Effect of bottom stirring on basic oxygen steelmaking

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2016
Bilgiç, Çağrı Doğan
ERDEMİR Steel Plant produces wide range of alloy steel for various industries. Main demand of industries for steel is high quality end product with lower prices. One of the criterion affecting not only the steel cleanliness and also price of the product is bottom stirring in basic oxygen steelmaking. The objective of this study is to investigate effects of bottom stirring on basic oxygen steelmaking. With this objective, process parameters, analysis of produced heats were investigated to determine effects of stirring and optimum stirring program. For the current study, overall and individual analyses carried out using the turndown slag, the metal composition and the input materials data for many heats in terms of the amounts of oxygen, carbon, manganese, nitrogen, sulphur, and phosphorus at the end of blow. The results indicated the advantages of bottom stirring since it enables the steel production with lower amounts of oxygen, carbon, sulphur and phosphorus while it makes high manganese containing steel production possible. Additionally, by the help of bottom stirring higher iron yield is possible. The efficient removal of impurities comes along with a cleaner and high quality end product. Moreover, it is possible to have economic savings due to low requirements of deoxidizer and ferromanganese during the production.