Analysis of the Process of Electrical Steel Production

Abstract

The technology of melting and secondary processing of electrical silicon steel and the changes in the content of oxide nonmetallic inclusions (NIs) in the metal at the stages of its secondary processing and casting is analyzed. Fractional gas analysis and scanning electron microscopy with electron-probe microanalysis are used to study samples of three heats taken at the stages of secondary processing and casting of electrical silicon steel. The total oxygen and nitrogen content and the amount and the main types of oxide NIs (silicates, aluminosilicates, spinels) in the samples are determined. The increase in the amount of spinel NIs in the metal samples is assumed to be related to the influence of deoxidizers, and the increase in the oxygen and nitrogen content in the samples taken in a steel degassing plant and in a tundish during heat I can indicate the influence of secondary oxidation at these processing stages. Commercial heat logs are analyzed and thermodynamic calculations are performed in order to determine the factors affecting the destruction intensity of the steel-teeming ladle lining and the increase in the content of NIs and carbon in the metal samples.