Real‐Time Heat Transfer Model Based on Distributed Thermophysical Property Calculation for the Continuous Casting Process

Abstract

In this work, a one‐dimensional real‐time heat transfer model, which considers the effect of varying thermophysical properties along slab thickness direction caused by the distribution of solute segregation, is built to predict the location of the solidification end of a wide‐thick continuous casting slab accurately. According to the measurement results of carbon segregation on the slab transverse section, a database of thermophysical properties with different carbon contents is established based on the micro‐segregation model. At the beginning of the calculation, the pre‐calculated thermophysical properties of the target slab are pre‐loaded to random access memory (RAM), and the corresponding physical parameter data are called from RAM to complete the calculation process according to the pre‐measured carbon concentration at different slab thicknesses. Additionally, the solidification relationship between the slab center and other positions along the width direction is derived based on an offline two‐dimensional heat transfer model. With calling the relationship, the whole slab uneven solidification process can be described based on the real‐time calculated results of the slab centerline solidification process. The real‐time heat transfer model is validated by measuring the slab thickness and surface temperature.

Digital-Twin-Based Coordinated Optimal Control for Steel Continuous Casting Process

“…For example, when the casting sp ingly and suddenly, water flows will increase immediately, accordin process, the response of the water flow is much faster than that of t there will be a valley appearing in the integral temperature respons verse will happen. (2) There are obvious delays between immediate flows.…”

“…For optimal control of secondary cooling and final electromagnetic stirring, the heat transfer model is fundamental to calculate the solidification states inside and outside. In recent years, much research has been carried out well into the heat transfer model [2][3][4][5][6][7]. Among these studies, most of the developed models are two-dimensional [8] or three dimensional but offline [9], and the steady models are applied to optimize the process parameters [10,11], while real-time transient ones are used for online dynamic control [12,13].…”

The Investigation of Phase Transition and Solute Transport for Bloom Continuous Casting with Steel Strip‐Feeding Process and Mold Electromagnetic Stirring: A Comparative Study

“…The boundary conditions for heat transfer are divided into the mold and secondary cooling. For heat transfer boundary conditions, the relevant work has been described in detail in the work of Ji et al [ 39 ] By using a 1D direct finite‐difference model, the thermophysical properties of the target steel, such as enthalpy, density, and thermal conductivity, are calculated in detail by the present authors’ previous work. [ 11 ]…”

3D Transient Heat Transfer Simulation and Optimization for Initial Stage of Steel Continuous Casting Process

“…In the recent years, many numerical heat transfer models for continuous casting products have been developed. However, most of them are either one dimensional [11][12][13] or two dimensional [14][15][16][17][18] , and they are not valid for online application due to lack of accuracy or efficiency, these models are developed just for caster design, operating parameters optimization and can only simulate casting conditions offline 15,[19][20][21][22] . The low-dimensional models cannot deal with transient situations especially the initial and final casting stages, when the heat transfer in the casting direction is so obvious that it cannot be ignored and the model should be considered as three dimensional essentially.…”