Controlled Residual Stress Research of H-Beam

Abstract

Because of the residual stress of H-beam after hot rolling, the service performance of H-beam is seriously impacted. it is necessary to reduce the residual stress by controlled rolling and cooling process. In this paper, a continuous rolling model of finish product of H200 x 200 x 8 x 12 is set up. The continuous rolling process of H-beam was simulated using the large finite element software ANSYS/LS-DYNA. The effect of non-uniform elongation of web with flange and section temperature difference on the residual stress are analyzed. Through metallographic observations, the vary microstructure of rolling piece with residual stress and with no residual stress is analyzed. As can be seen from the finite element analysis and the experimental results, reasonable elongation of flange and web and controlling cooling speed to decrease the sectional temperature difference can reduce the residual stress of H-beam.