Improving Cast Structure and Centerline Segregation of Continuously Cast Slabs by Adding Steel Strip into Mold

Habu, Yasuhiro; Itoyama, Seiji; Emi, Toshihiko; Sorimachi, Kenichi; Kojima, Hideaki

doi:10.2355/tetsutohagane1955.67.9_1498

Cited by 18 publications

(35 citation statements)

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“…Generally, the slab quality can be improved by generating a large amount of equiaxed grains and promoting a columnar to equiaxed transition (CET). Recently, an innovative method of feeding a consumable steel strip to the mold has been proposed by the Azovstal' Metallurgical Combine in Ukraine and the Kawasaki Steel Corporation in Japan, which can alleviate the central segregation and porosity defects of CC slab [7][8][9][10]. For the new technology, a thin consumable strip is continuously fed into the CC mold through a strip "feeder" at a desired feeding speed.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Solidification in the Cast Mold with a Consumable Cooler Introduced Inside

Niu

Liu

et al. 2019

Metals

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The microstructure is of great significance for the stability and mechanical performance of the cast slab. Recently, an innovative technology of feeding a consumable cooler into the mold has been proposed to improve the internal quality of castings. But the mechanism is not clear. In the present work, a water-cooled transparent laboratory equipment was set up and solidification of NH4Cl-70%H2O solution was studied to observe the in-situ growth and sedimentation of crystals. The experiments were conducted with and without adding a consumable cooler. Morphology variation of the solidification structure was visualized and temperature distribution during the process was recorded. Results show that introduction of the consumable cooler significantly reduces the temperature of the central zone. Melting of the consumable cooler can supply a large quantity of equiaxed crystals, which prevent the growth of columnar dendrites and thereby promote columnar to equiaxed transition (CET). Moreover, the enhanced convection shows an effect of grain refinement.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Solidification in the Cast Mold with a Consumable Cooler Introduced Inside

Niu

Liu

et al. 2019

Metals

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“…A few studies have also been carried out to investigate the potential impact of the strip feeding into the mold. Habu et al performed a series of strip feeding experiments on a casting slab with the thickness of 260 mm. The effect of the amount of additional strip on increasing the ratio of the equiaxed zone was also investigated.…”

Section: Introductionmentioning

confidence: 99%

Melting of Moving Strip during Steel Strip Feeding in Continuous Casting Process

Niu

Liu

et al. 2018

steel research int.

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Steel strip feeding into continuous casting mold is an innovative technology improving the slab quality through decreasing the melt superheat and increasing the proportion of equiaxed dendrites. To investigate the embedded complex melting and solidification processes, a mathematical model has been developed to model all the essential physical behaviors of the fluid flow, heat transfer, melting, and solidification during steel strip feeding into the mold. The enthalpy method is adopted to describe both the melting of steel strip and the solidification of slab. The complex heat transfer between cold steel strip and hot melt is considered. The melting of moving strip and the growth of solidified shell are compared with the experimental measurements and empirical equation, respectively. The validated model is then used to predict the melting and solidification characteristics during steel strip feeding into the mold. Based on the experimental and numerical findings, the whole melting process of steel strip can be divided into three periods: the steel sheath formation, steel sheath melting, and steel strip melting. Effects of the strip thickness (d0), melt superheat (ΔT), and strip feeding speed (va) on the melting of steel strip have been analyzed. An empirical equation is proposed to correlate the total melting time with aforementioned parameters: lntm=3.748+1.406lnd0−0.32lnva−0.794lnΔT. Furthermore, sensitivity study has also performed to reveal the influence of the strip thickness, melt superheat, and strip feeding speed on the final strip tip position.

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“…Then compete for growth space with each other and refine the grains. [16] For the current status, more observations are still needed to confirm the physical mechanism of the steel strip. Moreover, there still a lack of an effective way to specify the contribution rate of two functions of steel strip, which are reducing overheating and providing nucleation.…”

Section: Stage Iii: Steel Strip Meltingmentioning

confidence: 99%

“…Pilot production [16,18] and as-cast feeding experiment [25][26][27] have already indicated that a complete melting strip (which means D s is more shallow than the liquid core depth) and an appropriate R are necessary for a satisfying slab structure. Meanwhile, Equation (4), (10), and (14) shows that many parameters affect two or three of t m , D s , and R simultaneously, including physical parameters of liquid steel and steel strip, v f , d 0 , and ΔT.…”

Section: Heat Transfer At Pseudo-steady Statementioning

confidence: 99%

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Feeding Steel Strip Technology in Continuous Casting Process: A Review

Geng

Zhao²,

Zang

et al. 2021

steel research int.

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Improving Cast Structure and Centerline Segregation of Continuously Cast Slabs by Adding Steel Strip into Mold

Cited by 18 publications

References 0 publications

Experimental Investigation of Solidification in the Cast Mold with a Consumable Cooler Introduced Inside

Experimental Investigation of Solidification in the Cast Mold with a Consumable Cooler Introduced Inside

Melting of Moving Strip during Steel Strip Feeding in Continuous Casting Process

Feeding Steel Strip Technology in Continuous Casting Process: A Review

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