Estudo da ductilidade a quente de vergalhões laminados sem uso da etapa de reaquecimento

Abstract

In the hot rolling process occasionally occurs the hot shortness which can cause the phenomenon referred to as split ends of bar during the sequence of roll ing pass. This hot shortness can be severe and cause disruptions in the production process. This phenomenon may be associated wit h several factors, such as: chemical composit ion of steel; defects present on billet; conditions of rolling process ; and steel temperature during the proc ess, especially at the roughing and intermediate passpasses of rolling. In the proce ss under study, hot shortness occurs associated with the rolling of rebars from billets coming directly from continuous casting casting. The present work has as objective to evaluate the influence of the temperature and the microstructure formed along of process i in hot shortness of bars through comparative examination between the rolled rebars with and without the use of reheating step.