Method of and smelter for producing steel with high...

C - Chemistry – Metallurgy – 21 – C

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C21C 5/28 (2006.01)

Patent

CA 2576444

A method of and a smelter for producing steel (1) with a high manganese and low carbon content on the basis of liquid pig iron (2) or liquid steel (3) and slag-forming constituents (4) with the object of preventing existing drawbacks of process route in vessels other than, e.g., electrical arc furnaces (18). With steel produced with a high manganese and low carbon content, in a process, the carbon component is reduced to about .7-.8% by a combined blowing of oxygen (7) through top lances (8) and underbath nozzles (9) after feeding of liquid ferro-manganese (50 and liquid steel (3a) in a FeMn-refining converter (6a), wherein a component of a, cold end product from premelt is added as cooling means (10), and wherein the carbon component is reduced to about .05-.1%C by a continuous blowing of oxygen (7) through the underbath nozzles.

L'invention concerne un procédé et une fonderie servant à produire de l'acier (1) ayant une teneur élevée en manganèse et une teneur faible en carbone à partir de fonte liquide (2) ou d'acier liquide au carbone (3a) et de fondants de scorification (4). L'invention vise à éviter les inconvénients actuels du processus réalisé dans d'autres contenants, des fours à arc électrique (18) par exemple. Selon l'invention, le processus est amorcé par l'introduction de ferromanganèse liquide (5) et d'acier liquide (3a) dans un convertisseur d'affinage FeMn (6a) et la teneur en carbone est réduite à environ 0,7 à 0,8 % par le soufflage combiné d'oxygène (7) par des lances de gueulard (8) et des buses (9) immergées dans le bain. Une partie du produit final froid d'une première fusion est ensuite introduit en tant que réfrigérant (10) et la teneur en carbone est abaissée à environ 0,05 à 0,1 % C par injection continue d'oxygène (7) par les buses immergées (9).

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