Fundamental Study and Its Application of Surface Defects of Powder Cast Strands

Kawakami, Kiminari; Kitagawa, Toru; Mizukami, Hideaki; Uchibori, Hideo; Miyahara, Shinobu; Suzuki, Mikio; Shiratani, Yusuke

doi:10.2355/tetsutohagane1955.67.8_1190

Cited by 29 publications

(17 citation statements)

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“…20,21) However, it is considered that flux flows in the positive strip period of oscillation, and during this period, the shear rate is maximum; therefore, in this research, a shear rate of 125 1/s at the lubrication area was used as a representative value.…”

Section: Preparation Of Mold Flux Containing Nitrogenmentioning

confidence: 99%

Development of New Mold Flux for Continuous Casting Based on Non-Newtonian Fluid Properties

Watanabe¹,

Tsutsumi²,

Suzuki³

et al. 2014

ISIJ Int.

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Due to the importance of the physical and chemical properties of the mold flux used in the production of high-quality steel, in particular the suppression of surface defects on steel sheets, steelmaking engineers have attempted to develop new types of mold flux. This paper presents the results of research on entrapment of mold flux and on heat transfer between the mold and the solidified shell. The authors have been developing a mold flux with non-Newtonian fluid properties using nitrogen. That is, the viscosity of the molten mold flux is low at a high shear rate to reduce the friction between the mold and the solidified shell, but is high at a low shear rate to prevent mold flux entrapment. In order to approximate the properties of mold flux as a non-Newtonian fluid, nitride is added to the conventional flux to adjust the silicate network structure through the reaction between nitrogen and calcium. The contact angle of the nonNewtonian mold flux, which represents the wettability between the mold and the solidified shell, is low in comparison with that of the normal mold flux without nitrogen. It is suggested that the non-Newtonian mold flux increases the heat transfer between the mold and the solidified shell. A casting test was carried out using this non-Newtonian mold flux, and the results showed that entrapment of mold flux decreased and heat transfer increased, as assumed.

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Section: Preparation Of Mold Flux Containing Nitrogenmentioning

confidence: 99%

Development of New Mold Flux for Continuous Casting Based on Non-Newtonian Fluid Properties

Watanabe¹,

Tsutsumi²,

Suzuki³

et al. 2014

ISIJ Int.

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show abstract

“…Many researchers have illustrated the schematic drawings of the part of meniscus in the mold [1][2][3][4][5][6][7][8][9] and one example of these drawings is shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Relation between the Traces of Nucleation on the Surface and Grain in the Condition of Continuous Casting of Steel

et al. 2008

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They also found discs in Al-Cu alloys. They also made metallurgical characterization on discs. They concluded that the disc was a nucleation site and alloy melt did not un- Vol. 48 (2008), No. 3, pp. 270-276 Relation Control of nucleation on the surface of solidified shell is of importance to establish the whole structure of continuously-cast products. In the conventional continuous casting of steel, the nucleation of steel takes place on the molten state of mold flux. Lab-scale dipping tests have been carried out, where the solidification satisfied the above-mentioned condition. Changing the material of chill block and mold flux, the cooling rates of initial solidification have been varied systematically. The detailed observations of the surfaces and cross section of solidified shells have been made.The grain size was affected by cooling rate and decreased monotonously with increasing cooling rate. Many small protrusions have been found on the surface of the solidified shell. They resembled discs as Biloni et al. named. The density of discs was affected by cooling rate and increased with increasing cooling rate. The effective nucleation ratio was defined as the ratio between the number of grains and that of discs. The effective nucleation ratio obtained was a few percent and indicated small dependence on cooling rate in the range of this study.KEY WORDS: initial solidification; nucleation; dendrite; grain; disc.

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“…1,2) Surface cracks on the bloom surface tend to occur at the bottom of OSM. This tendency is considered to be due to not only the notch effect of OSM 3,4) but also coarse g grain. Higher cooling rate 5) and the use of non-metallic inclusions 6) are refining methods for g grain.…”

Section: Introductionmentioning

confidence: 99%

Austenite Grain Refining of As-cast Bloom Surface by Reduction of Oscillation Mark Depth

2008

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Fundamental Study and Its Application of Surface Defects of Powder Cast Strands

Cited by 29 publications

References 0 publications

Development of New Mold Flux for Continuous Casting Based on Non-Newtonian Fluid Properties

Development of New Mold Flux for Continuous Casting Based on Non-Newtonian Fluid Properties

Relation between the Traces of Nucleation on the Surface and Grain in the Condition of Continuous Casting of Steel

Austenite Grain Refining of As-cast Bloom Surface by Reduction of Oscillation Mark Depth

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