Estudo dos processos de amaciamento no laminador contínuo da V&M do Brasil

Abstract

The seamless pipe rolling presents the oil piping segment as one of its main markets. The oil and natural gas extraction occurs, in great part, in corrosive environments that requires the use of products that present more resistance against CO2 corrosion, such as DINX20Cr13. The rolling problems seem in this steel grade, such as the waves present at the edge of the pipe that are not found on carbon-steel, show the need to achieve a greater knowledge about its softening process and metallurgical features throughout the rolling process. In this study the Conti mill parameters were simulated using finite element and compared with standards calculation procedures. The obtained results showed that it is possible to simulate the Conti mill using finite elements within an acceptable error. The softening process were simulated mathematically for the DINX20Cr13 and Grade B and was observed that the softening mechanisms, the softening kinetics and microstructure throughout the Conti mill process present considerable discrepancy between the steel grades, although this is not the reason of the wave appearance on the pipe edges. The present study suggests still that in the future the wall thickness deviation should be studied in each stand of the conti mill, as the waves probably have mechanical causes, and not metallurgical