Strip formation and process stability in twin roll strip casting

Badowski, Mark; Hentschel, L; Kopp, Reiner; Schmitz, W.; Senk, Dieter

doi:10.1002/srin.200100155

Cited by 6 publications

(8 citation statements)

References 1 publication

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“…In some cases the backward metal flow may lead to buckling of solidified steel on roll surface, an irregular solidification rate and vibrations of the twin-roll caster. 43) The modified treatment of liquid steel provides smooth and uniform micro topography of the cast strip surface as shown in Fig. 15.…”

Section: Fig 11mentioning

confidence: 99%

Quality Improvement of Cast Strip by Temperature Treatment of Liquid Metal

Zapuskalov¹

2004

ISIJ International

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The temperature at which a liquid metal is heated may be a source of variation in the quality of as-cast strips. The present study focuses on stabilization of the casting process and improving the quality of as-cast strip by temperature treatment of liquid metal.At the condition of constant cooling rate it was found that the degree of melt overheating changes the characteristics of solidification as well as the as-cast properties. The phenomenon is interpreted from point of view of different structure of liquid metal at different temperature. At low degrees of overheating, solidification depends on the inherited inter-atomic structure from the solid state. At high degrees of overheating this inherited structure is destroyed and the melt becomes more homogeneous.Typical and modified melting cycles were compared, to determine the influence of overheating on the ascast strip quality. The modified cycle resulted in a more stable process and produced higher quality cast strip with better surface finish, a lower degree of segregation and less internal stress.

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Section: Fig 11mentioning

confidence: 99%

Quality Improvement of Cast Strip by Temperature Treatment of Liquid Metal

Zapuskalov¹

2004

ISIJ International

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“…Thin slab casting process is similar to conventional slab casting by the common principle of the oscillating mould; casting velocity at a thickness ratio of about 4: 1 is higher. In this paper slab casting and twin roll casting (TRC) [3], figure 2, shall be compared; in both cases the mass flow of steel is the same by assumption, table 1.…”

Section: Comparison Of Processesmentioning

confidence: 99%

“…By reducing the main differences between slab and strip casting processes on • fluid dynamics • superheat • meniscus protection the consequences on SEN clogging, figure 3, and cleanness of aluminium killed low carbon steel shall be estimated.…”

Section: Modellingmentioning

confidence: 99%

Conditions of Liquid Steel Treatment for Near Net‐Shape Casting Processes

Senk¹,

Mavrommatis

2003

steel research international

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Slab casting for hot rolled steel and strip casting using the twin roll casting (TRC) method are compared in terms of inclusions evolution.There are differences of the processes, mainly the use of casting flux in CC of slabs, or pool shapes and sizes in terms of TRC, particularly when roll diameters vary. The inclusion evolution of alumina in a low carbon steel grade was estimated. By modelling particle growth rate, coagulation and deposition, an 'agglomeration index' was created to describe the probability of clogging in the SEN. Similarly the growth of secondary alumina precipitation during cooling of the melt in the pool by Stokes collision and turbulent collision was estimated in terms of forming large particles which are able to float-up. Influences of melt superheat or caster size were taken into account. Prozessparameter fur Stahlschmelzen beim endabmessungsnahen GieBen. Das BrammenstranggieBen fOr die Warmbancferzeugung und das BandgieBen nach dem Zweirollen-Vertahren werden in Bezug auf die Einschlussbildung verglichen. Die Prozessunterschiede liegen in der Hauptsache in der Anwendung von GieBpulver beim Brammenstrangguss und in der PoolgroBe und -form beim Zweirollen-bandgieBen, insbesondere wenn der Rollendurchmesser variiert wird. Die Entwicklung von TonerdeeinschlOssen in einem weichen Kohlenstoffstahl wurde abgeschatzt. In die Modellierung der Teilchenwachstumsrate, Koagulation und Abscheidung wurde ein .Agglomerationsindex" eingefOhrt, der zur Vorhersage des Zusetzens von Tauchrohren genutzt werden kann. In ahnlicher Weise wird das Wachstum von Sekundar-Tonerdeausscheidungen durch Stokes-Kottision und turbulente Kollision wahrend der AbkOhlung der Schmelze abgeschatzt, um die Bildung groBerer, abscheidbarer EinschlOsse zu beschreiben. EinflOsse der Schmelzenuberhitzung und der GieBanlagengroBe wurden be-rOcksichtigt.

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“…116) The rate of deformation in the casting direction is dependent on many variables, 102) and may be greater in the backward direction than in the forward direction. 117) Too high a pressure causes excessive strip deformation and this is not desirable as it leads to segregation of lowmelting point elements that crystallize late in solidification.…”

Section: Strip Casting Processmentioning

confidence: 99%

“…88) Additionally the length of the deformation zone between the rolls increases with the roll diameter and this creates a more stable casting process. 102) However the upper diameter of the rolls is limited by the practicalities of designing a ceramic nozzle to deliver the melt. Additionally, the higher the diameter of the rolls the larger and more expensive are the ceramic side dams necessary for containing the melt.…”

Section: Strip Casting Processmentioning

confidence: 99%