Establishment of optimal technological regimes of out-of-furnace processing of low-alloyed steels in order to ensure their high corrosion resistance in aqueous media through the formation of favorable non-metallic inclusions

Abstract

Based on the analysis of the technological principles of managing the formation of nonmetallic inclusions and the results of additional studies, optimal process conditions for out-of-furnace processing of steel were established, ensuring not only low contamination of nonmetallic inclusions (HB), but also the formation of nonmetallic inclusions of a favorable morphology that do not adversely affect the corrosion resistance of steel. It is shown that this is achieved by regulated input of aluminum for deoxidation and alloying of steel, limiting its content in steel, limiting the input temperature of aluminum and calcium at the final processing stage, as well as the duration of the flushing period. For steel, micro-alloyed with titanium, it is also possible to form another type of HB, which also do not adversely affect the corrosion resistance of steel. The oxide component of such HB with a high content of calcium and titanium acquires a rounded shape. The formation of such HB is achieved by the regulated input of aluminum, titanium and calcium at the final stage of processing.