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Low iron calcium silicon

Date: 03-23-2021
 Low iron silicon calcium alloy referred to as silicon calcium alloy, belongs to the category of ferroalloy, its main composition is silicon and calcium, but also contains different quantities of iron, aluminum, carbon, sulfur and other impurities.Other impurities are specified for different purposes.In addition, on the basis of silicon calcium alloy, other elements are added to form ternary or multivariate composite alloy.Such as Si - Ca - Al;Si - Ca - Mn;Si-Ca-Ba, etc., used as deoxidizer, desulfurizer, denitrification agent and alloy agent in iron and steel metallurgy.


Because calcium has a strong affinity with oxygen, sulfur, hydrogen, nitrogen and carbon in molten steel, silicon calcium alloy is mainly used for deoxidizing, degassing and fixing sulfur in molten steel.A strong exothermic effect is produced when silicon and calcium are added to molten steel.Calcium turns into calcium vapor in molten steel, which has stirring effect on molten steel and is favorable to the floating of non-metallic inclusions.After deoxygenation, non-metallic inclusions with larger particles are produced, which are easy to float up, and the shape and properties of non-metallic inclusions are also changed.Therefore, the silicon calcium alloy is used to produce clean steel, ****** steel with low oxygen and sulfur content, as well as special performance steel with low oxygen and sulfur content.Add the calcium silicon alloy can eliminate as final deoxidizer in aluminum steel in the ladle nozzle nodules, and continuous cast steel | ironmaking of tundish nozzle clogging and so on.In the out-of-furnace refining technology of steel, the content of oxygen and sulfur in the steel is reduced to a very low level by deoxidizing and desulphurizing with silicon calcium powder or core wire.It can also control the form of sulfide in steel and improve the utilization rate of calcium.In the production of cast iron, Si-Ca alloy not only plays a role in deoxygenation and purification, but also plays a role in inoculation, which helps to form fine or spherical graphite.The distribution of graphite in gray cast iron is uniform, and the tendency of white casting is reduced.And can increase silicon, desulfurization, improve the quality of cast iron.

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