Novo Projeto De Liga Para a Redução Na Variação Do Nível De Aço No Molde De Aços Hsla Peritéticos Produzidos Para a Laminação De Tiras a Quente Conforme a Norma Abnt-NBR 6656 Lne380

Abstract

NBR6656 LNE380, perictetic steels, with carbon content between 0,08% and 0,12% presented high Mold Level Fluctuation (MLF), thus generating great casting process instability beyond higher Break-Out occurrence probability and surface cracks on the slabs. The strategy that was chosen on this work is based on the modification of the Alloy Design in order to avoid the perictetic range. In previous works 1 the strategy was to increase the carbon content. For this work the strategy was to decrease the carbon content, due to the technical specifications restrictions, using other equations to the correct determination of C δ , C γ e C líq. In this paper will be discussed the countermeasures adopted to control the MLF, based on the alloy design, by the use of regression equations that take in account the effect of diverse alloying elements on the perictetic range. The impact of the new alloy on the mechanical properties will be evaluated and the statistical capability obtained for both the alloy design related to MLF.