Silicon-calcium alloy is a composite alloy composed of elemental silicon, calcium and iron. It is an ideal composite deoxidizer and desulfurizer. Silicon alloy not only has strong deoxidizing ability, the deoxidized products are easy to float and discharge, but also can improve the performance of steel, improve the plasticity, impact toughness and fluidity of steel. At present, silicon-calcium alloy can replace aluminum for final deoxidation, and is widely used in the production of high-quality steel, low-carbon steel, stainless steel and other steel types and nickel-based alloys, titanium-based alloys and other special alloys; and is suitable for converter steel workshop Warming agent; can also be used as an inoculant for cast iron and an additive in the production of ductile iron.