Abstract
Modern technology requires ever more high-quality steel and special steels, with properties corresponding to very different purposes. Because of the interdependence of the factors that determine the overall quality of the steel and those who determine the gas content, this is an issue of growing importance for the development, treatment and casting of steel. Slag plays an important part in the development phase no matter the process phase is. The influence of synthetic slags during LF treatment facility is examined based on the degree of removal of hydrogen. After processing the experimental data there has been established the optimal basicity variation on which one can determine the chemical composition of slag (CaO, SiO2, Al2O3, MgO) for the secondary treatment of steel.
Highlights
The properties of a steel depend mostly on a series of agents, including the chemical composition of the steel, nature, mold, distribution and quantity of the non metallic inclusions, gas content, cast temperature, cast speed, degree of plastic deformation and the thermal treatment applied[1].In the case of the semi-finished from steel, one of the causes that leads to worsening their quality is because of the hydrogen content
The hydrogen quantity that is dissolved in steel depends on a series of agents, some of them being[2,3,4] the temperature of the steel, work pressure in the oven and in liquid steel treatment installation, chemical composition of the steel, elaboration and casting procedure etc
Analyzing the dates presented in figures 1 and 2 it results that for the charges that used the burnt additions to compose the reducing slag higher values are obtained for the removed quantity of hydrogen and for the hydrogen removal efficiency as compared to the charges where the same additions were used but not calcined. In both cases there were obtained representative quadratic polynomial correlation equations. It has been seen an increase of the removed quantity of hydrogen and of the hydrogen removal efficiency in the charges with higher content of hydrogen
Summary
In the case of the semi-finished from steel, one of the causes that leads to worsening their quality is because of the hydrogen content. This can be found in steel in an atomic, molecular and other simple combinations state. Having the atomic radius smaller than the steel one, it ranks interstitially and creates a solid solution with the mass basis. It doesn’t make chemical combinations with the iron or other elements that are dissolved into steel. The hydrogen quantity that is dissolved in steel depends on a series of agents, some of them being[2,3,4] the temperature of the steel, work pressure in the oven and in liquid steel treatment installation, chemical composition of the steel, elaboration and casting procedure etc
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