CALCULATION OF THE DEGREE OF BLACKNESS OF METALLIC MELTS BASED ON THE DATA OF TECHNOLOGICAL CONTROL OF TEMPERATURE AND TIME DURING THE MELTING OF STRUCTURAL STEEL GRADES

The article presents the results of calculating the emissivity of iron-carbon melts - semi-finished products formed in steel-smelting units: a converter and an electric arc furnace for further production of carbon structural steel grades. The calculation is based on the model of melt cooling due to radiation. Large samples were used for the calculation. The samples were extracted from the aggregate data of systematic measurements of the melt time and temperature in the technological cycle of steel smelting. It is shown that in the temperature range of 1560-1700 °C, the emissivity value lies in the range from 0.01 to 0.058. The dependence of the emissivity on temperature is of an activation nature and is satisfactorily described by the obtained exponential approximation.