Models for the Formation of Flatness Defects of Steel Strip during Its Rolling and Heat Treatment

The article presents some known methods for assessing the type and amplitude of flatness defects of steel strips and analyzes models of flatness defects in these strips after their rolling and heat treatment. These models can be conditionally divided into four groups. The first group of such models allows one to estimate the presence of flatness defect by the difference in the elongation coefficients across the width of the strip. The models of the second group are based on the possibility of determining the best shape of the cross section of the strip. The models of the third group relate the causes of the loss of strip flatness to the technology of cooling the steel strip after rolling. In the fourth group of models, the main cause of the loss of strip flatness is indicated to be the parameters of the working and support rolls.