Of Some Mechanical Characteristics for a Steel Used in Constructions of Conduits for Steam Transfer

Résumé

The metallographic analysis [4], revealed that the initial ferrite-pearlite structure of the steel under study shows slight tendencies for coalescence, decarburation and carbide precipitation. The precipitating carbides maintained their globular shape being located on the grain boundaries. Due to the metallurgical degradation, the mechanical degradation occurs as a consequence of both cavities and microcracks formation processes. Based on the values determined for the mechanical characteristics of the pipe under study it has been concluded that the material is suitable for continuing the service and has marked resistance reserves. These reserves have been explained by the absence of the marked processes of grain boundary decarburation and the carbide network formation.