Effect of Supporting Roll Setting on the Inner Structure of Cc Slabs

Abstract

Mathematical model was developed to estimate the flow rate and direction and of the expected porosity level in the centre part of a slab. Calculations show that centreline segregation is basically affected, at a given composition and cooling technology by the setting, deformation and eccentricity of the supporting rolls. Bulging of the strand between the supporting rolls can also play role.

Mushy szerkezet permeabilitásának számítása

“…Az olvadékáramlást fenntartó ferrosztatikus nyomás csökkenésének mértéke és üteme kulcsszerepet játszik a porozitás kialakulásában. A kérdéskör vizsgálatához a szál belsejében kialakuló térfogati viszonyok ismerete szükséges, ez a Liquid Motion Intensity (LMI) modell segítségével meghatározható [1,2]. Az LMI modell középvonali dúsulás becslésére való alkalmasságát a korábbi kutatások bizonyították [3,4].…”

Control of Centerline Segregation in Slab Casting

“…The amount of melt moving between the slices can be summarized along the whole strand or along the mushy area and from this the amount of melt flow and the rate of the flow can be defined. A detailed description of the model principles and of the simplifications applied can be found in earlier publications [1][2][3][4] . The following deformations of the strand can be taken into account in the model: …”

“…), and deformations of the strand (settings of the supporting rolls, bulging) must be taken into account. The volumetric flow rate can be calculated by the Liquid Motion Intensity (LMI) [1][2][3][4] model, taking into consideration also all the above mentioned and important deformation effects.…”

“…The Liquid Motion Intensity [1][2][3][4] (LMI) 2D model is used for the calculation of volume changes inside the strand under steady and non-steady casting conditions within the longitudinal cross section of the slab. The main task of the model is to define volumetric flow rate function (Q) inside the strand, taking into account the effect of chemical composition of the steel, the steel casting technology and the casting machine parameters as well.…”

“…In order to investigate porosity formation, it is necessary to learn about the volume changes inside the strand. The Liquid Motion Intensity (LMI) model provides these kind of data 1,2) . The suitability of the LMI model for the estimation of centerline segregation level has been demonstrated in previous research 3,4) .…”