Custos médios e marginais da Placa ComercialBelo Horizonte2016

Abstract

In recent years, the steel industry has suffered from a recent economic downturnand the increase in the importation of foreign of steel products. In a continued scenariowith a reduction of profit margins, it is crucial to understand the average and marginal slabcost to inform decision making in hiring business consultants.Usiminas already has a marginal cost model that covers ironmaking andsteelmaking, whose answer is the marginal cost of commercial slab. In this study, it wasevaluated the impacts of scrap steel consumption in metallic yield and in consumption ofother refrigerants materials (sinter and scale) in the converter in order to include them inthe model.A direct correlation between percentage of scrap and metallic yield in the Ipatingasteelworks was observed, which is in agreement with the literature, since the greater theproportion of scrap in the metallic burden of the converter (iron content greater than thehot metal), greater metallic yield. The correlation obtained in this case was 67.62%. Withthe inclusion of the impact in the model for scrap percentages of less than 14.0%, there wasnot much difference in the average cost and the marginal cost of slab with and withoutimpact on metallic yield. However, in the percentages up to 14.0% in metallic burden,there was a difference of 3 R$/ton and 2 R$/ton in the average cost and marginal cost ofthe slab, respectively, when compared with the costs without metallic yield impacting.Consumption of other obtained refrigerant materials (including sinter and scale)were not correlated with scrap consumption. In addition to others refrigerants materialsconsumption in the converter, other factors affect the thermal balance, for example,temperature and quality of hot metal, the addition of alloys, the use of limestone, amongothers.