Technology for Complex Deoxidation of Steel with Silicon Carbide and Calcium Carbide in Order to Obtain Steel with Low Nonmetallic Inclusion and Oxygen Contents

Advantages and disadvantages of deoxidizing steel with silicon carbide and calcium carbide are considered. The advantage is demonstrated of joint diffusion deoxidization technology for steel with silicon carbide and calcium carbide. Use of classical technology of metal deoxidation with aluminum leads in a number of cases to the appearance of individual alumina inclusions of the reject type with general high purity of steel with respect to non-metallic inclusions. Inclusions are exogenous in nature, and their origin is presumably entry of alumina growths from the CBCM submerged nozzle. The technology of diffusion deoxidation of metal during ladle treatment with combined use of silicon carbide and calcium carbide makes it possible to exclude entry into steel of large alumina inclusions. Types, composition, sizes and distribution of nonmetallic inclusions in cast metal produced by this technology are investigated. Use of diffusion deoxidation with silicon carbide and calcium carbide makes it possible to form fine globular non-metallic inclusions, predominantly small calcium aluminosilicate, and manganese and calcium sulfides.