Vliv doválcovacích podmínek na vlastnosti tlustých ocelových plechů

Abstract

The bachelor thesis deals with the influence of the rolling temperature on the mechanical properties and structure of plates during the normalization rolling of plate grades S355J2 + N. Within the work, an experiment was performed to simulate the last phase of rolling from a thickness of 80 mm to a final thickness of 40 mm at different finishing temperatures. The observed parameters were yield strength, tensile strength and ductility according to the ČSN EN 10025-2 standard. Furthermore, the hardness, microstructure, size of the ferritic grain and the proportion of ferrite - perlite were evaluated. The main purpose of the work was to determine the effect of rolling temperatures on the properties of thick plates, especially yield strength, yield strength and ductility to ensure a sufficient reserve of these properties compared to the above-mentioned standard in the production process at the four-high rolling mill 3,5m in Vítkovice Steel, a.s.