Per: renato alcantara de aguiar santana (Aperam South America), André Luis Barroso Carvalhido (APERAM SOUTH AMERICA), Janeir Ribeiro Dutra (APERAM SOUTH AMERICA), Julio Cezar Mariano Araujo (APERAM SOUTH AMERICA), Letícia Paraguai Irias Pereira (APERAM SOUTH AMERICA), Lucas Matheus Magalhães Silva (APERAM SOUTH AMERICA), Aloísio Louzada (vamservice)
Abstract:
With the challenge of reducing silicon consumption in the production of electrical steels (GNO), without compromising compliance with the optimized chemical composition range specified by integrated metallurgy, in order to guarantee product quality. The main objective is to study the O2 blow in the VOD process, adequate selection of silicon alloys and standardization of decontamination of the supply circuit. Due to the goal of meeting the optimized chemical composition of carbon in GNO steel (P920P) (C<0.0023%) having increased from 50% in 2016 to 80% in 2022, it was necessary to work with greater oxidation of the liquid steel of runs in the steelworks increasing the consumption of pure silicon. Therefore, the technical team's challenge was to adapt the process's O2 blowing and control of the Si alloys that are used in the process. In this context, a correlation was made using the equipment's control tool, the spectrometer, between the CO+CO2 curve and the O2 incorporated in the bath. Thus, it was noted that, at the moment when both curves crossed, the target carbon content in the steel was adequate, and it was not necessary to increase the oxidation level of the bath, which, consequently, oxidizes the added Silicon, reducing the its performance and making a greater addition to the league if necessary. With these actions, we managed to meet the target of 80% of races with C within the optimized range (C<0.0023%) and we had a financial gain of KR$560 in the period of January 2022 to December 2022.
