Ferrosilicon, in layman's terms, is an ferro alloy composed of silicon and iron. It is a ferrosilicon alloy that is smelted in an electric furnace using steel scraps, coke, and quartz as raw materials.
Ferrosilicon is divided into four categories according to the smelting method: high silicon ferrosilicon, ordinary ferrosilicon, low aluminum ferrosilicon and high purity ferrosilicon. High-purity ferrosilicon refers to ferrosilicon with low impurity element content produced by refining outside the furnace.
High silicon ferrosilicon: ferrosilicon with a silicon content of more than 87%.
Ordinary ferrosilicon: the most widely used ones are 72# ferrosilicon, 75# ferrosilicon, 65# ferrosilicon, and other impurity content in the alloy generally does not require too many ferrosilicon.
Low aluminum ferrosilicon: In ferrosilicon alloy, an alloy made by adding a certain amount of aluminum element is also called a silicon-aluminum ferrosilicon alloy, and the aluminum content needs to be marked. For example, the brand name is DL FeSi75Al0.8, which means low aluminum ferrosilicon with an aluminum content of 0.8%.
High-purity ferrosilicon: A ferrosilicon alloy with Si and Fe as effective elements and very low content of other impurities. It has very high requirements. The controllable range of its impurity content is C0.05-0.003%, S0.01-0.002%, P<0.02%, V0.05-0.001%, B0.01-0.002%, Mn<0.10%, Mg0.05-0.005 %, Ti0.05-0.007%, Ca0.05-0.002%, Ca＜0.05%, Cr＜0.05%, Ni＜0.05, Zr0.01-0.003, Al＜0.1%, the total of other impurities is less than 0.05%
Ferrosilicon is an indispensable deoxidizer in the steelmaking industry;
High-silicon ferrosilicon or siliceous alloys are used in the ferroalloy industry as reducing agents for the production of low-carbon alloys;
In the foundry industry, adding ferrosilicon to molten iron can prevent iron from forming carbides, promote graphite precipitation and spheroidization, and act as an inoculant and spheroidizing agent.
When ferrosilicon is used as a deoxidizer in steelmaking, oxygen and silicon react extremely easily to synthesize silica and release increased heat energy at the same time, so it is also very beneficial for increasing the temperature of molten steel.
