Section Mill of Laiwu Iron and Steel Company Ltd

Laiwu, China

Section Mill of Laiwu Iron and Steel Company Ltd

Laiwu, China

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Guan B.,University of Science and Technology Beijing | Zang Y.,University of Science and Technology Beijing | Pang X.-N.,Section Mill of Laiwu Iron and Steel Company Ltd | Lu Z.-Y.,Section Mill of Laiwu Iron and Steel Company Ltd | And 2 more authors.
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2012

In order to control the residual stress of H-beam during the straightening process effectively, the mechanical mechanism behind the evolution of residual stress was studied during the straightening process. The elastic-plastic bending process of H-beam section with initial residual stress was considered analytically based on the elastoplastic bending theory. The way that the initial residual stress affects the elastic-plastic bending process was demonstrated, and it is also proved that initial residual stress of the section leads to the asymmetric bending of the displacement of the section neutral axis. On the basis of the analysis, a difference method was established to describe the continuous bending process of H-beam during the straightening process. The evolution mechanisms of H-beam residual stress during the straightening process was studied. The results show that the asymmetric elastic-plastic bending process at the earlier stage of straightening process is the main reason for reducing the tension-compression stress state of the web and flange, while the symmetrical bending process in later stage of the straightening process further improves the residual stress state of the flange. The different elastoplastic bending properties during the early and later stage of the straightening process play different roles in the evolution of residual stresses during the straightening process.


Guan B.,University of Science and Technology Beijing | Zang Y.,University of Science and Technology Beijing | Pang X.-N.,Section Mill of Laiwu Iron and Steel Co. | Lu Z.-Y.,Section Mill of Laiwu Iron and Steel Co. | Qu W.-Z.,Section Mill of Laiwu Iron and Steel Co.
Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | Year: 2012

In order to study the bending behavior of the section during roller leveling process, the bending process of the section which contains the history of elastic-plastic bending process was investigated. With the basic theory of elastic-plastic mechanics, a reasonable mechanical model of complicated bending process of the section was built. With this model it is proved that the stress in the section coming from the second recurvate process must be described by the coordinate plane constituted by two bending parameters, and the M-C relation of the section coming from the second recurvate process is actually a complicated function which contains two bending parameters. By analyzing stress distribution and reverse bending behavior of the section coming from the second recurvate process, it is proved that the stress distribution and reverse bending behavior of the elastic-plastic bending section, affected by several times of deformation during roller leveling process, are no longer a simple one, but a complicated function which contains all the historical parameters of bending. Analytical results show that during the second recurvate process, there are decreased elastic limit bending moment, reduced bending moment and increased springback ratio. Therefore related parameters should be adjusted accordingly in terms of engineering application.

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