Speaker
Description
Ingot size and shape, porosity, segregation and CET (columnar to equiaxial transition) zone position in steel ingots have significant influence on the quality of final product and are the main reasons why the ingot manufacturers need the right tools to choose the technology parameters to get a cost effective product and improve the internal quality of the ingots.
The goal of this work was to describe the models employed to design the ingot shape, asses segregation, porosity and CET zone in steel ingots, models that may help to take decisions during the technology improvement.
The ingot and mould design module uses minimal input data (ingot and hot top weight, height and medium diameter ratio, ingot taper, number of sides, etc) to generate in several minutes 2D drawings and 3D files of the whole mould assembly project for round, rectangular, corrugated or hollow ingots.
To predict the segregation, a model that takes into account the chemical composition and cooling conditions of the ingot has been used. The results we got by simulation have been compared to sulphur print of a cut ingot.
To asses the porosity, the Niyama criteria has been used, a method that gives good results in steel ingot manufacturing practice. To calibrate the model and get the Niyama constant value, a 8T cut ingot has been used.
The CET prediction technique implemented is based on Hunt criteria. To calibrate the model and get the constant parameters, experimental data have been used.
Several examples will show how to use the proposed models in optimization of the ingot chemistry, pouring variables, ingot mould projects or choosing the right ingot size and shape for a particular steel.
| Speaker Company/University | Ovidiu Bogdan / Industrial Soft |
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