Study of a forecasting possibility of high carbon wire rods quality at production of them at a wire rod mill

Abstract

The choice of technological parameters of high carbon wire rods production process determines the values of mechanical properties and quality indices. Variations of technological parameters of rolling process and steel chemical composition predetermine considerable dispersion of mechanical characteristics values and quality indices of high carbon wire rods: tensile strength, percent elongation, reduction of area and microstructure. Stabilization of obtained mechanical characteristics values and quality indices during wire rods production was the main task of the study. During the work execution statistical methods of experiment data processing with application of regression analysis methods. Equations for carbon equivalent value determining were elaborated and applied. Regression dependences of quality indices change on the steel chemical composition and the rolling process technological factors plotted, which allow to forecast their values and effective correct the wire rods rolling regimes. General tendencies of the quality indices change, simulated by the obtained regression equations, correlate with industrial data. At the confidence probability of 95%, all the obtained equations of wire rods quality indices interrelation with technological factors of their production are statistically significant. Error of the obtained regression dependences is in the range of 4–11%. Results of the study allow recommending application of those mathematical dependences for a model elaboration, capable of finished products required properties forecasting. When it is necessary to change the regulation level of quality indices, application of obtained mathematical dependences will allow to make corrections on the value range of the wire rods rolling process technological parameters. Forecasting of quality indices values and effective correction of wire rods rolling regimes increase reproducibility stability of mechanical characteristics and wire rods quality indices.