Continuous casting facility and a process for producing thin...

B - Operations – Transporting – 22 – D

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B22D 11/10 (2006.01) B22D 11/111 (2006.01) B22D 11/12 (2006.01) B22D 11/14 (2006.01)

Patent

CA 2181908

The invention is directed to a process and to a continuous casting installation for the production of thin slabs, preferably of steel with a predetermined solidification thickness of, e.g., 50 mm, in which an optimum surface quality and internal quality of the strand with minimal and predetermined solidification thickness and plant capacity, and accordingly minimal rolling effort, is achieved by the introduction and optimal combination of such elements as the following: continuous casting and rolling in the region of the strand guide (segment 0), cambered mold which opens up in cross section from the mold outlet to the mold inlet, hydraulically driven lifting platform, casting powder and feed thereof, immersion nozzle with specific flow cross section. A qualitative adjustment of the above-mentioned parameters relating to the process and continuous casting installation results in a favorable and satisfactory casting slag supply and bath movement in the cast surface compared with a standard slab with a thickness of 200 mm. These conditions from the crater end to the cast surface exert a direct influence on the superficial and internal quality of the strand and on the reliability of the casting process.

L'invention concerne un procédé et une installation de coulée continue permettant de produire des brames minces, de préférence en acier, d'une épaisseur de solidification de 50 mm par ex. Selon ce procédé, pour parvenir à une qualité optimale à l'intérieur et en surface du métal coulé, tout en ayant une épaisseur de solidification ou une capacité prédéterminée minimale de l'installation et par conséquent une complexité technique minimale en ce qui concerne le laminage, on utilise et on combine optimalement les éléments suivants: laminage de coulée continue dans la zone du guide pour barre de coulée (segment 0), coquille bombée dont la section transversale augmente entre l'entrée et la sortie, plate-forme de levage actionnée de manière hydraulique, poudre de coulée et son amenée, système d'évacuation par immersion, à section transversale d'écoulement spécifique. Comparativement à une brame standard de 200 mmm d'épaisseur, l'harmonisation qualitative de ces paramètres concernant le procédé et l'installation de coulée continue permet de parvenir à une alimentation en laitier de coulée et à un mouvement du bain satisfaisants dans le ménisque. Ces conditions influent directement du sommet du bassin de coulée jusqu'au ménisque, sur la qualité intérieure et superficielle du métal coulé, ainsi que sur la fiabilité du procédé de coulée.

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