Deoxy: deoxygenation reaction to the molten steel bath or adding deoxidizer, Shandong composite silicon carbide deoxidizer, deoxygenated product into the slag or into a gas discharge operation. Deoxidation: precipitation deoxidation, deoxidation diffusion, vacuum deoxidation, precipitation deoxidation: the block deoxidizer directly into molten steel, silicon carbide composite deoxidizer Wuhan, deoxidizing element in molten steel inside the reaction with oxygen in the steel, resulting deoxygenated product floating into the slag deoxidation method. Advantages: deoxy more efficient, silicon carbide composite deoxidizer, simple, less time consuming, less alloy consumption, low cost; Disadvantages: easy to remain in the steel deoxidation product will cause endogenous inclusions. The purpose of steelmaking slag: a removal of harmful elements steel S, P; b steelmaking slag covering the molten steel surface, but the degree of oxidation protection of molten steel, non-absorbing harmful gases, heat, reduce beneficial elements burning. ; c inclusions and the reaction product was adsorbed floating;.. d ensure the smooth progress of the reaction of carbon and oxygen;