Method and device for producing stainless steel without...

C - Chemistry – Metallurgy – 21 – C

Patent

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C21C 5/00 (2006.01) C21C 7/06 (2006.01) C21C 7/068 (2006.01)

Patent

CA 2671148

The aim of the invention is to produce stainless steel for all stainless steel products both in the austenitic and the ferritic range, based on liquid pig-iron and FeCr solids, without using a supply of electrical energy. According to the invention, the liquid pig-iron, after being pre-treated in a blast furnace (1), is subjected to a DDD treatment (dephosphorisation, desiliconisation and desulphuration), is heated, finished or alloyed and deoxidated. The quantity of slag-free liquid pig-iron that has been pre-treated in the blast furnace (1) and a DDD device (2) is separated and introduced into two classic "twin" AOD-L converters (3, 4), where the required chemical process steps (of the heating, decarburisation and alloying stages) take place in parallel contrary processes using autogenous chemical energy, the heating stage being carried out first in the first twin AOD-L converter (3) and the decarburisation being carried out first in the second twin AOD-L converter (4).

L'objectif de l'invention est de produire de l'acier inoxydable pour tous produits en acier inoxydable à la fois austénitiques et férritiques, à base de fonte brute liquide et de FeCr solides, sans utiliser d'énergie électrique. Selon l'invention, la fonte brute liquide, après avoir été préchauffée dans un haut-fourneau (1), est soumise à un traitement DDD (déphosphorisation, désiliciumisation, et désulphuration), est chauffée, purifiée ou alliée et désoxydée. La quantité de fonte brute liquide sans laitiers qui a été prétraitée dans le haut-fourneau (1) et dans un dispositif DDD (2) est séparée et introduite dans deux convertisseurs (3, 4) jumeaux AOD-L, les étapes du processus chimiques nécessaires (de chauffage, de décarburation, et d'alliage) sont réalisées dans des processus contraires parallèles au moyen d'une énergie chimique autogène, l'étape de chauffage étant réalisée dans le convertisseur (3) jumeau AOD-L et la décarburation étant réalisée dans le second convertisseur (4) jumeau AOD-L.

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