Thin cast strip formed of molten steel, process for its...

B - Operations – Transporting – 22 – D

Patent

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B22D 11/06 (2006.01)

Patent

CA 2204404

A twin drum-type continuous casting process for casting thin cast strip by solidifying molten steel continuously fed between a pair of cooling drums placed parallel to each other, wherein the cooling drums are given an added degree of concave crown such that a solid fraction at the thickness center of the thin cast strip, when the distance from the edges toward the center of the thin cast strip at the closest position of said cooling drums is within 50 mm, is exhibited which is a value greater than the fluid critical.solid fraction, or alternatively the cooling rate near the edges of the cooling drums is improved.

Cette invention concerne un procédé de coulage continu à double cylindre assurant une alimentation continue en acier fondu entre deux cylindres refroidisseurs montés en parallèle en vue de la solidification à leur niveau, l'acier fondu étant coulé en une pièce fine. Une quantité de couronne concave est envoyée vers les cylindres refroidisseurs au niveau de la position la plus proche de ces derniers. La vitesse de formation de la phase solide, au centre dans le sens de l'épaisseur de la pièce fine coulée, dans une fourchette correspondant à une distance d'une extrémité de la pièce vers une partie centrale ne dépassant pas 50 mm, donne une valeur supérieure ou égale à la vitesse de formation de la phase solide à la limite de fluidité, tandis que l'efficacité de refroidissement à proximité de la partie d'extrémité du cylindre refroidisseur est améliorée.

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