FEATURES OF THE TECHNOLOGY OF MELTING AND DEOXIDATION OF MANGANESE STEEL

Abstract

Manganese steel can be classified as TRIP steel and TWIP steel depending on the mode of deformation mechanisms. TRIP steels can withstand high loads without deformation, while TWIP steels deform easily under low loads and do not break up to a total deformation of 90%. This means that the steel retains good ductility even after the deep drawing process. The slag regime of the steelmaking process significantly affects the mechanical properties of manganese steel, especially the impact toughness. Working with slag is reduced to obtaining its basicity and oxidation, as well as the concentrations of basic oxides, required by the technological instructions. It is known that to obtain the highest values of mechanical properties of steel, it is necessary that the residual aluminum content in the metal does not exceed 0,04%. When introducing the same amount of aluminum for deoxidation (1.2 kg per 1 ton of liquid metal), the concentration of aluminum in the metal varies from 0,01% to 0,09% due to fluctuations in the oxidation of the metal. It is possible to reduce the oxidation of the metal by diffusion deoxidation of the slag of the reduction period.