However, Ferrosilicon's carbon content is lower than 0.1﹪, generally 0.05~0.07﹪, what is the reason? The solubility curve of carbon in ferrosilicon with 1187 ℃ is shown in Figure 2. The figure shows that the higher the silicon content in Ferrosilicon, the lower its carbon content. According to the data, the silicon content in Ferrosilicon is about 30 ﹪, the majority of the carbon in Ferrosilicon is in the silicon carbide ﹙SiC﹚ state exists. Silicon carbide is easily oxidized by silica or silicon oxide in the crucible and is reduced. Silicon carbide in Ferrosilicon, especially when the temperature is low, its solubility is very small, easy to precipitate and float. Therefore, the silicon carbide left in Ferrosilicon is very low, so the carbon content of ferrosilicon is very low.