Molding powder for continuous casting of thin-slab

B - Operations – Transporting – 22 – D

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B22D 11/07 (2006.01) B22D 11/10 (2006.01) B22D 11/111 (2006.01)

Patent

CA 2303825

A molding powder, characterized in that it has a CaO/SiO2 weight ratio ranging 0.50 to 1.20, comprises one or more compound selected from the group consisting of an oxide, a carbonate and a fluoride of an alkali metal, an alkaline earth metal and other metals, and 0.5 to 5 weight % of carbon powder, has a Li2O content ranging 1 to 7 wt% and an F content ranging 0.5 to 8.0 wt.%, has a crystallization temperature ranging 1000 to 1200 °C, has a surface tension of 250 dyn/cm or more, and a viscosity .eta. (poise) at 1300 °C satisfies a relational formula including a casting rate V (m/min): 6.0 < .eta. V < 100Ø The molding powder enables a powder slab to be almost free from entanglement in a mold and a continuous casting of a thin slab to be operated with stability.

Cette poudre à mouler, caractérisée par le fait que le rapport pondéral CaO/SiO2 s'échelonne entre 0,50 et 1,20, comprend un composé, ou plus, sélectionnés dans le groupe constitué par un oxyde, un carbonate et un fluorure d'un métal alcalin, d'un métal alcalino-terreux et d'autres métaux, et de 0,5 à 5 %, en pourcentage pondéral, de poudre de carbone. La teneur de cette poudre en LiO2 est comprise entre 1 et 7 % en pourcentage pondéral et la concentration en F est comprise entre 0,5 et 8 % en pourcentage pondéral. La température de cristallisation de cette poudre est comprise entre 1000 et 1200 DEG C, sa tension superficielle est de 250 dyn/cm ou davantage et sa viscosité eta (poise) satisfait à une formule relationnelle incluant un taux de coulée V (m/min) : 6,0 < eta V < 100,0. La structure de cette poudre à mouler est telle que la poudre servant à mouler la plaque est quasiment exempte d'enchevêtrement dans le moule et que le coulage en continu demeure stable.

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