Method for manufacturing composite deoxidizer of molten...

C - Chemistry – Metallurgy – 21 – C

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C21C 7/06 (2006.01)

Patent

CA 2391910

The present invention relates to metallurgy and, in particular, the methods of the molten steel deoxidation and alloying with aluminium. According to the present invention there is provided a method of molten steel treating with Aluminium. Wherein the Aluminium is placed in the melt together with the Iron- based Alloy, and wherein the Aluminium and Iron-based Alloy are put into the Melt in the form of Composite with initial density which value is not less than 0.4, if compare to the molten steel's density, and which contain Al, C, Si, Mn and Fe, and wherein range of ingredients is as follows (% of mass): Al 25-50 C 0.05-0.90 Si 0.05-1.50 Mn 0.15-1.25 Fe the Rest, by the way, the composite contains Aluminium as the matrix component and other ingredients - in the form of Iron - based alloy and as the reinforced component by the way the Aluminium Dissolution in the molten steel is realized by the continuous increasing of the composite relative density to the value of 1.00-1.05. Application of the present invention ensures efficiency improvement of the molten steel treatment with Aluminium assimilation and aluminium losses decreasing.

La présente invention relève du domaine de la métallurgie et concerne, en particulier, des procédés de désoxydation de l'acier en fusion et d'alliages à l'aluminium. Elle concerne un procédé de traitement d'acier en fusion par l'aluminium. Selon ce procédé, l'aluminium est introduit dans la matière en fusion avec un alliage à base de fer, l'aluminium et l'alliage de fer se présentant sous forme d'un matériau composite dont la densité initiale est d'au moins 0,4 si on la compare à celle de l'acier en fusion, qui renferme Al, C, Si, Mn et Fe, et dont les ingrédients sont représentés comme suit en termes de pourcentages massiques: Al 25-50 C 0.05-0.90 Si 0.05-1.50 Mn 0.15-1.25, le reste étant constitué par du fer. Le matériau composite renferme de l'aluminium comme composante matricielle et d'autres ingrédients sous forme d'alliage de fer comme composante de renforcement. La dissolution de l'aluminium dans l'acier en fusion s'obtient en augmentant constamment la densité relative du matériau composite jusqu'à une valeur de 1,00-1,05. La présente invention permet d'améliorer l'efficacité du traitement de l'acier en fusion par assimilation d'aluminium et diminution des pertes d'aluminium.

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