File:Affinage convertisseur Thomas - Procédé VLN.svg

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Français : Évolution de la composition chimique de la charge, pendant le soufflage dans un convertisseur Thomas.

L'air soufflé consiste en un mélange de vapeur et d'oxygène. Ce procédé est appelé VLN (Very Low Nitrogen).

Le début du soufflage peut être éventuellement réalisé avec de l'air enrichi à 30% d'oxygène. Cette pratique permet d'enfourner 6 à 9 % de ferrailles, et de diminuer la teneur en azote de l'acier.
English: Evolution of chemical composition of the liquid steel, during the blowing in a Thomas (basic Bessemer) converter.

The air blown is a mixture of oxygen and steam. This process is called VLN (Very Low Nitrogen).

The beginning of the blow may possibly be carried out with air enriched with 30% oxygen. This practice allows to melt 6 to 9% of scraps, and to decrease the nitrogen content in the steel.
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Source Own work, from A. M. CLARK & J. L. HARRISON , Problemas de la Industria Siderúrgica y de Transformación de Hierro y Acero en América Latina, « Aspectos técnico-económicos del empleo del oxígeno en la fabricación de acero, especialmente en el caso del convertidor ordinario »
Author Borvan53


 
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