus of liquid metal [18,19], slag droplets into steel volume [20], the movement of inclusions [13], and the possible reoxidation of the liquid steel due to the opening of the slag [21,22], as has been shown through numerical simulation techniques using colorimetry and PIV [23].…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of the Internal Geometry of a Nozzle for a Thin-Slab Continuous Casting Mold

Chiwo,

Susunaga-Notario,

Betancourt-Cantera

et al. 2023

Designs

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Understanding the phenomena that cause jet oscillations inside funnel-type thin-slab molds is essential for ensuring continuous liquid steel delivery, improving flow pattern control, and increasing plant productivity and the quality of the final product. This research aims to study the effect of the nozzle’s internal design on the fluid dynamics of the nozzle-mold system, focusing on suppressing vorticity generation below the nozzle’s tip. The optimized design of the nozzle forms the basis of the results obtained through numerical simulation. Mathematical modeling involves fundamental equations, the Reynolds Stress Model for turbulence, and the Multiphase Volume of Fluid model. The governing equations are discretized and solved using the implicit iterative-segregated method implemented in FLUENT®. The main results demonstrate the possibility of controlling jet oscillations even at high casting speeds and deep dives. The proposed modification in the internal geometry of the nozzle is considered capable of modifying the flow pattern inside the mold. The geometric changes correspond with 106% more elongation than the original nozzle; the change is considered 17% of an inverted trapezoidal shape. Furthermore, there was a 2.5 mm increase in the lower part of both ports to compensate for the inverted trapezoidal shape. The newly designed SEN successfully eliminated the issue of jet oscillations inside the mold by effectively preventing the intertwining of the flow. This improvement is a significant upgrade over the original design. At the microscale, a delicate force balance occurs at the tip of the nozzle’s internal bifurcation, which is influenced by fluctuating speeds and ferrostatic pressure. Disrupting this force balance leads to increased oscillations, causing variations in the mass flow rate from one port to another. Consequently, the proposed nozzle optimization design effectively controls microscale fluctuations above this zone in conjunction with changes in flow speed, jet oscillation, and metal–slag interface instability.

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Re-start Technology for Reducing Sticking-type Breakout in Thin Slab Caster

Cited by 10 publications

References 2 publications

Initial Solidification and Its Related Heat Transfer Phenomena in the Continuous Casting Mold

Initial Solidification and Its Related Heat Transfer Phenomena in the Continuous Casting Mold

Recovery mechanism of the sticking-type breakout during continuous casting of steel

Design and Optimization of the Internal Geometry of a Nozzle for a Thin-Slab Continuous Casting Mold

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