The Role Of Calcium Silicon Alloy

Silicon-calcium alloy is a silicon-calcium alloy obtained from silica, lime and coke in a strong reducing atmosphere at 1500-1800 degrees. Its main components are silicon and calcium, and it also contains impurities such as iron, aluminum, carbon, sulfur and phosphorus in varying amounts. In the iron and steel industry, it is used as a calcium additive, deoxidizer, desulfurizer and denaturant for non-metallic inclusions. It is used as an inoculant and denaturant in the cast iron industry. Calcium silicon produces a strong exothermic effect when added to molten steel. Calcium turns into calcium vapor in molten steel, which has a stirring effect on molten steel and is beneficial to the floating of non-metallic inclusions. After the silicon-calcium alloy is deoxidized, non-metallic inclusions with larger particles and easy to float are produced, and the shape and properties of non-metallic inclusions are also changed. Therefore, silicon-calcium alloy is used to produce clean steel, steel with low oxygen and sulfur content, and special performance steel with extremely low oxygen and sulfur content. In the production of cast iron, in addition to deoxidation and purification, silicon-calcium alloy also plays an inoculating role, which helps to form fine-grained or spherical graphite; makes the graphite in gray cast iron evenly distributed, reduces the tendency of whitening; and can increase silicon and desulfurize , Improve cast iron quality.