Practical Use of Computer Model STAN 2000 for Improvement and Creation of Regimes for Hot Rolling of Steels on SEVERSTAL Mill 2000

Abstract

An integral computer model STAN 2000 designed for of-line simulation and control of hot rolling on mill 2000 of SEVERSTAL was developed. The capabilities of the model include the following features: ‒ calculations of power parameters for all stands of mill 2000 for a given rolling schedule; ‒ strip temperature calculations depending on selected rolling and accelerated cooling regimes; ‒ follow-up of steel microstructure evolution at all stages of strip production and prediction of ultimate mechanical properties (yield stress, ultimate tensile stress, relative elongation and toughness); ‒ optimization of rolling regimes for existing steel grades and developing them for a new one. The STAN 2000 program is written in С++ programming language and can work on all modern Microsoft Windows family operating systems. The program has a well-designed and user-friendly interface facilitating its practical use. The integral model was calibrated using an extensive data base on rolling regimes and forces, measured temperatures and final mechanical properties for a number of steel grades rolled on mill 2000 of SEVERSTAL with chemical compositions covering the following range of alloying elements content (mass.%): С(≤0.65); Mn(≤2.0); Si(≤1.0); Cr(≤0.9); Ni(≤0.6); Cu(≤0.5); Mo(≤0.4); Nb(≤0.05); V(≤0.065); Ti(≤0.06); B(≤0.003). The examples of STAN 2000 program use in practice of industrial hot strip production on mill 2000 of SEVERSTAL are presented and discussed.

Adjustment of the Hot Rolling Technology of Micro-Alloyed Pipe Steel Using a Digital Twin to Provide the Targeted Structure and Properties of the Metal

“…The technology of rolling on a continuous rolling mill 2000 (Severstal) (Fig. 1) has a digital twin "Stan 2000" [10,11], which with a sufficiently high accuracy allows calculating the thermal conditions of rolling, power parameters, formation of the austenite structure during rolling, taking into account the proportion of carbonitrides released, as well as changes in the structure during phase transformations, the final parameters of the structure and the mechanical properties of rolled products for a wide range of chemical compositions. Stan 2000 includes 4 reheating furnaces, then a roughing group consisting of 5 stands, 3 of which works as tandem.…”

Formulas for the Calculation of Temperatures and Concentrations of Carbon Responsible to the Parar Equilibrium of the Main Phases in Medium Sheet Steels

“…In recent years, in the practice of modern industrial production of hot-rolled steel sheet, quantitative integral mathematical models ("through" models) of hot rolling [1][2][3][4][5][6], capable of predicting the final microstructure of steel and its mechanical properties, find effective use. The use of such models allows you to optimize rolling conditions and chemical compositions of existing steels, as well as develop new steels and their rolling conditions with minimal expenditure of material and time resources, thus providing a significant economic effect.…”