Abstract
The results of a study of the dependence of the chemical composition of low-carbon pipe steels on the rate of advancement of the solid phase are presented. Modelling of solidification by virtue of the Poligon Soft software package of four chemical compositions of steels in a Ø410 mm copper chill mold having the geometric parameters of the mold core of the primary cooling zone of a continuous casting plant are shown. The temperature field and the thickness of the solid phase of the castings were estimated at specific time intervals of up to 320 sec, which corresponded to the average residence time of liquid steel in a copper crystallizer during the continuous casting of steels. An assessment of the temperature fields showed that increasing the carbon content in steel at the initial time, the surface temperature of the castings near the walls of the copper chill mold decreases. The decrease reaches up to 13 ° with increasing carbon from 0.07 to 0.20% in steel. In addition, studies have shown some differences in the nature of the promotion of the solid phase. It was established that steels have different solidification rates due to the chemical composition. Steels with the lowest carbon content have the highest rate of advancement of the solid phase. Moreover, their solidification rate is comparable. Steel with the highest carbon content has the lowest solidification rate.
Keywords
Crystallization, solidification, solid phase modeling, low carbon steels, two-phase zone.