Method for continuously casting steel sheets and apparatus...

C - Chemistry – Metallurgy – 21 – D

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C21D 8/02 (2006.01) B22D 11/06 (2006.01)

Patent

CA 2216743

The carbon content in molten steel is adjusted to be a value not lower than 0.001%, and a thin steel strip is made from this molten steel using a twin drum type continuous casting apparatus by means of direct casting. The thus obtained slab is given a reduction of not lower than 10%. The coagulated steel strip is cooled to a temperature not higher than the temperature determined by a function of the carbon content, cooling speed and ratio of reduction of in-line. After that, the steel strip is reheated and then cooled again to a temperature not higher than the temperature determined by the function of the carbon content. Then the cooled steel strip is coiled. In the above process, a metallic sheet, the surface of which is smooth and the metallic structure of which is fine, can be produced.

La teneur en carbone de l'acier en fusion est établie de manière à ne pas être inférieure à 0,001 %, et une mince bande d'acier est fabriquée à partir de l'acier en fusion au moyen d'un dispositif de coulée en continu à deux tambours grâce à la coulée directe. La brame ainsi obtenue subit une réduction qui n'est pas inférieure à 10 %. La bande d'acier solidifiée est refroidie à une température qui ne dépasse pas la température déterminée à l'aide d'une fonction de la teneur en carbone, de la vitesse de refroidissement et du rapport de réduction en continu. La bande d'acier est ensuite chauffée et refroidie une autre fois à une température qui ne dépasse pas la température déterminée sous forme de fonction de la teneur en carbone. La bande d'acier refroidie est alors enroulée. Grâce à ce procédé, il est possible de fabriquer une tôle métallique à surface lisse et à texture fine.

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