Calculation of metal resistance against plastic deformation accounting its softening during continuous rolling

The value of metal resistance against plastic deformation is an important parameter at designing of technological equipment and plastic deformation modes, since it determines considerably energy and power parameters during rolling process. Usually it is represented as dependence on deformation rate, value of accumulated deformation and temperature at which the deformation takes place. Application of such dependences usually gives a satisfactory coincidence with experimental data. However, the perfection of the rolling processes results in increase requirements to the calculation accuracy of the deformation parameters, including the value of metal resistance against plastic deformation. At the production of metal products and pipes, the processes in which a metal is subjected to multiple deformation, are widely used. One of the ways to increase the calculation accuracy of the value of metal resistance against deformation is the accounting of metal softening between their stages. Calculation of variation of the metal resistance value presented, accounting and without accounting the softening during pipes rolling at a mandrel in a four-stand continuous mill. It was shown that the softening could have a significant influence on the value of metal resistance against plastic deformation. Accounting the softening and various processes taking place along both the roller pass perimeter and the mill length, gives an actual picture of stress and deformation state of metal.