Posouzení vlivu řízeného ochlazování na konečné vlastnosti vysokopevnostních řetězů

Abstract

The theme of this work is to evaluate the impact of controlled cooling on the final properties of high-strength chains. The objective is to determine whether the controlled cooling affects the mechanical properties of steel bars and subsequently produced chains with strength class 10. There are described the directives PAS 1061 in the theoretical part and also production of high-strength chains. Moreover it is indicated the composition of 23MnNiMoCr54 steel and the impact of stated chemical elements on its properties. There is also the description of the Continuous light section mill in TŢ, in which the bars for chains were rolled. The materials for chains were controlled rolled and cooled either freely or controlled (accelerated or decelerated). Then on taken samples there were examined the mechanical properties of rolled bars and chains already produced. Each technology of production is evaluated on the results of those tests. The results of these tests are yield stress, ultimate stress, tension, contraction and impact energy. Within the experiment it was also measured the temperature of cooled material using thermovision.