Based on works rolling process of 4300 mm medium-heavy plate of low carbon steel Q235 (C ≤0. 20% ) the elastic-plastic finite element model is established by using the finite element software ABAQUS/Explicit to simulate and calculate the general rolling process and MAS (Mizushima automatic plan view pattern control system) rolling process for medium-heavy plate with spread ratio 1. 70 and finishing rolling elongation 7. 87

and the comparative analysis on different deformation stages is carried out. Results show that the plane shape of rolled medium-heavy plate is obviously improved by using MAS rolling method

its changed value in shape is directly related to the setting parameters at MAS rolling stage

and the MAS rolling optimum parameter i. e. △L×△h= 300 x3 is obtained by comparing the rolling results using different MAS parameters.