Si-C alloy is a new alloy of alloys for converters. It can replace ferrosilicon, silicon carbide and carbon reductant, reduce the amount of deoxidizer, and be used in converter smelting deoxidation alloying process. The effect is stable, chemical composition and mechanical properties of steel. The internal control quality is superior to the traditional process. Its characteristics: improve the quality of molten steel, improve product quality, improve product new energy, reduce the amount of alloy added, reduce steelmaking costs, and increase economic efficiency.