Cooling Behavior and Slab Surface Quality in Continuous Casting with Alloy 718 Mold.

Yamauchi, Akira; Itoyama, Seiji; Kishimoto, Yasuo; Tozawa, Hirokazu; Sorimachi, Kenichi

doi:10.2355/isijinternational.42.1094

Cited by 23 publications

(15 citation statements)

References 10 publications

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“…The data of q and k in the previous paper 9) were used. Previously reported values about K eff [17][18][19][20][21] are listed in Table 3. They were evaluated by various methods.…”

Section: Interfacial Thermal Resistancementioning

confidence: 99%

Flux Film in the Mold of High Speed Continuous Casting

Hanao¹,

Kawamoto²

2008

ISIJ Int.

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“…The data of q and k in the previous paper 9) were used. Previously reported values about K eff [17][18][19][20][21] are listed in Table 3. They were evaluated by various methods.…”

Section: Interfacial Thermal Resistancementioning

confidence: 99%

Flux Film in the Mold of High Speed Continuous Casting

Hanao¹,

Kawamoto²

2008

ISIJ Int.

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“…In any way, mild cooling has been considered to be an effective countermeasure against the uneven solidification. 12) So, the mild cooling of initial solidification has been tried by means of fine grooves on the surface of mold, 13,14) application of materials of low thermal conductivity to the mold, 15,16) decrease of coolant flow rate in the mold, 17) crystallization of the film which mold flux forms after infiltration along the mold. 11,[18][19][20] It is necessary to estimate solidification parameters of the solidified shell in order to understand and improve the initial solidification in the mold.…”

Section: Introductionmentioning

confidence: 99%

Growth of Solidified Shell Just below the Meniscus in Continuous Casting Mold

Hanao¹,

Kawamoto²,

Yamanaka³

2009

ISIJ Int.

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In the high speed continuous casting of hypo-peritectic steel slabs, growth of solidified shell just below the meniscus in the mold was researched. Rate of cooling and solidification was estimated on the basis of experimental results of thickness profiles of solidified shell, heat flux in the mold and dendrite arm spacing in the solidified structure beneath the surface of the slabs cast at 3-5 m/min.As a result, it was found that there is a delaying period of solidification growth at the beginning, till the shell grows up to about 1 mm thick. After that, it grows in linear relation to square root of solidification time. Dealing with the thickness profiles as a function of solidification time and solidification rate was obtained by differential. Furthermore, cooling rate of the shell was estimated with this solidification rate and heat flux in the mold. This cooling rate showed good agreement with that estimated from dendrite secondary arm spacing of the slabs.Estimated cooling rates were compared with the slabs by conventional continuous caster at 1.1-1.6 m/min and the influence of casting speed was discussed. It resulted in that cooling rate increases with casting speed and the difference by casting speed begins to be remarkable in the period of 0.1-1 s for solidification time, when uneven solidification just begins to occur. This agreement was considered to be one of the reasons why uneven solidification or longitudinal surface cracking of slabs tends to occur with increase of casting speed.

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“…6) As the controlling factors of mold flux against these physical phenomena, density difference from molten steel, 4,5) viscosity 4) and interfacial tension 4) are mainly considered, and increase of these physical properties is an effective countermeasure to entrapment. Conventional mold flux for ultra-low carbon steel cast has solidification temperature of 1 163-1 413 K and viscosity at 1 573 K of 0.08-0.41 Pa · s. [7][8][9][10][11] It appears to be that these values have been controlled to maintain the lubrication in the mold, and increased viscosity so as to prevent the involvement. Basicity, defined to be the mass percent ratio of total CaO to SiO 2 , of mold flux has been settled in the range of 0.78-1.04 in order to keep its viscosity.…”

Section: Introductionmentioning

confidence: 99%