Effect of Mold Oscillation Curves on Heat Transfer and Lubrication Behaviour in Mold at High Speed Continuous Casting of Steel Slabs

Suzuki, Mikio; Miyahara, Shinobu; Kitagawa, Toru; Uchida, Shigetaka; Mori, Tatsuya; Okimoto, Kazutaka

doi:10.2355/tetsutohagane1955.78.1_113

Cited by 30 publications

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“…4 20) against the remaining time in a mold. The local heat flux during the conventional slab casting given by Suzuki et al,21) and Grilles,22) and a medium thickness slab casting by Watanabe, et al, are plotted in this figure. Comparing the local heat fluxes by Suzuki et al and Watanabe et al with that by Grilles, a large difference appears within about 10 sec. After about 10 sec the local heat flux is comparatively in good agreement with one another.…”

Section: Heat Transfer and Lubrication Phenomena Inmentioning

confidence: 99%

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Suzuki

Nakada

2001

ISIJ International

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Two decades ago the casting speed of the conventional slab continuous caster was increased stepwise to a level over 2 m/min. Henceforth, the casting speed has been remained a similar level. In this review the reasons for constraining the casting speed are discussed. As a result the constraints of the high-speed casting are thought mold powder entrapment and longitudinal facial crack occurring in high-speed casting.Some measures to prevent the mold powder entrapment and the longitudinal facial crack are discussed. Resultantly the research issues we should develop are considered such as prevention of alumina built-up in a submerged entry nozzle, control of fluid flow in a mold and control of heat transfer through mold powder film interved between a solidifying shell and a mold wall. They are most important to realize the high-speed continuous casting of conventional slab.KEY WORDS: high-speed casting; conventional slab; mold powder entrapment; longitudinal facial crack; upper limit of casting speed.order to realize the ideal process, i.e., full hot direct rolling, technologies for more stability of the casting practice and the production of higher slab quality should be realized.The casting speed of the conventional slab caster with an oscillating mold has been remained a 2 m/min level because such higher-speed casting deteriorates slab quality. Therefore, we will investigate what the factors for restraining the casting speed of the conventional slab caster are. Present State of High-speed Continuous Casting of Steel Slab Trend of Casting Speed of Conventional SlabContinuous Caster We will survey the present state of high-speed casting in a conventional slab caster. The trend of the casting speed is shown in Fig. 3 10) for the conventional slab casters in Japanese steel companies. The main specifications and the casting speed are listed in Table 1 of the conventional slab casters. [11][12][13][14][15][16][17][18] The casting speed has been stepwise increased and attained approximately twice in two decades. Fifteen years ago a synchronized operation began between a continuous caster and a hot strip mill, i.e., hot direct rolling. 19) Since the hot direct rolling operation needs the productivity of the caster to be met to that of the hot strip mill, the casting speed should be increased. Heat Transfer and Lubrication Phenomena inContinuous Casting Mold at High-speed Casting The infiltration of liquid powder into a shell/mold gap is a very important process in continuous casting since it is necessary to ensure both good lubrication and uniform heat transfer between a shell and a mold. Failure to provide these conditions could result in the creation of surface defects and sticker breakouts.We will survey the heat transfer and the lubrication phenomena in a mold at a casting speed over 2 m/min of slab casters.Local heat flux in casting of low carbon Al killed steel is shown in Fig. 4 20) against the remaining time in a mold. The local heat flux during the conventional slab casting given by Suzuki et al.,21) and Grilles...

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Section: Heat Transfer and Lubrication Phenomena Inmentioning

confidence: 99%

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Suzuki

Nakada

2001

ISIJ International

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“…It was, therefore, concluded that the casting conditions on which the thickness of powder film became thick improved the lubrication, so that, the friction force decreased. These results were corresponded with the experience of industrial continuous casting machine, 3,13) so that this experimental equipment might simulate the lubricant behavior of mold powder of industrial continuous casting process.…”

Section: Effect Of Measured Thickness Of Mold Powdermentioning

confidence: 99%

“…The modification rate of non- sin. wave was adopted the 40% based on the experiment after Suzuki et al 3) because the larger modification rate of non-sin. wave got the distinct results between sin.…”

Section: Methodsmentioning

confidence: 99%

“…After that, Mizukami et al 2) and Suzuki et al 3) researched various oscillation waves and developed non-sinusoidal (non-sin.) oscillation from sinusoidal (sin.)…”

Section: Introductionmentioning

confidence: 99%

“…oscillation has made the casting speed increase furthermore by 0.5 m/min in comparison with sin. oscillation 3) . And it has achieved high productivity in a continuous casting process.…”

Section: Introductionmentioning

confidence: 99%

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Inflow Behavior Observation of Molten Mold Powder between Mold and Solidified Shell by Continuous Casting Simulator Using Sn-Pb Alloy and Stearic Acid.

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Experimental Study on Mold Flux Lubrication for Continuous Casting

Yang

Meng

Zhu

2013

steel research int.

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A new experimental apparatus for simulating mold oscillation of continuous casting was developed to clarify the flux lubrication mechanism in mold channel. Mixed oil which was simulated mold flux was poured and infiltrated down into the channel, and the consumption, liquid level and pressure of mixed oil were detected in the process of oscillation as well as the mechanism of flux process. The results show that the channel of flux with a profile becomes wider along the casting direction, and the lag time of periodical shifting pressure to the oscillating motion is strongly dependent on the flux viscosity and oscillation frequency. The liquid film thickness of flux has a significant influence on the infiltration behavior compared with the oscillating motion of the mold. The liquid flux infiltrates down from the end of positive strip time to the beginning of next positive strip time, and the infiltration is largely dependent on the negative strip time in between. The increase of viscosity of flux, casting speed and oscillation frequency enhances the liquid friction due to the reduction of the mold flux consumption. On the contrary, the higher non-sinusoidal oscillation factor improves the infiltration and decreases the frictional force. The oscillation amplitude increases the consumption and liquid friction slightly.

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Effect of Mold Oscillation Curves on Heat Transfer and Lubrication Behaviour in Mold at High Speed Continuous Casting of Steel Slabs

Cited by 30 publications

References 0 publications

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Perspectives of Research on High-speed Conventional Slab Continuous Casting of Carbon Steels.

Inflow Behavior Observation of Molten Mold Powder between Mold and Solidified Shell by Continuous Casting Simulator Using Sn-Pb Alloy and Stearic Acid.

Experimental Study on Mold Flux Lubrication for Continuous Casting

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