Reference Yield Strength Calculated by Rolling Force Model

Abstract

Rolling force model is very important during the rolling process. The accuracy of the model not only affect the formulation of rolling process, the equipment designing, but also involve with the thickness precision of the product. SIMS formula is adopted to establish the rolling force model. The parameters of the model are obtained by using the fitting method[l]. After that, the factors of the formula affected the rolling force are analyzed, the result shows that the steel rolling temperature is the key influence factors of rolling force, and it indicates that the key factor of the stability of rolling process is temperature.

By the same time, the reference yield stress of different steel grades are calculated by using the regression method. The pipeline steel economical X90, deep seabed pipeline X70Mo, High-rise building steel Q420GJC, Bridge plate Q420qE, Ship plate EQ51, Saw steel 50Mn2V, High strength steel A514Gr.S is respectively calculated. The results indicate that no obvious difference about reference yield stress of each steel grade in the condition of high temperature. It suggests that the value of rolling foce is not very closely related with the steel grade when large reduction is taken at the stage of rough rolling, the main influence factor of the rolling force is temperature factor.